Add acceleration using optional GreenPAK SLG46824

greenpak/SCSI_Accelerator_SLG46824.gp6

@@ -0,0 +1,637 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<GPDProject version="22" oldestCompatibleVersion="22" GPDVersion="6.27.001" lastChange="3.3.2022 14.33">
+    <generalProjectSettings/>
+    <chip family="04" type="06" friendlyName="GreenPAK 6" partNumber="40" package="16">
+        <nvmData registerLenght="2048">0 0 0 0 0 0 8D 30 49 C2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 D2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 30 70 0 30 30 30 30 0 0 30 30 30 0 30 30 30 30 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 14 22 30 C 0 0 0 0 0 0 0 0 0 0 0 D7 0 0 0 0 0 40 0 0 0 0 0 0 0 0 20 0 1 0 0 0 2 1 0 0 2 0 1 0 0 2 1 0 0 2 0 1 0 0 2 1 0 0 2 0 1 0 0 2 0 1 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 A5</nvmData>
+        <checksum crc32="0xE41C926D" version="5"/>
+        <VDDItem id="0">
+            <item id="0" caption="VDD (PIN 20)">
+                <graphics pos="(-590.00,30.00)" angle="0" flipping="0" hidden="0" tOrigin="(20.00,10.00)"/>
+            </item>
+        </VDDItem>
+        <IOPad id="1" useCaseMode="0">
+            <item id="1" caption="PIN 19 (IO0)">
+                <graphics pos="(-590.00,100.00)" angle="0" flipping="0" hidden="0" tOrigin="(20.00,10.00)"/>
+                <textLabel pos="(-19.10,-27.00)" angle="0.00" textColor="#ffff00ff" backgroundColor="#14141464">PLD_IO0 / CLK</textLabel>
+            </item>
+        </IOPad>
+        <IOPad id="2" useCaseMode="1">
+            <item id="2" caption="PIN 18 (IO1)">
+                <graphics pos="(-171.00,277.00)" angle="0" flipping="0" hidden="0" tOrigin="(20.00,10.00)"/>
+                <textLabel pos="(-45.56,-27.00)" angle="0.00" textColor="#ffff00ff" backgroundColor="#14141464">PLD_IO1 / DATA_TOGGLE</textLabel>
+            </item>
+        </IOPad>
+        <IOPad id="3" useCaseMode="1">
+            <item id="3" caption="PIN 17 (IO2)">
+                <graphics pos="(-174.00,502.00)" angle="0" flipping="0" hidden="0" tOrigin="(20.00,10.00)"/>
+                <textLabel pos="(-29.23,-27.00)" angle="0.00" textColor="#ffff00ff" backgroundColor="#14141464">PLD_IO2 / ENABLE</textLabel>
+            </item>
+        </IOPad>
+        <IOPad id="4" useCaseMode="0">
+            <item id="4" caption="PIN 16 (IO3)">
+                <graphics pos="(-590.00,310.00)" angle="0" flipping="1" hidden="0" tOrigin="(20.00,10.00)"/>
+                <textLabel pos="(-4.71,-27.00)" angle="0.00" textColor="#ffff00ff" backgroundColor="#14141464">PLD_IO3</textLabel>
+            </item>
+        </IOPad>
+        <IOPad id="5" useCaseMode="0">
+            <item id="5" caption="PIN 15 (IO4)">
+                <graphics pos="(-590.00,380.00)" angle="0" flipping="0" hidden="0" tOrigin="(20.00,10.00)"/>
+                <textLabel pos="(-4.71,-27.00)" angle="0.00" textColor="#ffff00ff" backgroundColor="#14141464">PLD_IO4</textLabel>
+            </item>
+        </IOPad>
+        <IOPad id="6" useCaseMode="0">
+            <item id="6" caption="PIN 14 (IO5)">
+                <graphics pos="(-595.00,464.00)" angle="0" flipping="0" hidden="0" tOrigin="(20.00,10.00)"/>
+                <textLabel pos="(-4.71,-27.00)" angle="0.00" textColor="#ffff00ff" backgroundColor="#14141464">PLD_IO5</textLabel>
+            </item>
+        </IOPad>
+        <IOPad id="7" useCaseMode="1">
+            <item id="7" caption="PIN 13 (SCL)">
+                <graphics pos="(-764.00,671.00)" angle="0" flipping="0" hidden="0" tOrigin="(20.00,10.00)"/>
+            </item>
+        </IOPad>
+        <IOPad id="8" useCaseMode="1">
+            <item id="8" caption="PIN 12 (SDA)">
+                <graphics pos="(-764.00,701.00)" angle="0" flipping="0" hidden="0" tOrigin="(20.00,10.00)"/>
+            </item>
+        </IOPad>
+        <IOPad id="9" useCaseMode="0">
+            <item id="9" caption="PIN 11 (IO6)">
+                <graphics pos="(149.00,672.00)" angle="270" flipping="2" hidden="0" tOrigin="(20.00,10.00)"/>
+            </item>
+        </IOPad>
+        <item id="10" caption="GND (PIN 10)">
+            <graphics pos="(770.00,380.00)" angle="0" flipping="1" hidden="0" tOrigin="(20.00,10.00)"/>
+        </item>
+        <IOPad id="11" useCaseMode="0">
+            <item id="11" caption="PIN 9 (IO7)">
+                <graphics pos="(758.00,300.00)" angle="0" flipping="1" hidden="0" tOrigin="(20.00,10.00)"/>
+            </item>
+        </IOPad>
+        <IOPad id="12" useCaseMode="0">
+            <item id="12" caption="PIN 8 (IO8)">
+                <graphics pos="(692.00,505.00)" angle="0" flipping="1" hidden="0" tOrigin="(20.00,10.00)"/>
+                <textLabel pos="(-4.71,-27.00)" angle="0.00" textColor="#ffff00ff" backgroundColor="#14141464">PLD_IO8</textLabel>
+            </item>
+        </IOPad>
+        <VDDItem id="13">
+            <item id="13" caption="VDD2 (PIN 7)">
+                <graphics pos="(770.00,170.00)" angle="0" flipping="1" hidden="0" tOrigin="(20.00,10.00)"/>
+            </item>
+        </VDDItem>
+        <IOPad id="14" useCaseMode="0">
+            <item id="14" caption="PIN 6 (IO9)">
+                <graphics pos="(636.00,631.00)" angle="0" flipping="1" hidden="0" tOrigin="(20.00,10.00)"/>
+                <textLabel pos="(-4.71,-27.00)" angle="0.00" textColor="#ffff00ff" backgroundColor="#14141464">PLD_IO9</textLabel>
+            </item>
+        </IOPad>
+        <IOPad id="15" useCaseMode="0">
+            <item id="15" caption="PIN 5 (IO10)">
+                <graphics pos="(770.00,30.00)" angle="0" flipping="1" hidden="0" tOrigin="(20.00,10.00)"/>
+            </item>
+        </IOPad>
+        <IOPad id="16" useCaseMode="0">
+            <item id="16" caption="PIN 4 (IO11)">
+                <graphics pos="(300.00,-90.00)" angle="270" flipping="1" hidden="0" tOrigin="(20.00,10.00)"/>
+            </item>
+        </IOPad>
+        <IOPad id="17" useCaseMode="0">
+            <item id="17" caption="PIN 3 (IO12)">
+                <graphics pos="(150.00,-90.00)" angle="270" flipping="1" hidden="0" tOrigin="(20.00,10.00)"/>
+            </item>
+        </IOPad>
+        <IOPad id="18" useCaseMode="4">
+            <item id="18" caption="PIN 2 (IO13)">
+                <graphics pos="(314.00,320.00)" angle="0" flipping="1" hidden="0" tOrigin="(20.00,10.00)"/>
+                <textLabel pos="(-7.69,-27.00)" angle="0.00" textColor="#ffff00ff" backgroundColor="#14141464">OUT_REQ</textLabel>
+            </item>
+        </IOPad>
+        <IOPad id="19" useCaseMode="1">
+            <item id="19" caption="PIN 1 (IO14)">
+                <graphics pos="(-175.00,390.00)" angle="0" flipping="0" hidden="0" tOrigin="(20.00,10.00)"/>
+                <textLabel pos="(-6.55,-27.00)" angle="0.00" textColor="#ffff00ff" backgroundColor="#14141464">ACK_BUF</textLabel>
+            </item>
+        </IOPad>
+        <item id="22" caption="A CMP0L">
+            <graphics pos="(50.00,130.00)" angle="0" flipping="0" hidden="1" tOrigin="(25.00,28.00)"/>
+        </item>
+        <item id="23" caption="A CMP1L">
+            <graphics pos="(150.00,130.00)" angle="0" flipping="0" hidden="1" tOrigin="(25.00,28.00)"/>
+        </item>
+        <item id="24" caption="P DLY">
+            <graphics pos="(320.00,320.00)" angle="0" flipping="0" hidden="1" tOrigin="(17.50,10.00)"/>
+        </item>
+        <item id="26" caption="VREF">
+            <graphics pos="(320.00,190.00)" angle="0" flipping="0" hidden="1" tOrigin="(17.50,10.00)"/>
+        </item>
+        <item id="27" caption="POR">
+            <graphics pos="(320.00,260.00)" angle="0" flipping="0" hidden="1" tOrigin="(17.50,10.00)"/>
+        </item>
+        <item id="28" caption="OSC0">
+            <graphics pos="(-70.00,100.00)" angle="0" flipping="0" hidden="1" tOrigin="(30.00,40.00)"/>
+        </item>
+        <item id="29" caption="OSC1">
+            <graphics pos="(-70.00,200.00)" angle="0" flipping="0" hidden="1" tOrigin="(30.00,25.00)"/>
+        </item>
+        <item id="30" caption="OSC2">
+            <graphics pos="(-70.00,270.00)" angle="0" flipping="0" hidden="1" tOrigin="(30.00,20.00)"/>
+        </item>
+        <item id="31" caption="I2C">
+            <graphics pos="(-674.00,652.00)" angle="0" flipping="0" hidden="0" tOrigin="(25.00,45.00)"/>
+        </item>
+        <item id="33" caption="FILTER/EDGE DET">
+            <graphics pos="(320.00,440.00)" angle="0" flipping="0" hidden="1" tOrigin="(27.50,15.00)"/>
+        </item>
+        <item id="34" caption="BG">
+            <graphics pos="(320.00,30.00)" angle="0" flipping="0" hidden="1" tOrigin="(17.50,10.00)"/>
+        </item>
+        <LUT id="35" regularShape="0" mode="0">
+            <item id="35" caption="2-bit LUT0/DFF/LATCH0">
+                <graphics pos="(17.00,28.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <LUT id="36" regularShape="0" mode="0">
+            <item id="36" caption="2-bit LUT1/DFF/LATCH1">
+                <graphics pos="(40.00,370.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <LUT id="37" regularShape="0" mode="0">
+            <item id="37" caption="2-bit LUT2/DFF/LATCH2">
+                <graphics pos="(40.00,430.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <LUT id="38" regularShape="0" mode="0">
+            <item id="38" caption="2-bit LUT3/PGEN">
+                <graphics pos="(130.00,250.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <LUT id="39" regularShape="0" mode="0">
+            <item id="39" caption="3-bit LUT0/DFF/LATCH3">
+                <graphics pos="(130.00,310.00)" angle="90" flipping="1" hidden="0" tOrigin="(20.00,15.00)"/>
+                <textLabel pos="(-28.00,68.36)" angle="-90.00" textColor="#ffff00ff" backgroundColor="#14141464">!(IN0 &amp; (IN1 ^ IN2))</textLabel>
+            </item>
+        </LUT>
+        <item id="40" caption="3-bit LUT1/DFF/LATCH4">
+            <graphics pos="(19.00,176.00)" angle="0" flipping="0" hidden="0" tOrigin="(25.00,10.00)"/>
+            <textLabel pos="(-15.00,-40.00)" angle="0.00" textColor="#ffff00ff" backgroundColor="#14141464">Previous
+DATA_TOGGLE</textLabel>
+        </item>
+        <LUT id="41" regularShape="0" mode="0">
+            <item id="41" caption="3-bit LUT2/DFF/LATCH5">
+                <graphics pos="(130.00,430.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <LUT id="42" regularShape="0" mode="0">
+            <item id="42" caption="3-bit LUT3/DFF/LATCH6">
+                <graphics pos="(210.00,250.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <LUT id="43" regularShape="0" mode="0">
+            <item id="43" caption="3-bit LUT4/DFF/LATCH7">
+                <graphics pos="(210.00,310.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <LUT id="44" regularShape="0" mode="0">
+            <item id="44" caption="3-bit LUT5/DFF/LATCH8">
+                <graphics pos="(210.00,370.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <LUT id="45" regularShape="0" mode="0">
+            <item id="45" caption="3-bit LUT6/Pipe Delay/Ripple Counter">
+                <graphics pos="(210.00,430.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <item id="46" caption="MF0 (4-bit LUT0, DFF/LATCH9, 16-bit CNT0/DLY0/FSM0)">
+            <graphics pos="(-500.00,-20.00)" angle="0" flipping="0" hidden="1" tOrigin="(155.00,60.00)"/>
+        </item>
+        <item id="47" caption="MF1 (3-bit LUT7, DFF/LATCH10, 8-bit CNT1/DLY1)">
+            <graphics pos="(-500.00,140.00)" angle="0" flipping="0" hidden="1" tOrigin="(155.00,60.00)"/>
+        </item>
+        <item id="48" caption="MF2 (3-bit LUT8, DFF/LATCH11, 8-bit CNT2/DLY2)">
+            <graphics pos="(-500.00,300.00)" angle="0" flipping="0" hidden="1" tOrigin="(155.00,60.00)"/>
+        </item>
+        <item id="49" caption="MF3 (3-bit LUT9, DFF/LATCH12, 8-bit CNT3/DLY3)">
+            <graphics pos="(-500.00,460.00)" angle="0" flipping="0" hidden="1" tOrigin="(155.00,60.00)"/>
+        </item>
+        <item id="50" caption="MF4 (3-bit LUT10, DFF/LATCH13, 8-bit CNT4/DLY4)">
+            <graphics pos="(430.00,-30.00)" angle="0" flipping="0" hidden="1" tOrigin="(155.00,60.00)"/>
+        </item>
+        <item id="51" caption="MF5 (3-bit LUT11, DFF/LATCH14, 8-bit CNT5/DLY5)">
+            <graphics pos="(430.00,130.00)" angle="0" flipping="0" hidden="1" tOrigin="(155.00,60.00)"/>
+        </item>
+        <item id="52" caption="MF6 (3-bit LUT12, DFF/LATCH15, 8-bit CNT6/DLY6)">
+            <graphics pos="(430.00,290.00)" angle="0" flipping="0" hidden="1" tOrigin="(155.00,60.00)"/>
+        </item>
+        <item id="53" caption="MF7 (3-bit LUT13, DFF/LATCH16, 8-bit CNT7/DLY7)">
+            <graphics pos="(430.00,450.00)" angle="0" flipping="0" hidden="1" tOrigin="(155.00,60.00)"/>
+        </item>
+        <LUT id="54" regularShape="0" mode="0">
+            <item id="54" caption="4-bit LUT0 (MF0)">
+                <graphics pos="(-365.00,25.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <item id="55" caption="DFF/LATCH9 (MF0)">
+            <graphics pos="(-450.00,-20.00)" angle="0" flipping="0" hidden="1" tOrigin="(25.00,10.00)"/>
+        </item>
+        <CNTDLY id="56" externalClockFrequence="0" externalClockFreqUnit="kHz">
+            <item id="56" caption="16-bit CNT0/DLY0/FSM0 (MF0)">
+                <graphics pos="(-450.00,-20.00)" angle="0" flipping="0" hidden="1" tOrigin="(35.00,16.00)"/>
+            </item>
+        </CNTDLY>
+        <LUT id="57" regularShape="0" mode="0">
+            <item id="57" caption="3-bit LUT7 (MF1)">
+                <graphics pos="(-365.00,185.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <item id="58" caption="DFF/LATCH10 (MF1)">
+            <graphics pos="(-450.00,130.00)" angle="0" flipping="0" hidden="1" tOrigin="(25.00,10.00)"/>
+        </item>
+        <CNTDLY id="59" externalClockFrequence="0" externalClockFreqUnit="kHz">
+            <item id="59" caption="8-bit CNT1/DLY1 (MF1)">
+                <graphics pos="(-450.00,130.00)" angle="0" flipping="0" hidden="1" tOrigin="(30.00,16.00)"/>
+            </item>
+        </CNTDLY>
+        <LUT id="60" regularShape="0" mode="0">
+            <item id="60" caption="3-bit LUT8 (MF2)">
+                <graphics pos="(-365.00,345.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <item id="61" caption="DFF/LATCH11 (MF2)">
+            <graphics pos="(-550.00,300.00)" angle="0" flipping="0" hidden="1" tOrigin="(25.00,10.00)"/>
+        </item>
+        <CNTDLY id="62" externalClockFrequence="0" externalClockFreqUnit="kHz">
+            <item id="62" caption="8-bit CNT2/DLY2 (MF2)">
+                <graphics pos="(-550.00,300.00)" angle="0" flipping="0" hidden="1" tOrigin="(30.00,16.00)"/>
+            </item>
+        </CNTDLY>
+        <LUT id="63" regularShape="0" mode="0">
+            <item id="63" caption="3-bit LUT9 (MF3)">
+                <graphics pos="(-365.00,505.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <item id="64" caption="DFF/LATCH12 (MF3)">
+            <graphics pos="(-730.00,460.00)" angle="0" flipping="0" hidden="1" tOrigin="(25.00,10.00)"/>
+        </item>
+        <CNTDLY id="65" externalClockFrequence="0" externalClockFreqUnit="kHz">
+            <item id="65" caption="8-bit CNT3/DLY3 (MF3)">
+                <graphics pos="(-730.00,460.00)" angle="0" flipping="0" hidden="1" tOrigin="(30.00,16.00)"/>
+            </item>
+        </CNTDLY>
+        <LUT id="66" regularShape="0" mode="0">
+            <item id="66" caption="3-bit LUT10 (MF4)">
+                <graphics pos="(565.00,15.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <item id="67" caption="DFF/LATCH13 (MF4)">
+            <graphics pos="(660.00,-210.00)" angle="0" flipping="0" hidden="1" tOrigin="(25.00,10.00)"/>
+        </item>
+        <CNTDLY id="68" externalClockFrequence="0" externalClockFreqUnit="kHz">
+            <item id="68" caption="8-bit CNT4/DLY4 (MF4)">
+                <graphics pos="(660.00,-210.00)" angle="0" flipping="0" hidden="1" tOrigin="(30.00,16.00)"/>
+            </item>
+        </CNTDLY>
+        <LUT id="69" regularShape="0" mode="0">
+            <item id="69" caption="3-bit LUT11 (MF5)">
+                <graphics pos="(565.00,175.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <item id="70" caption="DFF/LATCH14 (MF5)">
+            <graphics pos="(500.00,-50.00)" angle="0" flipping="0" hidden="1" tOrigin="(25.00,10.00)"/>
+        </item>
+        <CNTDLY id="71" externalClockFrequence="0" externalClockFreqUnit="kHz">
+            <item id="71" caption="8-bit CNT5/DLY5 (MF5)">
+                <graphics pos="(500.00,-50.00)" angle="0" flipping="0" hidden="1" tOrigin="(30.00,16.00)"/>
+            </item>
+        </CNTDLY>
+        <LUT id="72" regularShape="0" mode="0">
+            <item id="72" caption="3-bit LUT12 (MF6)">
+                <graphics pos="(565.00,335.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <item id="73" caption="DFF/LATCH15 (MF6)">
+            <graphics pos="(330.00,110.00)" angle="0" flipping="0" hidden="1" tOrigin="(25.00,10.00)"/>
+        </item>
+        <CNTDLY id="74" externalClockFrequence="0" externalClockFreqUnit="kHz">
+            <item id="74" caption="8-bit CNT6/DLY6 (MF6)">
+                <graphics pos="(330.00,110.00)" angle="0" flipping="0" hidden="1" tOrigin="(30.00,16.00)"/>
+            </item>
+        </CNTDLY>
+        <LUT id="75" regularShape="0" mode="0">
+            <item id="75" caption="3-bit LUT13 (MF7)">
+                <graphics pos="(565.00,495.00)" angle="90" flipping="0" hidden="1" tOrigin="(20.00,15.00)"/>
+            </item>
+        </LUT>
+        <item id="76" caption="DFF/LATCH16 (MF7)">
+            <graphics pos="(170.00,270.00)" angle="0" flipping="0" hidden="1" tOrigin="(25.00,10.00)"/>
+        </item>
+        <CNTDLY id="77" externalClockFrequence="0" externalClockFreqUnit="kHz">
+            <item id="77" caption="8-bit CNT7/DLY7 (MF7)">
+                <graphics pos="(170.00,270.00)" angle="0" flipping="0" hidden="1" tOrigin="(30.00,16.00)"/>
+            </item>
+        </CNTDLY>
+        <wire output="147" input="111" autoRouting="1" pen="#ff8000ff;1.00;1;32;128" lineType="2" protected="1" CWLid="0" wireText="NET0" wireState="0">
+            <points>(-702.00,682.00); (-695.00,682.00)</points>
+        </wire>
+        <wire output="148" input="112" autoRouting="1" pen="#ff8000ff;1.00;1;32;128" lineType="2" protected="1" CWLid="1" wireText="NET1" wireState="0">
+            <points>(-702.00,712.00); (-695.00,712.00)</points>
+        </wire>
+        <wire output="142" input="549" autoRouting="1" pen="#00ff00ff;1.00;1;32;128" lineType="1" protected="0" CWLid="8" wireText="NET8" wireState="0">
+            <points>(-109.00,293.00); (-31.00,293.00); (-31.00,326.00); (114.00,326.00)</points>
+        </wire>
+        <wire output="161" input="551" autoRouting="1" pen="#00ff00ff;1.00;1;32;128" lineType="1" protected="0" CWLid="9" wireText="NET9" wireState="0">
+            <points>(185.00,326.00); (191.00,326.00); (191.00,227.00); (-8.00,227.00); (-8.00,192.00); (-2.00,192.00)</points>
+        </wire>
+        <wire output="143" input="537" autoRouting="1" pen="#00ff00ff;1.00;1;32;128" lineType="1" protected="0" CWLid="10" wireText="NET10" wireState="0">
+            <points>(-112.00,518.00); (335.00,518.00); (335.00,360.00)</points>
+        </wire>
+        <wire output="143" input="553" autoRouting="1" pen="#00ff00ff;1.00;1;32;128" lineType="1" protected="0" CWLid="10" wireText="NET10" wireState="0">
+            <points>(-112.00,518.00); (45.00,518.00); (45.00,216.00)</points>
+        </wire>
+        <wire output="142" input="552" autoRouting="1" pen="#00ff00ff;1.00;1;32;128" lineType="1" protected="0" CWLid="8" wireText="NET8" wireState="0">
+            <points>(-109.00,293.00); (-31.00,293.00); (-31.00,182.00); (-2.00,182.00)</points>
+        </wire>
+        <wire output="157" input="548" autoRouting="1" pen="#00ff00ff;1.00;1;32;128" lineType="1" protected="0" CWLid="7" wireText="NET7" wireState="0">
+            <points>(-113.00,406.00); (93.00,406.00); (93.00,339.00); (114.00,339.00)</points>
+        </wire>
+        <wire output="162" input="550" autoRouting="1" pen="#00ff00ff;1.00;1;32;128" lineType="1" protected="0" CWLid="11" wireText="NET11" wireState="0">
+            <points>(89.00,186.00); (95.00,186.00); (95.00,312.00); (114.00,312.00)</points>
+        </wire>
+        <wire output="161" input="536" autoRouting="1" pen="#00ff00ff;1.00;1;32;128" lineType="1" protected="0" CWLid="9" wireText="NET9" wireState="0">
+            <points>(185.00,326.00); (291.00,326.00)</points>
+        </wire>
+    </chip>
+    <emulatorConfiguration version="1">
+        <settings>
+            <autoApply value="0"/>
+            <platformSelector id="3"/>
+        </settings>
+        <platform id="0" friendlyName="GreenPAK DIP Development Platform">
+            <lastConfiguration modified="0">
+                <SaveEmulator Name="Default">
+                    <PowerOptions synced="0"/>
+                    <PowerSwitch internalPower="1" externalPower="0"/>
+                    <ExpansionConnector></ExpansionConnector>
+                    <TestPoints/>
+                    <I2C slaveAddress="-1"/>
+                </SaveEmulator>
+            </lastConfiguration>
+            <savedConfigurations/>
+        </platform>
+        <platform id="1" friendlyName="GreenPAK Advanced Development Platform">
+            <lastConfiguration modified="0">
+                <SaveEmulator Name="Default">
+                    <PowerOptions synced="0"/>
+                    <PowerSwitch internalPower="1" externalPower="0"/>
+                    <ExpansionConnector></ExpansionConnector>
+                    <TestPoints/>
+                    <I2C slaveAddress="-1"/>
+                </SaveEmulator>
+            </lastConfiguration>
+            <savedConfigurations/>
+        </platform>
+        <platform id="2" friendlyName="GreenPAK Pro Development Platform">
+            <lastConfiguration modified="0">
+                <SaveEmulator Name="Default">
+                    <PowerOptions synced="0"/>
+                    <PowerSwitch internalPower="1" externalPower="0"/>
+                    <ExpansionConnector></ExpansionConnector>
+                    <TestPoints/>
+                    <I2C slaveAddress="-1"/>
+                </SaveEmulator>
+            </lastConfiguration>
+            <savedConfigurations/>
+        </platform>
+        <platform id="4" friendlyName="GreenPAK Serial Debugger">
+            <lastConfiguration modified="0">
+                <SaveEmulator Name="Default">
+                    <PowerOptions synced="0"/>
+                    <PowerSwitch internalPower="1" externalPower="0"/>
+                    <ExpansionConnector></ExpansionConnector>
+                    <TestPoints/>
+                    <I2C slaveAddress="-1"/>
+                </SaveEmulator>
+            </lastConfiguration>
+            <savedConfigurations/>
+        </platform>
+        <platform id="5" friendlyName="GreenPAK Advanced Development Platform w/ Logic Level Adapter #1">
+            <lastConfiguration modified="0">
+                <SaveEmulator Name="Default">
+                    <PowerOptions synced="0"/>
+                    <PowerSwitch internalPower="1" externalPower="0"/>
+                    <ExpansionConnector></ExpansionConnector>
+                    <TestPoints/>
+                    <I2C slaveAddress="-1"/>
+                </SaveEmulator>
+            </lastConfiguration>
+            <savedConfigurations/>
+        </platform>
+        <platform id="6" friendlyName="ForgeFPGA Development Platform">
+            <lastConfiguration modified="0">
+                <SaveEmulator Name="Default">
+                    <PowerOptions synced="0"/>
+                    <PowerSwitch internalPower="1" externalPower="0"/>
+                    <ExpansionConnector></ExpansionConnector>
+                    <TestPoints/>
+                    <I2C slaveAddress="-1"/>
+                </SaveEmulator>
+            </lastConfiguration>
+            <savedConfigurations/>
+        </platform>
+    </emulatorConfiguration>
+    <simulationConfiguration version="13" compatibleVersion="13" activePreset="-1">
+        <draftPreset>
+            <simulationPreset index="-1" name="Default" customGroupLayout="false" customParametricDcGroupLayout="false">
+                <transientAnalyses>
+                    <transientAnalysis stopTime="12m" maxTimeStep="20u" startTime="0" stepTime="20u" temperature="25" useInitialConditions="false" vdd="3.3"/>
+                </transientAnalyses>
+                <parametricDcAnalyses/>
+                <pinProbes>
+                    <pinProbe instrumentId="0" measurementFlags="1">
+                        <IdDto category="5" componentType="43" componentNumber="1" pinNumber="0"/>
+                    </pinProbe>
+                    <pinProbe instrumentId="1" measurementFlags="1">
+                        <IdDto category="5" componentType="43" componentNumber="2" pinNumber="0"/>
+                    </pinProbe>
+                </pinProbes>
+                <groups/>
+                <parametricDcGroups/>
+                <waveforms/>
+                <components>
+                    <component simulationModel="">
+                        <componentId category="5" componentType="0" componentNumber="1"/>
+                        <componentSpec manufacturer="" partNumber=""/>
+                        <componentUiSettings isFlippedHorizontally="false" isFlippedVertically="false" visible="true" position="(-818.116;93.379)" rotationState="0" sceneIndex="0"/>
+                        <schematicProps>
+                            <param id="name" affinity="4" value="GND"/>
+                        </schematicProps>
+                        <instanceProps/>
+                    </component>
+                    <component simulationModel="">
+                        <componentId category="5" componentType="0" componentNumber="2"/>
+                        <componentSpec manufacturer="" partNumber=""/>
+                        <componentUiSettings isFlippedHorizontally="false" isFlippedVertically="false" visible="true" position="(1005.89;233.679)" rotationState="0" sceneIndex="0"/>
+                        <schematicProps>
+                            <param id="name" affinity="4" value="GND"/>
+                        </schematicProps>
+                        <instanceProps/>
+                    </component>
+                    <component simulationModel="">
+                        <componentId category="5" componentType="0" componentNumber="3"/>
+                        <componentSpec manufacturer="" partNumber=""/>
+                        <componentUiSettings isFlippedHorizontally="false" isFlippedVertically="false" visible="true" position="(848.494;443.262)" rotationState="0" sceneIndex="0"/>
+                        <schematicProps>
+                            <param id="name" affinity="4" value="GND"/>
+                        </schematicProps>
+                        <instanceProps/>
+                    </component>
+                    <component simulationModel="">
+                        <componentId category="5" componentType="43" componentNumber="1"/>
+                        <componentSpec manufacturer="" partNumber=""/>
+                        <componentUiSettings isFlippedHorizontally="false" isFlippedVertically="false" visible="true" position="(-749.099;19.6022)" rotationState="0" sceneIndex="0"/>
+                        <schematicProps>
+                            <param id="name" affinity="4" value="V1"/>
+                            <param id="has_rc" affinity="1" value="1"/>
+                            <param id="int_r" affinity="3" value="10"/>
+                            <param id="int_c" affinity="3" value="100n"/>
+                            <param id="show_one_period" affinity="1" value="0"/>
+                            <param id="has_limited_voltage" affinity="1" value="0"/>
+                            <param id="dc_analysis_voltage" affinity="3" value="3.3"/>
+                            <param id="signal_type" affinity="1" value="1"/>
+                            <param id="prestart_delay" affinity="3" value="0"/>
+                            <param id="ramp_voltage" affinity="3" value="3.3"/>
+                            <param id="ramp_rise_time" affinity="3" value="1m"/>
+                        </schematicProps>
+                        <instanceProps/>
+                    </component>
+                    <component simulationModel="">
+                        <componentId category="5" componentType="43" componentNumber="2"/>
+                        <componentSpec manufacturer="" partNumber=""/>
+                        <componentUiSettings isFlippedHorizontally="true" isFlippedVertically="false" visible="true" position="(926.958;159.848)" rotationState="0" sceneIndex="0"/>
+                        <schematicProps>
+                            <param id="name" affinity="4" value="V2"/>
+                            <param id="has_rc" affinity="1" value="1"/>
+                            <param id="int_r" affinity="3" value="10"/>
+                            <param id="int_c" affinity="3" value="100n"/>
+                            <param id="show_one_period" affinity="1" value="0"/>
+                            <param id="has_limited_voltage" affinity="1" value="1"/>
+                            <param id="dc_analysis_voltage" affinity="3" value="3.3"/>
+                            <param id="signal_type" affinity="1" value="1"/>
+                            <param id="prestart_delay" affinity="3" value="0"/>
+                            <param id="ramp_voltage" affinity="3" value="3.3"/>
+                            <param id="ramp_rise_time" affinity="3" value="1m"/>
+                        </schematicProps>
+                        <instanceProps/>
+                    </component>
+                </components>
+                <networks>
+                    <network networkId="6" name="NET6">
+                        <connections>
+                            <connection connectionType="0" routingType="0" sceneIndex="0">
+                                <from>
+                                    <IdDto category="5" componentType="43" componentNumber="1" pinNumber="1"/>
+                                </from>
+                                <to>
+                                    <IdDto category="5" componentType="0" componentNumber="1" pinNumber="0"/>
+                                </to>
+                                <path>
+                                    <point value="(-771;41)"/>
+                                    <point value="(-802;41)"/>
+                                    <point value="(-802;71)"/>
+                                </path>
+                            </connection>
+                        </connections>
+                    </network>
+                    <network networkId="5" name="NET5">
+                        <connections>
+                            <connection connectionType="0" routingType="0" sceneIndex="0">
+                                <from>
+                                    <IdDto category="5" componentType="0" componentNumber="3" pinNumber="0"/>
+                                </from>
+                                <to>
+                                    <IdDto category="100" componentType="45" componentNumber="0" pinNumber="10"/>
+                                </to>
+                                <path>
+                                    <point value="(864;421)"/>
+                                    <point value="(864;391)"/>
+                                    <point value="(832;391)"/>
+                                </path>
+                            </connection>
+                        </connections>
+                    </network>
+                    <network networkId="4" name="NET4">
+                        <connections>
+                            <connection connectionType="0" routingType="0" sceneIndex="0">
+                                <from>
+                                    <IdDto category="5" componentType="43" componentNumber="2" pinNumber="0"/>
+                                </from>
+                                <to>
+                                    <IdDto category="100" componentType="45" componentNumber="0" pinNumber="7"/>
+                                </to>
+                                <path>
+                                    <point value="(905;181)"/>
+                                    <point value="(832;181)"/>
+                                </path>
+                            </connection>
+                        </connections>
+                    </network>
+                    <network networkId="3" name="NET3">
+                        <connections>
+                            <connection connectionType="0" routingType="0" sceneIndex="0">
+                                <from>
+                                    <IdDto category="5" componentType="0" componentNumber="2" pinNumber="0"/>
+                                </from>
+                                <to>
+                                    <IdDto category="5" componentType="43" componentNumber="2" pinNumber="1"/>
+                                </to>
+                                <path>
+                                    <point value="(1022;212)"/>
+                                    <point value="(1022;181)"/>
+                                    <point value="(990;181)"/>
+                                </path>
+                            </connection>
+                        </connections>
+                    </network>
+                    <network networkId="2" name="NET2">
+                        <connections>
+                            <connection connectionType="0" routingType="0" sceneIndex="0">
+                                <from>
+                                    <IdDto category="5" componentType="43" componentNumber="1" pinNumber="0"/>
+                                </from>
+                                <to>
+                                    <IdDto category="100" componentType="45" componentNumber="0" pinNumber="20"/>
+                                </to>
+                                <path>
+                                    <point value="(-686;41)"/>
+                                    <point value="(-613;41)"/>
+                                </path>
+                            </connection>
+                        </connections>
+                    </network>
+                </networks>
+            </simulationPreset>
+        </draftPreset>
+        <simulationPresets/>
+    </simulationConfiguration>
+    <projectData>
+        <specs>
+            <lastModify lastModifyValue="01.02.2022 7:10:58"/>
+            <vddSpecs vddMin="2.8" vddTyp="3" vddMax="3.2"/>
+            <vdd2Specs vdd2Min="2.8" vdd2Typ="3" vdd2Max="3.2"/>
+            <tempSpecs tempMin="0" tempTyp="25" tempMax="40"/>
+        </specs>
+        <projectDataFields>
+            <textLineDataField name="Customer&#10;Name:" id="2" text=""/>
+            <textLineDataField name="Customer&#10;Project Name:" id="3" text=""/>
+            <textLineDataField name="Customer&#10;Project Number:" id="4" text=""/>
+            <textLineDataField name="Customer&#10;Version Number:" id="5" text=""/>
+            <multiTextLineDataField>
+                <textLineDataField name="Notes:" id="6" text=""/>
+            </multiTextLineDataField>
+        </projectDataFields>
+    </projectData>
+    <i2cTool>
+        <i2cDebugger version="1"/>
+        <i2cStepper version="1" rowCount="0"/>
+        <i2cRegsTable version="1" tabCount="0"/>
+    </i2cTool>
+</GPDProject>

greenpak/SCSI_Accelerator_SLG46824.hex

@@ -0,0 +1,17 @@
+:100000000000000000008D3049C200000000000028
+:1000100000000000000000000000000000000000E0
+:1000200000000000000000000000000000000000D0
+:1000300000000000000000000000000000000000C0
+:100040000000D200000000000000000000000000DE
+:1000500000000000000000000000000000000000A0
+:100060000030700030303030000030303000303040
+:100070003030000000000000000000000000000020
+:1000800000000000001422300C00000000000000FE
+:1000900000000000D7000000000040000000000049
+:1000A0000000002000010000000201000002000129
+:1000B0000000020100000200010000020100000235
+:1000C0000001000002000100000001010100000029
+:1000D0000000000000000000000000000000000020
+:1000E0000000000000000000000000000000000010
+:1000F000000000000000000000000000000000A55B
+:00000001FF

lib/AzulSCSI_platform_GD32F205/AzulSCSI_platform.cpp

@@ -3,6 +3,7 @@
 #include "gd32f20x_fmc.h"
 #include "AzulSCSI_log.h"
 #include "AzulSCSI_config.h"
+#include "greenpak.h"
 #include <SdFat.h>
 #include <scsi.h>
 #include <assert.h>
@@ -188,6 +189,8 @@ void azplatform_init()
     {
         g_azlog_debug = false;
     }
+
+    greenpak_load_firmware();
 }
 
 /*****************************************/

lib/AzulSCSI_platform_GD32F205/AzulSCSI_v1_1_gpio.h

@@ -41,6 +41,16 @@
 #define SCSI_TIMER_DMACHB_IRQ DMA1_Channel1_IRQHandler
 #define SCSI_TIMER_DMACHB_IRQn DMA1_Channel1_IRQn
 
+// GreenPAK logic chip pins
+#define GREENPAK_I2C_ADDR 0x10
+#define GREENPAK_I2C_PORT GPIOB
+#define GREENPAK_I2C_SCL GPIO_PIN_8
+#define GREENPAK_I2C_SDA GPIO_PIN_9
+#define GREENPAK_PLD_IO1 GPIO_PIN_15
+#define GREENPAK_PLD_IO2 GPIO_PIN_3
+#define GREENPAK_PLD_IO3 GPIO_PIN_5
+#define GREENPAK_PLD_IO4 GPIO_PIN_7
+
 // SCSI input data port
 #define SCSI_IN_PORT  GPIOE
 #define SCSI_IN_DB7   GPIO_PIN_15

lib/AzulSCSI_platform_GD32F205/greenpak.cpp

@@ -0,0 +1,184 @@
+// I2C communication with GreenPAK.
+// This uses bitbanging for I2C so that internal GPIO pull-up can be used
+// and to avoid the bugs that are present in STM32F2 I2C peripheral,
+// it is uncertain if the same bugs apply to GD32F2.
+
+#include "AzulSCSI_platform.h"
+#include "AzulSCSI_log.h"
+#include "greenpak.h"
+#include "greenpak_fw.h"
+
+#ifndef GREENPAK_I2C_PORT
+
+bool greenpak_write(uint16_t regaddr, const uint8_t *data, int length) { return false; }
+bool greenpak_read(uint16_t regaddr, uint8_t *data, int length) { return false; }
+bool greenpak_load_firmware() { return false; }
+bool greenpak_is_ready() { return false; }
+
+#else
+
+bool g_greenpak_is_ready;
+
+// SCL is driven as push-pull, SDA is driven as IPU / OUT_OD
+#define I2C_SCL_HI() GPIO_BOP(GREENPAK_I2C_PORT) = GREENPAK_I2C_SCL
+#define I2C_SCL_LO() GPIO_BC(GREENPAK_I2C_PORT) = GREENPAK_I2C_SCL
+#define I2C_SDA_HI() gpio_init(GREENPAK_I2C_PORT, GPIO_MODE_IPU, 0, GREENPAK_I2C_SDA)
+#define I2C_SDA_LO() gpio_init(GREENPAK_I2C_PORT, GPIO_MODE_OUT_OD, GPIO_OSPEED_2MHZ, GREENPAK_I2C_SDA), GPIO_BC(GREENPAK_I2C_PORT) = GREENPAK_I2C_SDA
+#define I2C_SDA_READ() (GPIO_ISTAT(GREENPAK_I2C_PORT) & GREENPAK_I2C_SDA)
+#define I2C_DELAY() delay_ns(10000);
+
+static void greenpak_gpio_init()
+{
+    gpio_bit_set(GREENPAK_I2C_PORT, GREENPAK_I2C_SCL | GREENPAK_I2C_SDA);
+    gpio_init(GREENPAK_I2C_PORT, GPIO_MODE_IPU, 0, GREENPAK_I2C_SDA);
+    gpio_init(GREENPAK_I2C_PORT, GPIO_MODE_OUT_PP, GPIO_OSPEED_2MHZ, GREENPAK_I2C_SCL);
+
+    // Data bits used for communication
+    uint32_t greenpak_io = GREENPAK_PLD_IO1 | GREENPAK_PLD_IO2;
+    gpio_bit_reset(SCSI_OUT_PORT, greenpak_io);
+    gpio_init(SCSI_OUT_PORT, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, greenpak_io);
+}
+
+static void i2c_writebit(bool bit)
+{
+    if (bit)
+        I2C_SDA_HI();
+    else
+        I2C_SDA_LO();
+
+    I2C_DELAY();
+    I2C_SCL_HI();
+    I2C_DELAY();
+    I2C_SCL_LO();
+}
+
+static bool i2c_readbit()
+{
+    I2C_SDA_HI(); // Pull-up
+    I2C_DELAY();
+    I2C_SCL_HI();
+    I2C_DELAY();
+    bool result = I2C_SDA_READ();
+    I2C_SCL_LO();
+    return result;
+}
+
+// Write byte to I2C bus, return ACK bit status
+static bool i2c_writebyte(uint8_t byte)
+{
+    for (int i = 0; i < 8; i++)
+    {
+        i2c_writebit(byte & (0x80 >> i));
+    }
+    return !i2c_readbit();
+}
+
+// Read byte from I2C bus
+static uint8_t i2c_readbyte(bool ack)
+{
+    uint8_t result = 0;
+    for (int i = 0; i < 8; i++)
+    {
+        result |= i2c_readbit() << (7 - i);
+    }
+
+    i2c_writebyte(!ack);
+    return result;
+}
+
+static bool i2c_start(uint8_t device_addr)
+{
+    // Initial signal state
+    I2C_SCL_HI();
+    I2C_SDA_HI();
+    I2C_DELAY();
+
+    // Start condition
+    I2C_SDA_LO();
+    I2C_DELAY();
+    
+    I2C_SCL_LO();
+    I2C_DELAY();
+
+    // Device address
+    return i2c_writebyte(device_addr);
+}
+
+static void i2c_stop()
+{
+    I2C_SDA_LO();
+    I2C_DELAY();
+    I2C_SCL_HI();
+    I2C_DELAY();
+    I2C_SDA_HI();
+    I2C_DELAY();
+}
+
+bool greenpak_write(uint16_t regaddr, const uint8_t *data, int length)
+{
+    bool status = true;
+    uint16_t blockaddr = regaddr >> 8;
+    status &= i2c_start(GREENPAK_I2C_ADDR | (blockaddr << 1));
+    status &= i2c_writebyte(regaddr & 0xFF);
+    
+    for (int i = 0; i < length; i++)
+    {
+        status &= i2c_writebyte(data[i]);
+    }
+
+    i2c_stop();
+    return status;
+}
+
+bool greenpak_read(uint16_t regaddr, uint8_t *data, int length)
+{
+    bool status = true;
+    uint16_t blockaddr = (regaddr >> 8) & 7;
+    status &= i2c_start(GREENPAK_I2C_ADDR | (blockaddr << 1));
+    status &= i2c_writebyte(regaddr & 0xFF);
+
+    status &= i2c_start(GREENPAK_I2C_ADDR | (blockaddr << 1) | 1);
+    
+    for (int i = 0; i < length; i++)
+    {
+        data[i] = i2c_readbyte(i < length - 1);
+    }
+
+    i2c_stop();
+    return status;
+}
+
+bool greenpak_load_firmware()
+{
+    uint8_t dummy;
+    greenpak_gpio_init();
+
+    if (!greenpak_read(0, &dummy, 1))
+    {
+        azlog("Optional GreenPAK not detected");
+        return false;
+    }
+    else
+    {
+        azlog("Optional GreenPAK detected, loading firmware");
+    }
+
+    if (!greenpak_write(0, g_greenpak_fw, sizeof(g_greenpak_fw)))
+    {
+        azlog("GreenPAK firmware loading failed");
+        return false;
+    }
+    else
+    {
+        azlog("GreenPAK firmware successfully loaded");
+        g_greenpak_is_ready = true;
+        return true;
+    }
+}
+
+bool greenpak_is_ready()
+{
+    return g_greenpak_is_ready;
+}
+
+#endif

lib/AzulSCSI_platform_GD32F205/greenpak.h

@@ -0,0 +1,13 @@
+// External GreenPAK SLG46824 programmable logic can optionally be used to
+// accelerate SCSI communications. This module contains code to load firmware
+// to the GreenPAK through I2C.
+
+#pragma once
+
+#include <stdint.h>
+
+bool greenpak_write(uint16_t regaddr, const uint8_t *data, int length);
+bool greenpak_read(uint16_t regaddr, uint8_t *data, int length);
+
+bool greenpak_load_firmware();
+bool greenpak_is_ready();

lib/AzulSCSI_platform_GD32F205/greenpak_fw.h

@@ -0,0 +1,24 @@
+const uint8_t g_greenpak_fw[] = {
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x8d, 0x30, 0x49, 0xc2, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xd2, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x30, 0x70, 0x00, 0x30, 0x30, 0x30, 0x30, 0x00, 0x00, 0x30, 0x30,
+  0x30, 0x00, 0x30, 0x30, 0x30, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x14, 0x22, 0x30, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0xd7, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x01, 0x00, 0x00,
+  0x00, 0x02, 0x01, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x02, 0x01,
+  0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x02, 0x01, 0x00, 0x00, 0x02,
+  0x00, 0x01, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x01,
+  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0xa5
+};

lib/AzulSCSI_platform_GD32F205/scsiPhy.cpp

@@ -5,6 +5,7 @@
 #include "AzulSCSI_platform.h"
 #include "scsi_accel_asm.h"
 #include "scsi_accel_dma.h"
+#include "scsi_accel_greenpak.h"
 #include "AzulSCSI_log.h"
 #include "AzulSCSI_log_trace.h"
 
@@ -271,7 +272,14 @@ static void processPollingWrite(uint32_t count)
     if (count_words * 4 == count)
     {
         // Use accelerated subroutine
-        scsi_accel_asm_send((const uint32_t*)data, count_words, &scsiDev.resetFlag);
+        if (greenpak_is_ready())
+        {
+            scsi_accel_greenpak_send((const uint32_t*)data, count_words, &scsiDev.resetFlag);
+        }
+        else
+        {
+            scsi_accel_asm_send((const uint32_t*)data, count_words, &scsiDev.resetFlag);
+        }
     }
     else
     {

lib/AzulSCSI_platform_GD32F205/scsi_accel_greenpak.cpp

@@ -0,0 +1,192 @@
+#include "scsi_accel_greenpak.h"
+#include "AzulSCSI_platform.h"
+#include <AzulSCSI_log.h>
+#include <assert.h>
+
+#ifndef GREENPAK_PLD_IO1
+
+void scsi_accel_greenpak_send(const uint32_t *buf, uint32_t num_words, volatile int *resetFlag)
+{
+    assert(false);
+}
+
+#else
+
+extern const uint32_t g_scsi_out_byte_to_bop_pld1hi[256];
+extern const uint32_t g_scsi_out_byte_to_bop_pld1lo[256];
+
+// Optimized ASM blocks for the SCSI communication subroutine
+
+// Take 8 bits from d and format them for writing
+// d is name of data operand, b is bit offset, x is unique label
+#define ASM_LOAD_DATA_PLD1HI(d, b, x) \
+"    load_data1_" x "_%=: \n" \
+"        ubfx    %[tmp1], %[" d "], #" b ", #8 \n" \
+"        ldr     %[tmp1], [%[byte_lookup_pld1hi], %[tmp1], lsl #2] \n"
+
+#define ASM_LOAD_DATA_PLD1LO(d, b, x) \
+"    load_data1_" x "_%=: \n" \
+"        ubfx    %[tmp1], %[" d "], #" b ", #8 \n" \
+"        ldr     %[tmp1], [%[byte_lookup_pld1lo], %[tmp1], lsl #2] \n"
+
+// Write data to SCSI port
+#define ASM_SEND_DATA(x) \
+"    send_data" x "_%=: \n" \
+"        str     %[tmp1], [%[out_port_bop]] \n"
+
+// Wait for ACK to be low or REQ to be high.
+// The external logic will set REQ low when PLD_IO1 is toggled and
+// back high as soon as ACK goes low. New data can be written to
+// GPIO as soon as ACK goes low. If an interrupt happens in the
+// middle, we may miss the ACK pulse and should check REQ.
+#define ASM_WAIT_DONE(x) \
+"        ldr     %[tmp2], [%[ack_pin_bb]] \n" \
+"        cbz     %[tmp2], wait_done_" x "_%= \n" \
+"        ldr     %[tmp2], [%[ack_pin_bb]] \n" \
+"        cbz     %[tmp2], wait_done_" x "_%= \n" \
+"        ldr     %[tmp2], [%[ack_pin_bb]] \n" \
+"        cbz     %[tmp2], wait_done_" x "_%= \n" \
+"        ldr     %[tmp2], [%[ack_pin_bb]] \n" \
+"        cbz     %[tmp2], wait_done_" x "_%= \n" \
+"    wait_req_inactive_" x "_%=: \n" \
+"        ldr     %[tmp2], [%[req_pin_bb]] \n" \
+"        cbnz    %[tmp2], wait_done_" x "_%= \n" \
+"        ldr     %[tmp2], [%[reset_flag]] \n" \
+"        cbnz    %[tmp2], wait_done_" x "_%= \n" \
+"        b.n     wait_req_inactive_" x "_%= \n" \
+"    wait_done_" x "_%=: \n"
+
+// Send bytes to SCSI bus using the asynchronous handshake mechanism
+// Takes 4 bytes at a time for sending from buf.
+void scsi_accel_greenpak_send(const uint32_t *buf, uint32_t num_words, volatile int *resetFlag)
+{
+    volatile uint32_t *out_port_bop = (volatile uint32_t*)&GPIO_BOP(SCSI_OUT_PORT);
+    const uint32_t *byte_lookup = g_scsi_out_byte_to_bop;
+    uint32_t ack_pin_bb = PERIPH_BB_BASE + (((uint32_t)&GPIO_ISTAT(SCSI_ACK_PORT)) - APB1_BUS_BASE) * 32 + SCSI_IN_ACK_IDX * 4;
+    uint32_t req_pin_bb = PERIPH_BB_BASE + (((uint32_t)&GPIO_ISTAT(SCSI_OUT_PORT)) - APB1_BUS_BASE) * 32 + SCSI_OUT_REQ_IDX * 4;
+    register uint32_t tmp1 = 0;
+    register uint32_t tmp2 = 0;
+    register uint32_t data = 0;
+
+    // Set REQ pin as input and PLD_IO2 high to enable logic
+    GPIO_BC(SCSI_OUT_PORT) = GREENPAK_PLD_IO1;
+    gpio_init(SCSI_OUT_PORT, GPIO_MODE_IPU, 0, SCSI_OUT_REQ);
+    GPIO_BOP(SCSI_OUT_PORT) = GREENPAK_PLD_IO2;
+
+    asm volatile (
+    "   ldr      %[data], [%[buf]], #4 \n" \
+        ASM_LOAD_DATA_PLD1HI("data", "0", "first")
+        
+    "inner_loop_%=: \n" \
+        ASM_SEND_DATA("0")
+        ASM_LOAD_DATA_PLD1LO("data", "8", "8")
+        ASM_WAIT_DONE("0")
+        
+        ASM_SEND_DATA("8")
+        ASM_LOAD_DATA_PLD1HI("data", "16", "16")
+        ASM_WAIT_DONE("8")
+
+        ASM_SEND_DATA("16")
+        ASM_LOAD_DATA_PLD1LO("data", "24", "24")
+        ASM_WAIT_DONE("16")
+
+        ASM_SEND_DATA("24")
+    "   ldr      %[data], [%[buf]], #4 \n" \
+        ASM_LOAD_DATA_PLD1HI("data", "0", "0")
+        ASM_WAIT_DONE("24")
+
+    "   subs     %[num_words], %[num_words], #1 \n" \
+    "   bne     inner_loop_%= \n"
+    : /* Output */ [tmp1] "+l" (tmp1), [tmp2] "+l" (tmp2), [data] "+r" (data),
+                   [buf] "+r" (buf), [num_words] "+r" (num_words)
+    : /* Input */ [ack_pin_bb] "r" (ack_pin_bb),
+                  [req_pin_bb] "r" (req_pin_bb),
+                  [out_port_bop] "r"(out_port_bop),
+                  [byte_lookup_pld1hi] "r" (g_scsi_out_byte_to_bop_pld1hi),
+                  [byte_lookup_pld1lo] "r" (g_scsi_out_byte_to_bop_pld1lo),
+                  [reset_flag] "r" (resetFlag)
+    : /* Clobber */ );
+
+    SCSI_RELEASE_DATA_REQ();
+
+    // Disable external logic and set REQ pin as output
+    GPIO_BC(SCSI_OUT_PORT) = GREENPAK_PLD_IO2;
+    gpio_init(SCSI_OUT_PORT, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, SCSI_OUT_REQ);
+}
+
+/**********************************************/
+/* Mapping from data bytes to GPIO BOP values */
+/**********************************************/
+
+#define PARITY(n) ((1 ^ (n) ^ ((n)>>1) ^ ((n)>>2) ^ ((n)>>3) ^ ((n)>>4) ^ ((n)>>5) ^ ((n)>>6) ^ ((n)>>7)) & 1)
+#define X(n) (\
+    ((n & 0x01) ? (SCSI_OUT_DB0 << 16) : SCSI_OUT_DB0) | \
+    ((n & 0x02) ? (SCSI_OUT_DB1 << 16) : SCSI_OUT_DB1) | \
+    ((n & 0x04) ? (SCSI_OUT_DB2 << 16) : SCSI_OUT_DB2) | \
+    ((n & 0x08) ? (SCSI_OUT_DB3 << 16) : SCSI_OUT_DB3) | \
+    ((n & 0x10) ? (SCSI_OUT_DB4 << 16) : SCSI_OUT_DB4) | \
+    ((n & 0x20) ? (SCSI_OUT_DB5 << 16) : SCSI_OUT_DB5) | \
+    ((n & 0x40) ? (SCSI_OUT_DB6 << 16) : SCSI_OUT_DB6) | \
+    ((n & 0x80) ? (SCSI_OUT_DB7 << 16) : SCSI_OUT_DB7) | \
+    (PARITY(n)  ? (SCSI_OUT_DBP << 16) : SCSI_OUT_DBP) | \
+    (GREENPAK_PLD_IO1) \
+)
+    
+const uint32_t g_scsi_out_byte_to_bop_pld1hi[256] =
+{
+    X(0x00), X(0x01), X(0x02), X(0x03), X(0x04), X(0x05), X(0x06), X(0x07), X(0x08), X(0x09), X(0x0a), X(0x0b), X(0x0c), X(0x0d), X(0x0e), X(0x0f),
+    X(0x10), X(0x11), X(0x12), X(0x13), X(0x14), X(0x15), X(0x16), X(0x17), X(0x18), X(0x19), X(0x1a), X(0x1b), X(0x1c), X(0x1d), X(0x1e), X(0x1f),
+    X(0x20), X(0x21), X(0x22), X(0x23), X(0x24), X(0x25), X(0x26), X(0x27), X(0x28), X(0x29), X(0x2a), X(0x2b), X(0x2c), X(0x2d), X(0x2e), X(0x2f),
+    X(0x30), X(0x31), X(0x32), X(0x33), X(0x34), X(0x35), X(0x36), X(0x37), X(0x38), X(0x39), X(0x3a), X(0x3b), X(0x3c), X(0x3d), X(0x3e), X(0x3f),
+    X(0x40), X(0x41), X(0x42), X(0x43), X(0x44), X(0x45), X(0x46), X(0x47), X(0x48), X(0x49), X(0x4a), X(0x4b), X(0x4c), X(0x4d), X(0x4e), X(0x4f),
+    X(0x50), X(0x51), X(0x52), X(0x53), X(0x54), X(0x55), X(0x56), X(0x57), X(0x58), X(0x59), X(0x5a), X(0x5b), X(0x5c), X(0x5d), X(0x5e), X(0x5f),
+    X(0x60), X(0x61), X(0x62), X(0x63), X(0x64), X(0x65), X(0x66), X(0x67), X(0x68), X(0x69), X(0x6a), X(0x6b), X(0x6c), X(0x6d), X(0x6e), X(0x6f),
+    X(0x70), X(0x71), X(0x72), X(0x73), X(0x74), X(0x75), X(0x76), X(0x77), X(0x78), X(0x79), X(0x7a), X(0x7b), X(0x7c), X(0x7d), X(0x7e), X(0x7f),
+    X(0x80), X(0x81), X(0x82), X(0x83), X(0x84), X(0x85), X(0x86), X(0x87), X(0x88), X(0x89), X(0x8a), X(0x8b), X(0x8c), X(0x8d), X(0x8e), X(0x8f),
+    X(0x90), X(0x91), X(0x92), X(0x93), X(0x94), X(0x95), X(0x96), X(0x97), X(0x98), X(0x99), X(0x9a), X(0x9b), X(0x9c), X(0x9d), X(0x9e), X(0x9f),
+    X(0xa0), X(0xa1), X(0xa2), X(0xa3), X(0xa4), X(0xa5), X(0xa6), X(0xa7), X(0xa8), X(0xa9), X(0xaa), X(0xab), X(0xac), X(0xad), X(0xae), X(0xaf),
+    X(0xb0), X(0xb1), X(0xb2), X(0xb3), X(0xb4), X(0xb5), X(0xb6), X(0xb7), X(0xb8), X(0xb9), X(0xba), X(0xbb), X(0xbc), X(0xbd), X(0xbe), X(0xbf),
+    X(0xc0), X(0xc1), X(0xc2), X(0xc3), X(0xc4), X(0xc5), X(0xc6), X(0xc7), X(0xc8), X(0xc9), X(0xca), X(0xcb), X(0xcc), X(0xcd), X(0xce), X(0xcf),
+    X(0xd0), X(0xd1), X(0xd2), X(0xd3), X(0xd4), X(0xd5), X(0xd6), X(0xd7), X(0xd8), X(0xd9), X(0xda), X(0xdb), X(0xdc), X(0xdd), X(0xde), X(0xdf),
+    X(0xe0), X(0xe1), X(0xe2), X(0xe3), X(0xe4), X(0xe5), X(0xe6), X(0xe7), X(0xe8), X(0xe9), X(0xea), X(0xeb), X(0xec), X(0xed), X(0xee), X(0xef),
+    X(0xf0), X(0xf1), X(0xf2), X(0xf3), X(0xf4), X(0xf5), X(0xf6), X(0xf7), X(0xf8), X(0xf9), X(0xfa), X(0xfb), X(0xfc), X(0xfd), X(0xfe), X(0xff)
+};
+
+#undef X
+
+#define X(n) (\
+    ((n & 0x01) ? (SCSI_OUT_DB0 << 16) : SCSI_OUT_DB0) | \
+    ((n & 0x02) ? (SCSI_OUT_DB1 << 16) : SCSI_OUT_DB1) | \
+    ((n & 0x04) ? (SCSI_OUT_DB2 << 16) : SCSI_OUT_DB2) | \
+    ((n & 0x08) ? (SCSI_OUT_DB3 << 16) : SCSI_OUT_DB3) | \
+    ((n & 0x10) ? (SCSI_OUT_DB4 << 16) : SCSI_OUT_DB4) | \
+    ((n & 0x20) ? (SCSI_OUT_DB5 << 16) : SCSI_OUT_DB5) | \
+    ((n & 0x40) ? (SCSI_OUT_DB6 << 16) : SCSI_OUT_DB6) | \
+    ((n & 0x80) ? (SCSI_OUT_DB7 << 16) : SCSI_OUT_DB7) | \
+    (PARITY(n)  ? (SCSI_OUT_DBP << 16) : SCSI_OUT_DBP) | \
+    (GREENPAK_PLD_IO1 << 16) \
+)
+    
+const uint32_t g_scsi_out_byte_to_bop_pld1lo[256] =
+{
+    X(0x00), X(0x01), X(0x02), X(0x03), X(0x04), X(0x05), X(0x06), X(0x07), X(0x08), X(0x09), X(0x0a), X(0x0b), X(0x0c), X(0x0d), X(0x0e), X(0x0f),
+    X(0x10), X(0x11), X(0x12), X(0x13), X(0x14), X(0x15), X(0x16), X(0x17), X(0x18), X(0x19), X(0x1a), X(0x1b), X(0x1c), X(0x1d), X(0x1e), X(0x1f),
+    X(0x20), X(0x21), X(0x22), X(0x23), X(0x24), X(0x25), X(0x26), X(0x27), X(0x28), X(0x29), X(0x2a), X(0x2b), X(0x2c), X(0x2d), X(0x2e), X(0x2f),
+    X(0x30), X(0x31), X(0x32), X(0x33), X(0x34), X(0x35), X(0x36), X(0x37), X(0x38), X(0x39), X(0x3a), X(0x3b), X(0x3c), X(0x3d), X(0x3e), X(0x3f),
+    X(0x40), X(0x41), X(0x42), X(0x43), X(0x44), X(0x45), X(0x46), X(0x47), X(0x48), X(0x49), X(0x4a), X(0x4b), X(0x4c), X(0x4d), X(0x4e), X(0x4f),
+    X(0x50), X(0x51), X(0x52), X(0x53), X(0x54), X(0x55), X(0x56), X(0x57), X(0x58), X(0x59), X(0x5a), X(0x5b), X(0x5c), X(0x5d), X(0x5e), X(0x5f),
+    X(0x60), X(0x61), X(0x62), X(0x63), X(0x64), X(0x65), X(0x66), X(0x67), X(0x68), X(0x69), X(0x6a), X(0x6b), X(0x6c), X(0x6d), X(0x6e), X(0x6f),
+    X(0x70), X(0x71), X(0x72), X(0x73), X(0x74), X(0x75), X(0x76), X(0x77), X(0x78), X(0x79), X(0x7a), X(0x7b), X(0x7c), X(0x7d), X(0x7e), X(0x7f),
+    X(0x80), X(0x81), X(0x82), X(0x83), X(0x84), X(0x85), X(0x86), X(0x87), X(0x88), X(0x89), X(0x8a), X(0x8b), X(0x8c), X(0x8d), X(0x8e), X(0x8f),
+    X(0x90), X(0x91), X(0x92), X(0x93), X(0x94), X(0x95), X(0x96), X(0x97), X(0x98), X(0x99), X(0x9a), X(0x9b), X(0x9c), X(0x9d), X(0x9e), X(0x9f),
+    X(0xa0), X(0xa1), X(0xa2), X(0xa3), X(0xa4), X(0xa5), X(0xa6), X(0xa7), X(0xa8), X(0xa9), X(0xaa), X(0xab), X(0xac), X(0xad), X(0xae), X(0xaf),
+    X(0xb0), X(0xb1), X(0xb2), X(0xb3), X(0xb4), X(0xb5), X(0xb6), X(0xb7), X(0xb8), X(0xb9), X(0xba), X(0xbb), X(0xbc), X(0xbd), X(0xbe), X(0xbf),
+    X(0xc0), X(0xc1), X(0xc2), X(0xc3), X(0xc4), X(0xc5), X(0xc6), X(0xc7), X(0xc8), X(0xc9), X(0xca), X(0xcb), X(0xcc), X(0xcd), X(0xce), X(0xcf),
+    X(0xd0), X(0xd1), X(0xd2), X(0xd3), X(0xd4), X(0xd5), X(0xd6), X(0xd7), X(0xd8), X(0xd9), X(0xda), X(0xdb), X(0xdc), X(0xdd), X(0xde), X(0xdf),
+    X(0xe0), X(0xe1), X(0xe2), X(0xe3), X(0xe4), X(0xe5), X(0xe6), X(0xe7), X(0xe8), X(0xe9), X(0xea), X(0xeb), X(0xec), X(0xed), X(0xee), X(0xef),
+    X(0xf0), X(0xf1), X(0xf2), X(0xf3), X(0xf4), X(0xf5), X(0xf6), X(0xf7), X(0xf8), X(0xf9), X(0xfa), X(0xfb), X(0xfc), X(0xfd), X(0xfe), X(0xff)
+};
+
+#undef X
+
+#endif

lib/AzulSCSI_platform_GD32F205/scsi_accel_greenpak.h

@@ -0,0 +1,8 @@
+// SCSI subroutines using external GreenPAK logic chip for acceleration
+
+#pragma once
+
+#include <stdint.h>
+#include "greenpak.h"
+
+void scsi_accel_greenpak_send(const uint32_t *buf, uint32_t num_words, volatile int *resetFlag);

utils/convert_greenpak_hex.sh

@@ -0,0 +1,14 @@
+#!/bin/bash -ex
+# This script converts .hex file from GreenPAK GP6 design tool
+# to a .h file that can be included in code.
+
+INFILE="greenpak/SCSI_Accelerator_SLG46824.hex"
+TMPFILE="/tmp/greenpak.bin"
+OUTFILE="lib/AzulSCSI_platform_GD32F205/greenpak_fw.h"
+
+objcopy --input-target=ihex --output-target=binary $INFILE $TMPFILE
+
+echo 'const uint8_t g_greenpak_fw[] = {' > $OUTFILE
+cat $TMPFILE | xxd -i >> $OUTFILE
+echo '};' >> $OUTFILE
+