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Update README.md

Alex Perez 3 years ago
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      greenpak/README.md

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greenpak/README.md

@@ -2,7 +2,7 @@ GreenPAK design files
 =====================
 
 This folder contains design files for `SLG46824` programmable logic device.
-It is optionally used on ZuluSCSI V1.1 to speed up access to SCSI bus.
+It is optionally used on ZuluSCSI V1.1 to speed up access to SCSI bus. This applies to asynchronous transfers only
 
 What this logic does is implement the `REQ` / `ACK` handshake in hardware.
 The CPU only has to write new data to the GPIO, and the external logic will toggle `REQ` signal quickly.