USB FX2 Mass Storage Implementation

Hello all,

I working on a Cypress FX2 dev board thats Bulk-Only Mass Storage Compliant.

I've looked at the CY4611 example in detail, but it is more limited than I need. I need to implement SCSI protocol at the firmware level, because there is no SCSI compliant device behind it.

The problem I'm having is that I need to check for a CBW header to see if it's a valid SCSI command. This in it's turn makes it impossible to run in AUTO mode. When I recieve a invalid CBW command according to the USB MSC BOT 6.6.1 docs I need to wait for a reset recovery. "6.6.1 CBW Not Valid If the CBW is not valid, the device shall STALL the Bulk-In pipe. Also, the device shall either STALL the Bulk-Out pipe, or the device shall accept and discard any Bulk-Out data. The device shall maintain this state until a Reset Recovery."

Does this mean the device will be reset at hardware level by a USB reset or do I need to wait for an UNSTALL of the endpoint by a Clear_Feature?

Also when the CBW is valid, I can read the CBW header from the EPxFIFOBUF but after readling I can't seem to be able to flush the buffer to recieve new data. FIFORESET, will clear the buffer but I will loose all the data I've stored in the other buffers. OUTPKTEND = 0x82; doesn't seem to skip the packet (is it because i've accessed it already?).

So what would be the best way to read the EP2FIFOBUFFER and get rid of it without resetting the buffers.

On a side note: Is there a differnce between AUTOOUT=1 and 0 when arming OUT buffers. As far I can see in AUTOOUT=1 this will set the EP2CS to

Thanks for any help you can give me

-- Erick van Rijk