USB Host Mass storage issue

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Hi All,

I have developed a host controller driver for a custom controller on Win
CE 5.0. It has been found to work to work with almost all mass storage
devices like flash cards, SD cards, CD ROM drives and all. But it fails with
a 20 GB (Apricon) Hard disk.
This particular hard disk works fine with a CEPC (including microsoft OHCI
driver).
I have debugged the issue and found that after the enumeration is over mass
storage class driver gets loaded. It issues the first Bulk transfer of 31
bytes which is the SCSI command "Test unit ready". After this it expects a 13
byte Bulk-IN transfer from the device. I get the buffer for this 13 byte
transfer from the upper layer and I am configuring the ETD and TDs fine. In
all other devices I get the 13 byte IN data but here the device doen't
respond and the wait times out and it reissues the same transfer again ,times
out and resets the bus. I have seen the bus trace and found that the host is
issuing IN tokens and the device is NAK-ing.
What can be the issue? Anyone else faced the same issue.

Regards,

.

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