I have this problem too. But I not solution this problem
Looks like firmware is not loaded into EZ-Host. Before trying to access registers/ memory, please check whether the co-processor is downloading the firmware into EZ-Host.
Regarding Request Code, wValue and wIndex...these will also be implemented in the EZ-Host firmware. You can look for standard/ vendor commands implemented in the firmware. Once the EZ-Host(if in USB peripheral mode) enumerates in the Host PC with the VendorID and ProductID as mentioned in the firmware, then using Cypress USB Console application control transfers can be done.