Hi. I have a problem with USB enumeration in TMS320VC5509A. I'm getting correct packets from host into my setup buffer, but when I'am getting a device descriptor request – I'm getting a problem. I fill the endpoint input buffer 0 with the packet data then write 0x12 ( packet size and the NAK bit clear ) into USBICT0 . But the packet doesn't get sent. The packet counter doesn't change and the next setup packet I receive is “reset”. After that the host stops USB enumeration process. Did anybody had such a problem?