Hello everyone, I'm not sure if anyone posted about this before: In USB 1.1 core from opencores_ws, file usb1_ctrl.v, line 253, shouldn't there be "(rom_size_dd > wLength[15:0])", instead of [6:0]?
When used with NI VISA driver, host asks for 0x400 bytes of configuration descriptor(0x80 0x6 0x0 0x2 0x0 0x0 0x0 0x4). This caused device to return 0 bytes, now it seems to work properly. Was anyone facing the same problem?

Just to let you know I replicated this issue in a test and confirmed the following fixes it.

assign rom_size_d = ({9'b000000000,rom_size_dd} > wLength) ? wLength : rom_size_dd;