Hi, I have written a firmware for cypress ezusb fx2 usb controller which does the basic loop back operation. Following are my endpoint...

Hi, I have written a firmware for cypress ezusb fx2 usb controller which does the basic loop back operation. Following are my endpoint configuration. EP2 ---> IN 512 Double Buffered EP4 ---> OUT 512 Double Buffered EP6 ---> IN 512 Double Buffered EP8 ---> OUT 512 Double Buffered EP4 is connected to EP2 and EP8 is connected to EP6. Loopback works fine with EP4 and EP2 but fails with EP