XST_DELAY
delay(XST_DELAY * 1000 >> 2);
SEC_TO_NSEC(XST_DELAY) >> 2);
delay(XST_DELAY * 1000 >> 2);
SEC_TO_NSEC(XST_DELAY) >> 2);
delay(XST_DELAY * 1000 >> 2);
xs->xs_rchan, SEC_TO_NSEC(XST_DELAY) >> 2);