analog.com interface if_do_ctrl_rtl 1.0 request_enable required 1 required 1 in request_valid required 1 required 1 in request_ready required 1 in required 1 request_length required required in response_measured_length required required in response_eot required 1 in required 1 status_underflow required 1 in required 1 status_overflow required 1 in required 1