Data storage device with improved interface transmitter training

Abstract

The present disclosure generally relates to an interface transmitting training method and algorithm. The receiving device can train the transmitting device to choose the correct tap for transmitting from the transmitting device. During the training, the receiving device will send a request for a directional change tap. The transmitting device will note the request, but not act on the request. The receiving device will then send another request for a direction change tap. If the new request is for the same directional change tap as the previous request, and the number of consecutive identical directional change tap requests exceeds a predetermined threshold, the request is executed. By so doing, the effect of randomness for choosing the correct tap is minimized and the link is not degraded by transmitter training. As such, there is an overall improvement in the bit error rate and reliability of the serial interface.