DSA是飞利浦提出的用于DVD等方案上的通讯协议，通过3线的控制，专用一条线作为接受到得标志的ack。虽然通讯的速度较慢，但是降低了通讯误码率，最难能可贵的是用普通的IO口也可轻松实现。当然，它不止可以用于DVD。-DSA is a Philips DVD and other programs proposed for the communication protocol, 3-wire control, a dedicated line was marked as received ack. Although the communication slower, but reduces the communication error rate, the most valuable is common IO port can also be easily achieved. Of course, it is more than can be used for DVD.