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.