| 摘要 |
A diagnostic circuit of the present invention has serial command input and output pins separate from its serial data input and output pins. In one embodiment, the diagnostic circuit has one command register and one data register, the data register receiving serially an input signal and providing serially an output signal through an input pin and an output pin respectively. In another embodiment, the diagnostic circuit has one command register and multiple data registers. Each data register including a zero-length register, can be separately addressed. In yet another embodiment, multiple serial data input and output pins are provided together with multiple data registers. |
