| 摘要 |
A backup shift register module having at least two backup shift registers is used to repair a defective main shift-register module. A normally open link is provided between the input of first backup shift register and the input of each odd-numbered main shift register, and between the output of first backup shift register and the input of each even-numbered main shift register. A normally open link is provided between the input of second backup shift register and the input of each even-numbered main shift register, and between the output of second backup shift register and the input of each odd-numbered main shift register. If one main shift register is defective, the input and output of the defective shift register are disconnected from the cascade link, and the normally open links are connected to the input of the defective shift register and the output of the next shift register are connected.
|
