| 摘要 |
PURPOSE:To perform a test of a logical circuit including a register file with high efficiency by reading the contents of the register file with use of a write address stored in a normal mode as a read address. CONSTITUTION:A shift mode pin 3 is set at ''1'' to obtain a shift mode, and the same shift-in value is written to all slave flip-flops 14-17. Then the pin 3 is set at ''0'' to obtain a normal mode. Thus the data given from a data pin 1 via a master flip-flop 13 is written to a slave flip-flop shown by a write address. Finally the pin 3 is set at ''1'' again to obtain a shift mode. Then a shift-out action is carried out from an output pin 10. The contents of slave flip-flops shown by the addresses stored in the flip-flops 31 and 32 are shifted out to the pin 10 via a selector 18. |
