| 摘要 |
PURPOSE:To repeat easily a microinstruction by adding a gate means having a dynamic NAND output of a dynamic PLA and a storage means for an output of the microinstruction at one input and having an output of a gate means as input where other input receives a precharge signal. CONSTITUTION:The dynamic PLA is constituted as a dynamic NAND where Nch transistors (TRs O are connected in series with respect to a point A. The output at the point A is given to one gate of a negative OR of the next stage, an output of the negative OR enters a gate of the Nch TRs connected in parallel to turn on the Nch TRs and then the microinstruction is outputted. When the microinstruction is outputted, an RS filp-flop is set and its Q output is inputted in steady state to the other gate of the 2-input NAND3. Through a series of operation above, the microinstruction is being outputted except that the precharge signal is at a low level.
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