| 摘要 |
<p>PURPOSE:To obtain a control pulse with a simple circuit by controlling a three- state gate circuit connected to each bit line of a data bus with output of a gate which makes the logical product of an output of address decoder and a write strobe signal. CONSTITUTION:An address signal is put on an address bus AB in one write cycle period, and an address decoder AD generates a decode output in the period corresponding to an address. When a write strobe signal WS which is outputted with a timing in which an operation is regulated arrives, the output of a NAND gate G becomes an L level, and the L level is impressed on the inhibiting terminals of three-states gate circuits T0-Ti, making conduct the circuits T0-Ti. Therefore, when bit lines D0-Di of a data bus DB are L levels, the output of L level is generated during the signal WS exists as the output, and when they are H levels, the output keeps the H level and no output pulse is generated.</p> |
