| 摘要 |
<p>PURPOSE:To execute easily and exactly a replacement to a low speed IC memory from a high speed IC memory by selecting an NOT-OR circuit for buffering high speed and low speed output signals respectively, through a buffer/invertor circuit. CONSTITUTION:In accordance with turn-off and turn-on of a switch SW, an output of a buffer/invertor BUFF/INV is varied, an NOT-OR circuit NOR1 or NOR2 for a memory cell array is selected. Subsequently, a high speed output signal is buffered through the circuit NOR1, and a low speed output signal is buffered through the circuit NOR2 for connecting a delay inverter INV is buffered. In this way, a high speed IC memory is replaced with a low speed IC memory easily and exactly.</p> |
