| 摘要 |
PROBLEM TO BE SOLVED: To perform a data masking operation stably by generating a pulse signal in response to a data masking signal inputted to either one of a plurality of data masking pins thereby precharging a set of I/O lines sufficiently during the data masking operation. SOLUTION: Signals IOPR, LANG have no relation to data masking operation and the signal IOPR is logical 'Low' while the signal LANG is logical 'High' during the data masking operation. A pulse signal PDQMMUX is buffered through an NAND gate ND31, inverters I32, I33 and an NAND gate ND32 before being outputted as signal A. The pulse signal PDQMMUX is generated in response to a data masking signal being inputted to any one of four data masking pins.
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