| 摘要 |
PROBLEM TO BE SOLVED: To decrease the number of address signal lines and data lines to be wired, to make the wiring simplified, to reduce circuit area, and to facilitate timing control. SOLUTION: In a semiconductor memory having a block-write function and a column mask function, by providing an AND gate 6 and an OR gate 7 in a Y main decoder 2 as a means setting a column mask, at the time of performing block-write, all bit low level signals have only to be sent to the Y main decoder 2 from a pre-decoder 1 to perform block-write. It is not required for signals, whose different column masks are already set for each main decoder, to be sent individually. And also, data for setting the column mask have not to be sent to a control circuit having the pre-decoder 1.
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