Semiconductor memory device
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United States of America Patent
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Nov 16, 1999
Grant Date -
N/A
app pub date -
Jan 19, 1999
filing date -
Jan 20, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A semiconductor memory device (100) having reduced logic gates for selecting sense amplifier columns (102-0 to 102-2) is disclosed. Sense amplifier columns (102-0 to 102-2) are selected according to block address values X5 to X0. The order in which sense amplifier columns (102-0 to 102-2) are selected corresponds to a gray code in the lower two significant block address values (X1 and X0). In this arrangement, X1 can be applied to a NAND gate 110-0 within sense amplifier selecting circuit 106-1 as predecoded signal C1. X0 can be applied to a NAND gate 110-1 within sense amplifier selecting circuit 106-2 as predecoded signal C2. The use of predecoded values (X0 and X1) instead of decoded values can reduce the logic required to select the sense amplifier columns (102-0 to 102-2).
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