| 摘要 |
PURPOSE:To reduce the unnecessary power consumption with a non-selected decoder by controlling X decoder activating signals of two groups of memory cell arrays with the most significant bit of an address Y. CONSTITUTION:Memory cell arrays 1a and 1b as well as 1c and 1d which are divided into four parts to form two groups are selected by X decoders 21 and 22 which work in response to the activating signal sent from an NAND gate, etc. to which the most significant bit of a chip selection signal and an address Y is impressed together with the inverted most significant bit of a chip selection signal and an address Y. Therefore no activating signal is impressed to the decoder 21 or 22 of the non-selection side. Thus the unnecessary power consumption is reduced with a non-selected decoder. |
