| 摘要 |
PURPOSE:To quicken the access time of a memory device, and also to decrease the external part for constituting the memory device by providing a circuit for inputting the first address signal in response to a strobe signal from the outside, and outputting an acknowledge signal for indicating that the input of the first address signal concerned is ended, after said input is ended. CONSTITUTION:When the read of a low address signal is ended in all memory chips, a switching signal SW obtains a high level due to a pull-up resistance and an external multiplexer 9 is switched. The external multiplexer 9 is operated to impress a low address signal RA to an address input terminal ADD of each memory chip when the switching signal SW is at a low level, and a column address signal CA is impressed to the address input terminal concerned ADD in case of a high level. In each memory chip 8-1, 8-2,-8-8, a column address strobe signal is generated in the inside of the chip in a prescribed time after the time point when an acknowledge signal ACK obtains a high level to read the column address signal CA from the external multiplexer 9. |
