| 摘要 |
PURPOSE:To attain an access to a memory of different mapping of a memory by changing the control of chip selection in response to the memory capacity of the memory. CONSTITUTION:The byte address signals are supplied to chips 41-44 via signal lines A0-A12 respectively. The output Q of a flip-flop 3 sets '0' or '1' in accordance with the capacity of a memory chip and supplies it to a selection terminal S of a multiplexer 1. The signals inputted to input terminals A1 and B1 are applied to a signal selector 2 when the signal inputted to the terminal S is equal to '0'. While the signals inputted to input terminals A2 and B2 are applied to the selector 2 when the signal inputted to the terminal S is equal to '1' respectively. The chip selection signal CS is produced by the selector 2 and the contents of the memory position in the memory chip are selected by the signal CS. Then the selected contents of the memory position are given to an interface part 6 via a data bus 8.
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