| 摘要 |
PURPOSE:To reduce energy consumption by controlling access operation from an input/output port in one part to a static form and controlling access operation from the remaining input/output port to a dynamic form. CONSTITUTION:A first control circuit 3 to control the access operation through an input/output port 4 in one part to the static form, which always select word lines WL1i and WL2i while following up the change of an input address signal, a second control circuit 7 to control the access operation through a remaining input/output port 8 to the dynamic form which synchronizes the operation to a clock are provided. In a data input/output system to be dynamically interfaced, a current does not flow from a bit line loading element through the selection register of a memory cell 10 and further the driving register of the memory cell 10 normally in a chip selecting state. Thus, the energy consumption can be reduced.
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