According to the aspect of the present invention, n stage counter in a refresh counter circuit can be used in common for refresh operation both in a normal area and in a parity area, and {HEAD ~ an area discriminating signal} can decide {TAIL ~ which area} is to be counted up 
decide
According to the aspect of the present invention , n stage counter in a refresh counter circuit can be used in common for refresh operation both in a normal area and in a parity area , and { HEAD ~ an area discriminating signal } can decide { TAIL ~ which area } is to be counted up
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