According to {HEAD ~ the aspect} of {TAIL ~ 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 an area discriminating signal can decide which area is to be counted up 
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According to { HEAD ~ the aspect } of { TAIL ~ 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 an area discriminating signal can decide which area is to be counted up
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