According to the aspect of the present invention, n stage counter in {TAIL ~ 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 which area is to be counted up 
According to the aspect of the present invention , n stage counter in { TAIL ~ 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 which area is to be counted up
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH