公开(公告)号：US06778458B2

公开(公告)日：2004-08-17

申请号：US10625914

申请日：2003-07-22

申请人： Ely K. Tsern ,  Richard M. Barth ,  Paul G. Davis ,  Craig E. Hampel

发明人： Ely K. Tsern ,  Richard M. Barth ,  Paul G. Davis ,  Craig E. Hampel

IPC分类号： G00C700

CPC分类号： G11C11/40618 ,  G11C8/08 ,  G11C11/406 ,  G11C11/40615 ,  G11C11/4085 ,  G11C2211/4061 ,  G11C2211/4067

摘要： A method for reducing the communication overhead over the interface bus to the memory devices for refresh operations. This is done by refreshing multiple banks in response to a single command. Multibank refresh is made possible by varying the current profile for the row sense and row precharge currents during a refresh operation, as compared to normal memory access. Unlike normal memory accesses, data is not needed, and a fast access time is not required. This allows the current to be spread using different circuitry for driving the current to lessen current spikes. The spread current is still maintained within the timing of a normal memory access.