Bank history table for improved pre-charge scheduling of random access memory banks

摘要

A bank history table and precharge decision logic allows a memory controller to dynamically choose either to precharge a memory bank immediately after an access or to delay precharge based on the assumption that a subsequent access will be to the same row of the bank. The bank history table has a plurality of memory access history vectors. Each of the memory access history vectors corresponds to a respective one of a plurality of banks of memory. A precharge decision circuit is coupled to the bank history table and receives a selected one of the memory access history vectors and a new history bit. The precharge decision circuit makes a precharge prediction for the memory using the selected access history vector and the new history bit.