DRAM sub-array level autonomic refresh memory controller optimization

摘要

A method of refreshing a dynamic random access memory (DRAM) includes detecting an open page of the DRAM at a row of a DRAM bank within an open sub-array of the DRAM bank. The method also includes delaying issuance of a refresh command to a target refresh row of the DRAM bank when the target refresh row of the DRAM bank is within the open sub-array of the DRAM bank.

主权项

1. A method of refreshing a dynamic random access memory (DRAM), comprising:
resetting a refresh interval timer; detecting an open page of the DRAM at a row of a DRAM bank within an open sub-array of the DRAM bank; maintaining the open-sub-array of the DRAM bank by delaying issuance of a refresh command to a target refresh row of the DRAM bank when the target refresh row of the DRAM bank is within the open sub-array of the DRAM bank; incrementing a column before row (CBR) counter to select a new target refresh row; determining whether a refresh period has expired based on the refresh interval timer; and skipping issuance of the refresh command to a new target refresh address for the current refresh period when an open sub-array conflicts with the new target refresh row in response to determining the refresh period has expired.