Hidden Refresh of 370 Memory for 370 Processor Based in the Personal Computer Box
Original Publication Date: 1985-Dec-01
Included in the Prior Art Database: 2005-Feb-19
When refreshing of an IBM System/370 memory is detected by the 370 memory controller, the controller pulls the asynchronous control line (channel ready) on the personal computer (PC) bus inactive so that the PC holds its addresses out as long as the 370 memory controller needs them to use for refresh. This could include an entire processor memory cycle because of arbitration. The memory can be refreshed without the need to go inactive and both PC and 370 performance is improved with the following design modification. When the PC has performed a refresh, it is latched and a refresh request is posted to the 370 memory controller.