Minimal Interference REFRESH
Original Publication Date: 1988-Mar-01
Included in the Prior Art Database: 2005-Feb-14
Memory fresh requests and demands are done individually to different memory cards or controllers, but are all in sync to an address counter and timer. At the time when the refresh address counter is incremented, a refresh request is made to each memory card, or card controller if the card controller controls more than one memory card. The timer then times a predetermined amount of time, which has been loaded into the REFRESH LIMIT register, and then, if the refresh has not yet been done, gives a refresh demand. This demand is done at a time which will permit the memory card to complete any access in progress, and meet any precharge requirements necessary before the refresh occurs. (Image Omitted) Separate refresh request and demand signals are sent to each individual card controller.