Patent ID: 6046952
Filing Date: 2000-04-04
Classification: G06F,G11C

Abstract:
A digital apparatus to refresh a dynamic ram computer memory, said dynamic ram computer memory comprising at least one chip select, said apparatus comprising:a programmable refresh interval counter comprising an increment output;at least one chip select refresh counter for each of said at least one chip select comprising an increment input, a decrement input and a counter output, said increment input coupled to said increment output;first and second threshold values;a comparator coupled to said counter output and said first and second threshold values, said comparator comprising a chip select mask output, a refresh needed output and a refresh state machine input;a chip select request mask coupled to said chip select mask output;a dependency calculator comprising a dependency-met output; anda refresh state machine coupled to said dynamic ram computer memory, said decrement input and said chip select request mask and responsive to said refresh needed output and said dependency met output.