Patent ID: 6145033
Filing Date: 2000-11-07
Classification: G06F,G09G,Y02D

Abstract:
Apparatus for requesting data transfer from a memory to a display FIFO during static display and for issuing prioritized requests including low priority requests and high priority requests for data for loading into said display FIFO, comprising:a counter for tracking a FIFO data level of said FIFO;a comparator, responsive to said counter, for comparing said FIFO data level against a predetermined low priority threshold value;said comparator, responsive to said counter, for comparing said FIFO data level against a predetermined high priority threshold value lower than said low priority threshold value, said high priority threshold value representing a FIFO underrun threshold;said comparator activating said low priority request for data when said FIFO data level falls below or is equal to said high priority threshold value and deactivating an issued low priority request for data when said FIFO data level is greater than said low priority threshold value;said comparator activating said high priority request for data when said FIFO data level falls below or is equal to said high priority threshold value and deactivating an issued high priority request for data when said FIFO data level is greater than said high priority threshold value.