COMMAND-RE-ORDERING IN HUB INTERFACE UNIT BASED ON PRIORITY

摘要

Command reordering in the hub interface unit (HIU) (104) of Enhanced Direct Memory Access (EDMA) (103) functions is described. Without command reordering in the EDMA, commands are issued by the HIU to the peripheral in order of issue. If the higher priority transfers are issued later by the EDMA, the previously issued lower priority transfers would block the higher priority transfers. Command reordering in the HIU causes transfers to be reordered and issued to the peripheral based on their priority. Reordering allows the EDMA and HIU is to give due service to high priority transfer requests with decreased weight placed on the order in which the requests were issued.