Update unit for providing a delayed update to a branch predictio

Details Update unit for providing a delayed update to a branch predictio Update unit for providing a delayed update to a branch predictio

1997-11-12

1999-03-02

Eng, David Y.

G06F 940

Patent

active

058782559

ABSTRACT:
An update unit for an array in an integrated circuit is provided. The update unit delays the update of the array until a clock cycle in which the functional input to the array is idle. The input port normally used by the functional input is then used to perform the update. During clock cycles between receiving the update and storing the update into the array, the update unit compares the current functional input address to the update address. If the current functional input address matches the update address, then the update value is provided as the output of the array. Otherwise, the information stored in the indexed storage location is provided. In this manner, the update appears to have been performed in the clock cycle that the update value was received, as in a dual-ported array. A particular embodiment of the update unit is a branch prediction array update unit.

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