Pipeline microcomputer having branch instruction detector and bu

Details Pipeline microcomputer having branch instruction detector and bu Pipeline microcomputer having branch instruction detector and bu

1989-11-27

1992-03-24

Lee, Thomas C.

Boots, shoes, and leggings

3642318, 3642405, 3642613, 364DIG1, 36496426, 36492691, 364938, 364DIG2, G06F 932, G06F 930, G06F 938

Patent

active

050994190

ABSTRACT:
In a microcomputer for use in combination with a memory which memorizes a sequence of instruction codes including branch instruction codes and ordinary instruction codes, each instruction is prefetched from the memory to a bus controller and monitored by a branch destination address calculator to detect whether or not each instruction code specifies the branch instruction code to calculate a branch destination address indicated by the branch destination address. Such calculation of the branch destination address is carried out before the branch instruction code is fed to an execution unit through an instruction code memory and executed by the execution unit indepenently of prefetch operation in the bus controller. The branch destination address calculator comprises a branch instruction detection circuit for detecting a branch instruction code and an address calculation circuit for calculating the branch destination address when the branch instruction code by the branch instruction detection circuit.

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