Microcode control system in a microcomputer capable of branching

Details Microcode control system in a microcomputer capable of branching Microcode control system in a microcomputer capable of branching

1987-09-16

1990-04-10

Zache, Raulfe B.

Boots, shoes, and leggings

364231, 3642316, 364243, 3642613, G06F 300, G06F 922

Patent

active

049166026

ABSTRACT:
A method and apparatus for fast branching of microcode sequences in a microcomputer. A branch controller provides addresses to a microcode memory and receives addresses and a branch control signal back from the memory for the next microcode to be executed. Prior to determining whether a branch instruction is present at the indicated location in the sequence, the branch controller provides a provisional address to the memory for the next sequential microcode in the sequence assuming that no branching is to occur. Then a determination is made whether a branch instruction is present. If so, the provisional address is changed by inverting one or more address bits to reflect the branching address and the changed address is applied within the same cycle to the memory.

REFERENCES:
patent: 4374416 (1983-02-01), Catiller et al.
patent: 4374418 (1983-02-01), Catiller et al.
patent: 4420819 (1983-12-01), Price et al.
patent: 4580216 (1986-04-01), Bellay et al.
patent: 4651275 (1987-03-01), McDonough
patent: 4736291 (1988-04-01), Jennings et al.

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