Control store system with flexible control word selection

Details Control store system with flexible control word selection Control store system with flexible control word selection

1974-09-24

1976-05-18

Zache, Raulfe B.

Communications: electrical

Digital comparator systems

G05B 1924, G06F 1308

Patent

active

039582272

ABSTRACT:
A branch-address translation register (BAXR) is loaded by a current or a prior control word field. A word selection decoder circuit receives the BAXR outputs and combines them with machine-status signals to generate a word selection signal for selecting a control word from a currently accessed branch group in the control store. A BAXR switching circuit is also provided so that any control word can switch off the BAXR output and cause a control word selection without translation. The invention can obtain any required degree of addressing flexibility in microcode branch selection, i.e. from partial to total flexibility.

REFERENCES:
patent: 3325785 (1967-06-01), Stevens
patent: 3391394 (1968-07-01), Ottaway et al.
patent: 3445818 (1969-05-01), Yen
patent: 3573854 (1971-04-01), Watson et al.
patent: 3656123 (1972-04-01), Carnevale et al.
patent: 3704448 (1972-11-01), Osborne et al.
patent: 3800293 (1974-03-01), Enger et al.

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