Microprogrammed control unit with multiple branch capability

Details Microprogrammed control unit with multiple branch capability Microprogrammed control unit with multiple branch capability

1981-11-09

1984-05-01

Krass, Errol A.

Boots, shoes, and leggings

G06F 922

Patent

active

044465181

ABSTRACT:
A microprogrammed control unit with multiple branch capability comprises in addition to a control memory, a first auxiliary read/write memory (21) having low parallelism and a second auxiliary read/write memory (30) having high parallelism. The reading of a microinstruction from the control memory also causes the reading of an information from the first auxiliary memory, such information being used to address the reading of the second auxiliary memory. The information read out from the second auxiliary memory specifies jump conditions (JC1, JC2, JC3) to be examined and jump addresses (JA1, JA2, JA3) and extends the information contained in the microinstruction read out from control memory.
Thus it is possible to associate jump (or branch) microinstructions to operative microinstructions and particularly multiple branch microinstructions to curtail the design time of the microprogram and the control memory size devoted to store them.
A priority network 40 coupled to the second auxiliary memory determines the priority to be followed during the concurrent examination of several jump conditions and selects the jump address among several possible addresses according to the highest priority verified jump condition.

REFERENCES:
patent: 3949372 (1976-04-01), Brioschi
patent: 3979725 (1976-09-01), Disparte et al.
patent: 3980991 (1976-09-01), Mercurio
patent: 3983541 (1976-09-01), Faber
patent: 3988719 (1976-10-01), Whitby et al.
patent: 4038643 (1977-07-01), Kim
patent: 4118773 (1978-10-01), Raguin et al.
patent: 4307445 (1981-12-01), Tredennick et al.
A. K. Agrawala et al., "Foundations of Microprogramming", 1976, pp. 254-306.

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