System for selectively masking data in a branch address register

Details System for selectively masking data in a branch address register System for selectively masking data in a branch address register

1990-01-25

1993-05-11

Lee, Thomas C.

Boots, shoes, and leggings

3642597, 3642599, 3642613, 3642628, 364DIG1, G06F 900

Patent

active

052108333

ABSTRACT:
A microprogram control unit is provided for processing conditional branch micro-instructions stored in a micro-instruction memory to control the function of an information processing apparatus. The unit includes a microprogram counter coupled to the micro-instruction memory and contains an address for accessing the micro-instruction stored in the memory. A circuit is provided for registering the micro-instruction received from the micro-instruction memory and having an address field coupled to the microprogram counter and a condition field for designating a condition to be judged. A detecting circuit is coupled to the registering circuit to receive the micro-instruction therefrom and for detecting the conditional branch micro-instruction. Further, there is provided a circuit for generating status signals representing respectively a plurality of the status of the information processing apparatus and selectively outputting anyone of the status signals. There is also provided a circuit for judging coincidence between the status signal selectively outputted from the status signal generating circuit and the condition designated by the content of the condition field of the micro-instruction registered by the registering circuit to output a branch control signal. With this arrangement, the address field of the micro-program counter may be replaced by the content of the address field of the micro-instruction in accordance with the branch control signal.

REFERENCES:
patent: 3728689 (1973-04-01), Edwards, Jr.
patent: 3786434 (1974-01-01), Frye et al.
patent: 4011547 (1977-03-01), Kimmel
patent: 4180861 (1979-12-01), Armstrong et al.
patent: 4338661 (1982-07-01), Tredennick et al.
patent: 4580240 (1986-04-01), Watanabe
patent: 4651276 (1987-03-01), Vahlstrom

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