Microprogram process for single cycle jump instruction execution

Details Microprogram process for single cycle jump instruction execution Microprogram process for single cycle jump instruction execution

1990-11-30

1991-10-01

Anderson, Lawrence E.

Boots, shoes, and leggings

3642628, 3642615, 3642446, 3642718, G06F 922, G06F 932

Patent

active

050539540

ABSTRACT:
A microprogram processor to execute high speed processing of macro instructions using microcodes is provided. This microprogram processor comprises a microcode decoder for decoding a microcode generated from a microprogram ROM in response to a macro instruction, and a jump judgement decoder responsive to a jump condition signal externally delivered and a result decoded by the microcode decoder, to generate a microjump signal when a jump condition holds. The microprogram processor further comprises a circuit for generating a next instruction start signal for immediately shifting to a next instruction on the basis of a decoded signal signifying the start of a next macro instruction when no request for a jump is outputted from the microcode decoder. Such a next instruction start signal generator circuit may be realized by a simple logic circuit. In addition, the jump judgement decoder further responds to data of a portion (e.g., a specific bit) of operation data in addition to the decoded result and the jump condition signal. Such a specific bit may be a MSB. Thus, the execution of the step for shifting data and examining a carry as the jump condition becomes unnecessary.

REFERENCES:
patent: 4742451 (1988-05-01), Bruckert et al.
patent: 4747045 (1988-05-01), Harigai et al.
patent: 4760520 (1988-07-01), Shintani et al.

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