Microprogram data processor processing operand address calculati

Details Microprogram data processor processing operand address calculati Microprogram data processor processing operand address calculati

1994-06-27

1995-10-31

Teska, Kevin J.

Boots, shoes, and leggings

3642599, 3642628, 3642631, 3642663, 364DIG1, G06F 926, G06F 930, G06F 932, G06F 1200

Patent

active

054637473

ABSTRACT:
A data processor, comprises: a microaddress input selector 252 which, when decoding an instruction code, generates a main microaddress signal 212 corresponding to an operation code part, a submicroaddress signal 218 corresponding to an addressing mode designating part and an address calculation request signal 233 indicating whether address calculation is necessary or not, and selects an address signal corresponding to an operation code part or to an addressing mode designating part responsive to the address calculation request signal 233; and an instruction execution control unit control circuit 256 which controls the microaddress input selector 252; and is capable of executing the instruction having the addressing mode designating part independent from the operation code, rapidly and with a small microprogram size.

REFERENCES:
patent: 4870567 (1989-09-01), Kitamura et al.
patent: 5129068 (1992-07-01), Watanabe et al.
patent: 5187782 (1993-02-01), Kawasaki et al.
patent: 5247625 (1993-09-01), Yoshitake et al.

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