Method and apparatus for accessing microcoded instructions in a

Details Method and apparatus for accessing microcoded instructions in a Method and apparatus for accessing microcoded instructions in a

1993-09-07

1995-02-14

Coleman, Eric

Boots, shoes, and leggings

3642512, 3642526, 3642554, 3642551, 364DIG1, G06F 926

Patent

active

053903110

ABSTRACT:
A microprogrammed computer system having means for reducing entry point table size. The present invention describes a microprogrammed computer system in which opcodes are grouped and each group is mapped to a common entry point address in a microcode sequence memory. The actual microcodes for the instructions within the group are evenly distributed with the block and differentiated by opcode bits. The present invention discloses segmenting a microprogram and utilizing micro-jumps, as appropriate, to utilize the available microcode space. Utilizing the structure of the present invention reduces the number of required inputs to a PLA or similar means for generating entry points and further increases circuit speed and reduces entry point table size.

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