Efficient ROM and PLA recoding to save chip area

Details Efficient ROM and PLA recoding to save chip area Efficient ROM and PLA recoding to save chip area

1997-06-23

1998-09-22

Coleman, Eric

Boots, shoes, and leggings

364153, G06F 900

Patent

active

058128565

ABSTRACT:
DSP size and cost can be reduced by shrinking the program ROM and opcode interpreter (e.g., PLA) to store and recognize only #OC unique opcodes from within the total available opcodes for the DSP. The minimum opcode length M is the smallest integer satisfying 2.sup.M .gtoreq.#OC. It is preferred to choose an opcode length M'>M so that the total chip area occupied by the ROM plus PLA is minimized without loss of chip performance. By converting 24 bit opcodes to 16 bit opcodes for M=12 and M'=16, the combined program ROM and PLA areas are reduced by .about.1/3rd and the overall DSP is significantly smaller.

REFERENCES:
patent: 4763255 (1988-08-01), Hopkins
patent: 4773007 (1988-09-01), Kanada
patent: 5247668 (1993-09-01), Smith
patent: 5274818 (1993-12-01), Vasilevsky
patent: 5555417 (1996-09-01), Odnert
patent: 5734908 (1998-03-01), Chan
patent: 5752035 (1998-05-01), Trimberger

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