Signal processing system with ROM storing instructions encoded f

Details Signal processing system with ROM storing instructions encoded f Signal processing system with ROM storing instructions encoded f

1996-04-29

1998-03-24

Ellis, Richard L.

39575003, G06F 922, G06F 132

Patent

active

057322554

ABSTRACT:
A digital signal processing system for executing instructions and processing data, including a program memory which stores encoded instructions, where the program memory consumes less power when a bit having a first logical level is read therefrom than when a bit having a second logical level is read therefrom, and where the most commonly read encoded instructions comprise more (and preferably many more) bits having the first logical level than bits having the second logical level. Preferably, the program memory is implemented as a read-only memory (ROM). Other aspects of the invention are a method for generating such encoded instructions and storing the encoded instructions in a ROM, a ROM which stores such encoded instructions, a digital signal processing system having a read-only program memory storing such encoded instructions, and methods for operating such a processing system.

REFERENCES:
patent: 3792441 (1974-02-01), Wymore et al.
patent: 4204252 (1980-05-01), Hitz et al.
patent: 5274829 (1993-12-01), Hotta et al.
patent: 5572736 (1996-11-01), Curran
Su et al., Saving Power in the Control Path of Embedded Processors, IEEE Design & Test of Computers, 1994, pp. 24-30.
Su et al., Low Power Architecture Design and Compilation Techniques for High-Performance Processors, IEEE, 1994, pp. 489-498.
J. M. Rabaey, "Digital Integrated Circuits: a design perspective," Prentice Hall, Englewood Cliffs, N.J., 1996, pp. 587, 596-609.

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