Microprocessor having fuse control and selection of clock multip

Details Microprocessor having fuse control and selection of clock multip Microprocessor having fuse control and selection of clock multip

1998-11-17

2000-12-12

Black, Thomas G.

Electrical computers and digital processing systems: support

Clock, pulse, or timing signal generation or analysis

Multiple or variable intervals or frequencies

713600, G06F 104

Patent

active

061611883

ABSTRACT:
A microprocessor is provided having selective control features to determine its core-to-bus clock ratio. The microprocessor includes a fuse and buffer/control logic. The fuse, fabricated on the microprocessor's metalization or poly layer, can be blown with a laser during fabrication. When blown, the fuse provides a permanent state that prescribes a fixed core-to-bus clock ratio. The buffer/control logic is coupled to the fuse. The buffer/control logic accepts the permanent state and directs the microprocessor to set the core-to-bus clock ratio to a fix value, thus disabling control of the core-to-bus clock ratio via external clock ratio control signals.

REFERENCES:
patent: 4771285 (1988-09-01), Agrawal et al.
patent: 4893271 (1990-01-01), Davis et al.
patent: 4908790 (1990-03-01), Little et al.
patent: 5099453 (1992-03-01), Steele
patent: 5261082 (1993-11-01), Ito et al.
patent: 5471587 (1995-11-01), Fernando
patent: 5600824 (1997-02-01), Williams et al.

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