Programmable phase generator for cross-clock communication...

Details Programmable phase generator for cross-clock communication... Programmable phase generator for cross-clock communication...

2005-05-10

2008-09-23

Connolly, Mark (Department: 2115)

Electrical computers and digital processing systems: support

Synchronization of clock or timing signals, data, or pulses

C713S375000, C713S600000

Reexamination Certificate

active

07428652

ABSTRACT:
A method and apparatus to support communication between components in different clock domains having a rational clock frequency ratio of N/D. In one embodiment, a combination of integer phase generators are employed to produce phase control signals during an overall cycle having N phases, wherein the overall cycle is a combination of primary cycles having D phases and an adjustment cycle having R phases, wherein R is the remainder of N/D. For clock frequency ratios of less than 2:1, a combination of 2:1 and 1:1 phase generators are employed. Clocking signals are generated by phase generator logic to provide timing control between communicating components in the different clock domains. In one embodiment, the phase generator logic is implemented in a programmable phase generator.

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