Timing generator for plural reference clock frequencies

Details Timing generator for plural reference clock frequencies Timing generator for plural reference clock frequencies

1998-07-24

2000-05-02

Heckler, Thomas M.

Electrical computers and digital processing systems: support

Clock, pulse, or timing signal generation or analysis

395502, G06F 104

Patent

active

060584866

ABSTRACT:
A timing generator generates the same timing signals even when the frequency of a reference clock is changed. The timing generator includes a data memory for storing the timing data formed of quotient data and fractional data, a counter for counting the number of reference clock pulses and producing a delay time expressed by the quotient data, an accumulator for accumulating the fractional data and generating a carry signal when the accumulated value exceeds the reference clock period where the carry signal is provided to a cycle delay circuit for delaying an output of the counter by one cycle, a number converter for converting the timing data based on a ratio of first and second reference clocks, and a complementary number for compensating a time difference between the first and second reference clock periods.

REFERENCES:
patent: 3810121 (1974-05-01), Chang et al.
patent: 4191998 (1980-03-01), Carmody
patent: 4775954 (1988-10-01), Fujieda et al.
patent: 5359727 (1994-10-01), Kurita et al.
patent: 5430737 (1995-07-01), Yamashita et al.
patent: 5442642 (1995-08-01), Ingalls et al.
patent: 5553276 (1996-09-01), Dean
patent: 5590137 (1996-12-01), Yamashita

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