High-speed pattern generator

Details High-speed pattern generator High-speed pattern generator

1991-12-02

1995-02-14

Atkinson, Charles E.

Excavating

3649481, G01R 3128, G06F 1100

Patent

active

053901924

ABSTRACT:
A high speed pattern generator includes a programmable counter, n pattern generating circuits, a multiplexer and a control memory. The programmable counter divides a frequency of a system clock signal by n (n.gtoreq.2) to thereby generate a clock signal having a frequency of 1
of the frequency of the system clock and a select signal representative of a count output of said programmable counter. The n pattern generating circuits operate at a frequency determined by the clock signal and produce a pattern signal as a function. A multiplexer converts patterns generated by the n pattern generating circuits into a time-serial pattern in response to the select signal for sequentially selecting outputs of the n pattern generating circuits to thereby output a fast pattern. A control memory which operates at a frequency determined by the clock signal produces a control signal to periodically switch a frequency division ratio of the programmable counter between a plurality of ratios. When the frequency division ratio is changed, generation of any dummy pattern can be suppressed.

REFERENCES:
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patent: 4402081 (1983-08-01), Ichimiya et al.
patent: 4555663 (1985-11-01), Shimizu
patent: 4788684 (1988-11-01), Kawaguchi et al.
patent: 4797886 (1989-01-01), Imada
patent: 4876685 (1989-10-01), Rich
patent: 4905183 (1990-02-01), Kawaguchi et al.

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