Appeal No. 1995-3903 Page 11
Application No. 08/062,737
loaded into the down counter. Then, the up counter is reset
to zero and begins counting. Simultaneously, the down counter
begins to count. The down counter will reach a zero count
after 512 microseconds, the nominal duration of each sector.
Id. at ll. 24-34.
When a qualification area has been tested, the TRIG pulse
is generated. It causes the up counter's count to be loaded
into the down counter. The resultant count measures the time
length of the preceding sector and is used to predict the
beginning of the next qualification area. Id. at ll. 36-39.
When a qualification area is not validated, the timing
controller does not initiate the clear and load operations of
the up and down counters, and a "virtual" TRIG pulse is
generated when the down counter reaches zero. The virtual
TRIG pulse operates in the same way as the aforementioned TRIG
pulse: the value in the up counter is loaded into the down
counter and then reset to begin counting from zero. Thus, the
timing controller achieves a flywheel action when a
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