Method and circuitry for synchronizing the read and update funct

Details Method and circuitry for synchronizing the read and update funct Method and circuitry for synchronizing the read and update funct

1980-01-24

1982-07-27

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

235 92T, H03K 2130

Patent

active

043419500

ABSTRACT:
The present invention pertains to a method and synchronizer circuit for controlling the counting operation of a timer/counter circuit to synchronize the read and update functions of this circuit. The synchronizer circuit is capable of establishing a search period prior to the occurrence of each update function. During each such search period, the synchronizer circuit searches for a read command. If a read command is not received by the synchronizer circuit within the search period preceding the occurrence of an update function, the synchronizer circuit allows the update function to occur without delay. If a read command is received by the synchronizer circuit within the search period preceding the occurrence of an update function, the synchronizer circuit delays the start of the update function until after termination of the read command that was received within the search period.

REFERENCES:
patent: 3063631 (1962-11-01), Ray
patent: 3602699 (1971-08-01), Kamachi
patent: 3716703 (1973-02-01), Gordon
patent: 3789195 (1974-01-01), Meier et al.
patent: 3806709 (1974-04-01), Fitch et al.
"8253/8253-5 , Programmable Interval Timer", Nitel Corp., 1978, specification sheets 1-40 thru 1-50.

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