Pulse or digital communications – Synchronizers
Patent
1993-11-17
1995-10-17
Chin, Stephen
Pulse or digital communications
Synchronizers
375375, 370105, 327142, 327155, 327163, 327141, H04L 700
Patent
active
054597528
ABSTRACT:
A simple digital method is disclosed for controlling the digital signals sent out from a pluralities of identical signal processors (i.e, signal generators) so as to achieve synchronization. The method comprises the steps of: (a) obtaining a gate array logic circuit containing a plurality of pairs of comparison terminals and reference terminals, each of the comparison terminals is connected to a respective signal processor and the reference terminals are respectively connected to at least two different signal processors; (b) performing a gate array logic circuit operation, which comprises the following sub-steps: (i) performing a waiting procedure for each pair of comparison terminal and reference terminal until it is received that the comparison terminal is "1" and the reference terminal is "0", then moving to a gate procedure; otherwise, continuing the waiting procedure (i.e., no disable signal is sent out); (ii) performing a gate procedure by continuously sending out a "1" gate signal, i.e., the gate being set at "1" state (i.e., disable signal), until a "1" signal is received at the reference terminal is "1", then moving to a reset procedure; (c) performing a reset procedure by sending out a "0" gate output, i.e., the output gate being set at "0" state, the reset procedures continues until the reference terminal is "0", then going back to said waiting procedure; wherein a "0" gate signal indicating that system synchronization is normal, thus no disable action is taken, and a "1" gate signal indicating that one of the signal generators connected to a specific comparison reference is too fast and a disable action is taken. No disable action is taken during either the "waiting" or the "resetting" procedure; however, only the waiting procedure can be switched to the gate procedure (i.e., a disable action being taken).
REFERENCES:
patent: 4613979 (1986-09-01), Kent
patent: 4807258 (1989-02-01), Seiber et al.
patent: 4876701 (1989-10-01), Sanner
patent: 5249206 (1993-09-01), Appelbaum et al.
patent: 5307381 (1994-04-01), Ahuja
Chin Stephen
Le Amanda T.
Liauh W. Wayne
Umax Data System Inc.
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