Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1992-06-15
1994-05-17
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
375118, 307602, 371 1, H04L 2538
Patent
active
053135016
ABSTRACT:
In a computer system, parallel streams of digital data are transmitted from a source to a destination in bursts or packets. At the beginning of each burst all the parallel data signals contain a start bit. Each data signal is received by a deskewing buffer which transmits the data signal through a delay line with multiple taps. At the beginning of each clock cycle the signal value Data(i) at each tap (i) in the delay line is latched. Each resulting latched signal value LData(i) is compared with the latched signal value LData(i+1) for the next tap down the delay line to generate a set of comparison signals C(i). When the start bit of a new burst is received, one of the comparison signals will have a distinct value from all the others, thereby indicating the delay line tap at which the phase of the received data signal is approximately synchronized with the receiver's clock signal. The data stored in the deskewing buffer's latches represents the phase of the received digital signal and is retained until the end of the burst transmission. A multiplexer which outputs a selected one of data signals from the tapped delay line in accordance with the values of the comparison signals. The selected data signal is sampled and latched at each clock cycle, thereby generating a deskewed data signal that is synchronized with both the receiver's clock signal and also with the other parallel data streams.
REFERENCES:
patent: 3518625 (1970-06-01), Agin
patent: 4637018 (1987-01-01), Flora et al.
patent: 4700347 (1987-10-01), Rettberg et al.
patent: 4755704 (1988-07-01), Flora et al.
patent: 4841551 (1989-06-01), Avaneas
patent: 4977582 (1990-12-01), Nichols et al.
Bocure Tesfaldet
Chin Stephen
Digital Equipment Corporation
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