Automatic alignment of a synchronous data system using a local r

Details Automatic alignment of a synchronous data system using a local r Automatic alignment of a synchronous data system using a local r

1986-09-29

1988-11-01

Pellinen, A. D.

Pulse or digital communications

Spread spectrum

Direct sequence

375107, 375111, 375118, 3408252, H04L 706

Patent

active

047824999

ABSTRACT:
An alignment circuit for use in a synchronous data transfer system for logically comparing the phase of a returned clock signal having an unknown phase relative to a local clock such that the local clock or its inverse can be used to retime returned remote data without the possibility of generating errors due to the lack of set-up time and hold time requirements for actuating a D flip-flop gate at its clock input with respect to the data arriving a the D input of the D flip-flop. The phase of the local clock relative to the return clock is detected and compared with a threshold phase shift value. If the phase shift is negligible, the remote data is clocked by the inverted local clock. If the phase shift exceeds the threshold value, the remote data is clocked by the local clock.

REFERENCES:
patent: 4651103 (1987-03-01), Grimes

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