System and method for providing scan chain for digital electroni

Details System and method for providing scan chain for digital electroni System and method for providing scan chain for digital electroni

1996-11-21

1999-06-01

Chung, Phung M.

Excavating

371 221, 371 2236, H04B 1700

Patent

active

059094516

ABSTRACT:
A digital electronic circuit device comprises a plurality of circuit elements, a scan chain establishment element, and a unitary clock domain establishment element. The plurality of circuit elements define a plurality of clock domains, and circuit elements in each clock domain perform processing operations under control of a respective domain clock signal. The scan chain establishment element interconnects the circuit elements in a scan chain to facilitate loading and/or retrieval of a scan vector into and/or out of the digital circuit device. The unitary clock domain establishment element establishes a unitary clock domain for the circuit element when the scan chain establishment element is interconnecting the circuit elements in a scan chain. Thus, the scan vector will be loaded into or retrieved from the digital electronic circuit device using the single, unitary clock signal, thereby avoiding any necessity of using synchronizers or other elements for the scan chain which can complicate layout of the device.

REFERENCES:
patent: 5592493 (1997-01-01), Crouch et al.
patent: 5719878 (1998-02-01), Yu et al.

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