Integrated circuit containing scan circuit

Details Integrated circuit containing scan circuit Integrated circuit containing scan circuit

1992-07-02

1994-11-22

Callahan, Timothy P.

Electrical pulse counters, pulse dividers, or shift registers: c

Shift register

Particular transfer means

377 77, 377 81, 377106, G11C 700

Patent

active

053675517

ABSTRACT:
An integrated circuit is provided for reducing scale of flip-flops which can be connected in the form of a shift register by the switching operation, in order to facilitate the test during the manufacture of an integrated circuit (gate array). One selector for switching a clock signal for the flip-flops to either of a system clock signal and a scan clock signal is provided not for each of the sequential circuits, but for each of the clock systems for these sequential circuits. In a case of a gate array, for example, this allows a reduction of three gates for each flip-flop to be realized.

REFERENCES:
patent: 3496475 (1970-02-01), Arnold
patent: 3636376 (1972-01-01), Hoffmann
patent: 4509183 (1985-04-01), Wright
patent: 5198999 (1993-03-01), Abe et al.

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