Logic module for integrated digital circuits

Details Logic module for integrated digital circuits Logic module for integrated digital circuits

1980-02-11

1983-03-22

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307465, 324 73R, 307220R, H03K 3335, H03K 2100

Patent

active

043777570

ABSTRACT:
A logic module is disclosed for construction in an integrated digital circuit for promoting testing of the integrated circuit. A latch module is provided for functioning as a latch, as a back-coupled shift register, and in one embodiment of the invention as a linear shift register. The latch module is formed of a plurality of basic cells each of which has a flip-flop with associated logic gates, one of which is an exclusive OR gate. The latch module also has an input, parallel data inputs and parallel data data outputs. For functioning in the back-coupling mode, an exclusive OR gate is connected between at least one of the flip-flops and the input to the latch module.

REFERENCES:
patent: 3007115 (1961-10-01), Batley
patent: 3924144 (1975-12-01), Hadamard
patent: 3950705 (1976-04-01), Fuerherm
patent: 4054788 (1977-10-01), Maitland et al.
patent: 4139818 (1979-02-01), Schneider
M. J. Y. Williams et al., "Enhancing Testability of Large Scale Integrated Circuits Via Test Points and Additional Logic", IEEE Trans. Computers C-22, pp. 46-60, 1973.
R. A. Frohwerk, "Signature Analysis: A New Digital Field Service Method", Hewlett Packard Journal, pp. 2-8, May, 1977.

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