Electrical pulse counters – pulse dividers – or shift registers: c – Shift register – Particular input circuit
Patent
1982-06-17
1985-01-22
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Shift register
Particular input circuit
377 73, 377 79, 377 81, 377117, 324 73AT, 307272A, G11C 1928
Patent
active
044956282
ABSTRACT:
A CMOS LSI or VLSI integrated circuit chip includes a shift register circuit that provides internal delay testing capability. The shift register circuit is disposed around the periphery of the chip and includes a large number of serially connected stages. One mode of operation allows a data signal to pass through the shift register circuit at a speed limited only by the propagation delays associated with the individual stages thereof. In this mode of operation, one net inversion is introduced into the data path and the output of a final stage of the shift register circuit is coupled to the input of a first stage of the shift register circuit, thereby creating a ring oscillator. The period of oscillation of this ring oscillator represents a measure of the average propagation delay times associated with the various circuit elements employed within the LSI or VLSI circuitry. Such delay measurements can readily be made at any level of packaging or system operation.
REFERENCES:
patent: 4139818 (1979-02-01), Schneider
patent: 4156288 (1979-05-01), Spandorfer
patent: 4329640 (1982-05-01), Reiner et al.
patent: 4435806 (1984-03-01), Segers et al.
Gold Bryant R.
Heyman John S.
Storage Technology Partners
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