Write-control circuit for high-speed static random-access-memory

Details Write-control circuit for high-speed static random-access-memory Write-control circuit for high-speed static random-access-memory

1996-08-26

1998-06-09

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

327173, 327176, H03K 504

Patent

active

057640904

ABSTRACT:
A write-control circuit including a pulse processor and a waveform shifter is disclosed. The pulse processor is provided for processing a first waveform. When the first waveform has a bandwidth wider than a first delay, the waveform goes through the pulse processor without change. Otherwise, a second delay is added to trailing edge of the first waveform. The waveform shifter is provided for shifting the output waveform of the pulse processor as a second waveform. The pulse processor consists of a pulse generator, a trailing edge delay circuit, a NOR gate and an inverter. The pulse generator, which generates a finite-length pulse by the first waveform, includes a delay chain and a NAND gate. The delay chain may consist of an odd number of delay units. The trailing edge delay circuit includes an even number of delay units and a NAND gate for adding the second time delay to the trailing edge of the finite-length pulses. The output of the trailing edge delay circuit and the first waveform are both processed by the NOR gate, the inverter, and the waveform shifter to generate the second waveform.

REFERENCES:
patent: 5055706 (1991-10-01), Nakai et al.
patent: 5309034 (1994-05-01), Ishibashi
patent: 5396110 (1995-03-01), Houston
patent: 5546034 (1996-08-01), Han

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