Positive pulse format noise-filter and negative pulse format ext

Details Positive pulse format noise-filter and negative pulse format ext Positive pulse format noise-filter and negative pulse format ext

1992-10-02

1995-03-07

Ray, Gopal C.

Boots, shoes, and leggings

364941, 3649269, 364947, 3649472, 364942, 36494206, 364DIG2, G06F 1324, G06F 946

Patent

active

053966333

ABSTRACT:
A computer system includes a filter at an interrupt request input for a microprocessor system. The interrupt signal filter suppresses any positive pulse that is shorter than 9 cycles of the host clock. Only signals that are asserted for at least 17 HCLK cycles are guaranteed passage to the interrupt controller to assert the interrupt request. In addition, any negative pulse on the IRQ signal is latched and extended for at least 9 cycles of the host clock. The filter thus suppresses noise to prevent unnecessary interrupts, and provides for enhanced detection of negative levels and rising edges for negative-going interrupt request signals.

REFERENCES:
patent: 4038539 (1977-07-01), Van Cleave
patent: 4132954 (1979-01-01), Sidhu
patent: 4375084 (1983-02-01), Urushibata
patent: 4868742 (1989-09-01), Gant et al.
patent: 5179704 (1993-01-01), Jibbe et al.
patent: 5182803 (1993-01-01), Rodi et al.
Pal Code for Compaq Computer Corp. Ultima II Processor Board for Systempro Computers, Mar. 20, 1990.

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