Interrupt controller in an interface device or information...

Details Interrupt controller in an interface device or information... Interrupt controller in an interface device or information...

2005-01-04

2005-01-04

Myers, Paul R. (Department: 2111)

Electrical computers and digital processing systems: support

Synchronization of clock or timing signals, data, or pulses

C710S262000, C710S306000, C710S301000, C710S049000

Reexamination Certificate

active

06839857

ABSTRACT:
There is disclosed an interface device which can prevent the freezing of an information processing system caused occupation of a system bus even when a wait signal outputted from the PC card is kept asserted. When the wait signal outputted from the PC card, is asserted, a timer portion201is activated. When the timer portion201detects that the wait signal is kept asserted for more than a predetermined period of time, it asserts a wait mask signal. Upon assertion of the wait mask signal, a mask portion202masks the wait signal from the PC card so that the wait signal to the CPU is negated even when the wait signal is kept asserted. Further, when the timer portion201asserts the wait mask signal, an interrupt control block/card status register210asserts an interrupt signal to the CPU.

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