Sound warning circuit for PCI hot plug

Details Sound warning circuit for PCI hot plug Sound warning circuit for PCI hot plug

1998-07-06

1999-12-28

Wu, Daniel J.

Communications: electrical

Condition responsive indicating system

Specific condition

340650, 340651, 361752, 361753, 395280, 395283, G08B 2100

Patent

active

060087307

ABSTRACT:
A sound warning circuit for PCI hot plug basically comprises: a timer that takes as inputs a fixed frequency clock and the system port B's bit 0, and which controls the system; a logic AND gate that takes as inputs the timer output and the system port B's bit 1; a speaker driver that takes as an input the AND gate's output; and a speaker that operates based on the speaker driver. In a further embodiment, the timer takes as inputs a fixed frequency clock and either the system port B's bit 0 or a PCI card VDD input, while the AND gate takes as inputs the timer output and any one or more of the system port B's bit 1, a chassis ground cable 0 input, and a chassis ground cable 1 input. In a further embodiment, the AND gate takes as inputs the timer output and either the system port B's bit 1 input or the output of a D Flip-Flop, the latter having the chassis ground cable signal as an input and receiving a reset signal from an AND gate, the latter having as inputs a reset switch input and a system reset # input.

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