PCI bus hard disk activity LED circuit

Details PCI bus hard disk activity LED circuit PCI bus hard disk activity LED circuit

1997-03-04

1998-06-02

Harvey, Jack B.

395835, 395836, 395281, H01J 300

Patent

active

057615276

ABSTRACT:
A computer system which includes a circuit to monitor the PCI bus master grant lines and provide a disk drive activity signal if an appropriate grant line is activated. The PCI bus master grant lines are combined with mask signals, so that the grant lines not associated with a PCI bus master such as a SCSI controller are ignored. If an unmasked grant line is activated, a down counter is loaded. While the counter is at a non-zero value, a disk drive activity signal is provided. This disk drive activity signal is combined with other disk drive activity signals to drive the disk drive activity LED.

REFERENCES:
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patent: 5377357 (1994-12-01), Mishigaki et al.
patent: 5455954 (1995-10-01), Packer
patent: 5471590 (1995-11-01), Melo et al.
patent: 5506997 (1996-04-01), Maguite et al.

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