PCI bus hard disk activity LED circuit
US5623691A · kind A · utility
18Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1994 |
| Grant date | Apr 22, 1997 |
| Priority date | — |
| Expiry date | Nov 14, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B31/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.