Serial interface amplitude selection for a disk drive in an unknown interconnect environment
US7366641B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2005 |
| Grant date | Apr 29, 2008 |
| Priority date | — |
| Expiry date | Dec 14, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D10/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A disk drive including a disk, a signal measurement circuit to measure amplitudes of signals received from the host, and a processor for controlling operations in the disk drive. The processor under the control of a program in conjunction with the signal measurement circuit: measures an amplitude of a signal from a host during a first speed negotiation process and determines if the amplitude of the signal from the host is above a pre-determined amplitude for the disk drive. If so, the processor commands the disk drive to transmit the signals to the host at the measured amplitude of the first speed negotiation process. However, if the amplitude is below the pre-determined amplitude for the disk drive, a second speed negotiation process is forced using a low frequency signal from the host and calculations are performed to determine appropriate transmit amplitudes for the interconnect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.