Serial interface amplitude selection for a disk drive in an unknown interconnect environment
US8145452B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 2011 |
| Grant date | Mar 27, 2012 |
| Priority date | — |
| Expiry date | Aug 2, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D10/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A disk drive including a method for determining an amplitude for signal transmission over an interconnect is disclosed. The drive includes a processor that is coupled to a signal measurement circuit and is under the control of a program in conjunction with the signal measurement circuit to transmit a first signal to the host over a transmission medium at a first transmission frequency according to a first speed negotiation process, receive a second signal from the host at the first transmission frequency, determine a first voltage amplitude of the second signal, transmit a third signal to the host at a second transmission frequency according to a second speed negotiation process, receive a fourth signal from the host at the second transmission frequency, determine a second voltage amplitude of the fourth signal, and determine an approximate voltage loss in response to the first and second voltage amplitudes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.