Patent · US Expired

High-speed single-ended interface

US7555048B1 · kind B1 · utility

14Cited by
7References
21Claims
0Family size

Assignee

Inventors

Key dates

Filing dateNov 24, 2004
Grant dateJun 30, 2009
Priority date
Expiry dateMay 4, 2026

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04L7/042
  • WIPO fieldDigital communication
  • WIPO sectorElectrical engineering

Abstract

Circuits, methods, and apparatus for transmitting, receiving, aligning and re-synchronizing high-speed single-ended signals by aligning a clock signal to one or more received data signals. A receiver amplifier circuit senses and captures low swing single ended signals at the receiver. Alignment is done on a per pin basis where a clock signal is distributed and independently phase shifted and aligned to each incoming data signal. In one example, a preamble containing a training data pattern is transmitted. The receiver steps through a number of dynamic timing alignment codes, each of which selects a different phase-shifted clock signal. The received data is examined for errors and the optimal clock signal is selected. Periodic dynamic readjustments of multiple clock alignment circuits may be made to compensate for temperature and voltage drift and variations.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.