Patent ID: 6970529
Filing Date: 2005-11-29
Classification: H03L,H04L

Abstract:
1. A unified system for transmitting and receiving data by a serial link across wired media, and comprising a transmitter and a receiver, the transmitter comprising: a) phase locked loop control circuit having a digital coarse loop and an analog fine loop, the coarse loop including a reference generator, a voltage comparator, a PLL control logic, a digital to analog counter and a low pass filter; b) a two-stage voltage regulated ring oscillator controlled by the phase locked loop, and capable of running at full bit frequency; c) a frequency reference operating at one-fourth of full data rate; d) a reference clock and a phase locked loop clock; the fine loop control formed by a 4x frequency divider, a phase-frequency detector, a charge pump and a loop file; and the receiver comprising a phase locked loop including a voltage controlled oscillator, a phase rotator independent of the phase locked loop and adapted to receive the output phases of the oscillator, a phase rotator control state machine for controlling the phase setting of a phase rotator and employing an over sampled half-rate system using a digitized early-late control.