US 2004/0071251 A1 · Clock offset compensator

Abstract

A device communicates with a host and includes a transmitter, a receiver and a clock generator that generates a local clock frequency. A clock recovery circuit communicates with the receiver and recovers a host clock frequency from data received from the host by the receiver. A frequency offset circuit communicates with the clock recovery circuit and the clock generator and generates a frequency offset based on the clock frequency and the recovered host clock frequency. A frequency compensator compensates a frequency of the transmitter using the frequency offset. The host and the device may communicate using a serial ATA standard. Frequency compensation can be performed during spread spectrum operation.

Claims57

Dependent claims

A device that communicates with a host, comprising:

a transmitter;
a receiver;
a clock generator that generates a local clock frequency;
a clock recovery circuit that communicates with said receiver and that recovers a host clock frequency from data received from said host by said receiver;
a frequency offset circuit that communicates with said clock recovery circuit and said clock generator and that generates a frequency offset based on said clock frequency and said recovered host clock frequency;
and
a frequency compensator that compensates a frequency of said transmitter using said frequency offset.

4 more elements

Dependencies are inferred from the claim text.

Clock offset compensator

Life of this patent

Clock offset compensator

Life of this patent

Abstract

Claims57