Communication device and method of correcting the same

• US 8,117,511 B2
• Filed: 03/25/2009
• Issued: 02/14/2012
• Est. Priority Date: 03/31/2008
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: Yamauchi, Satomi
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): Huang, Weibin
• Application Number:
  US12/410,777
• Publication Number:
  US 20090245231A1
• Time in Patent Office: 1,056 Days
• Field of Search: 370/310, 370/345, 370/350, 340/1.1, 340/3.1, 340/3.2, 714/699, 714/724, 714/726, 714/731
• US Class Current: 714/731
• CPC Class Codes: H04J 3/0685 Clock or time synchronisation in a node; Intranode synchronisation

Abstract

A communication device includes a reference clock generator that generates a first reference clock signal, and a super frame timer that clocks a period of super frame based on the first reference clock signal generated by the reference clock generator. The communication device further includes a physical layer that performs wireless communication and generates a second reference clock signal, and a timer correcting part that corrects an error in the clocking in the super frame timer based on the first reference clock signal generated by the reference clock generator and the second reference clock signal generated by the physical layer.

Claims

1. A communication device, comprising:

a reference clock generator that generates a first reference clock signal;

a super frame timer that clocks a period of super frame based on the first reference clock signal generated by the reference clock generator;

a physical layer that performs wireless communication and generates a second reference clock signal; and

a timer correcting part that corrects an error in the clocking in the super frame timer based on the first reference clock signal generated by the reference clock generator and the second reference clock signal generated by the physical layer,

wherein the timer correcting part corrects the error by correcting a ratio value that is a ratio of a natural period of the super frame timer and the first reference clock signal.

2. The communication device according to claim 1, wherein

the physical layer comprises a register, and

the timer correcting part corrects the ratio value based on an access time that the first reference clock signal from the reference clock generator accesses the register and an access time that the second reference clock signal from the physical layer accesses the register.

3. A method of correcting a communication device, the method comprising:

generating a first reference clock signal;

clocking a period of super frame based on the first reference clock signal;

performing wireless communication and generating a second reference clock signal by a physical layer; and

correcting an error in the clocking based on the first reference clock signal and the second reference clock signal,

wherein the timer correcting part corrects the error by correcting a ratio value that is a ratio of a natural period of the super frame timer and the first reference clock signal.

4. The method of correcting the communication device according to claim 3, wherein

the physical layer comprises a register, and

the correcting corrects the ratio value based on an access time that the first reference clock signal accesses the register and an access time that the second reference clock signal accesses the register.