Patent ID: 6937681
Filing Date: 2005-08-30
Classification: H04L

Abstract:
1. A skew correction apparatus receiving a plurality of serial data through a plurality of channels and reducing the skew amount constituting a phase shift between a plurality of said serial data, comprising: first skew correction means for detecting the skew between a plurality of said serial data during an idle time when no data is transmitted and correcting the delay amount of each of a plurality of said serial data in such a manner as to reduce said skew amount; and second skew correction means for detecting the skew amount generated between a plurality of said serial data during the transmission of the data corrected by said first correction means and correcting the skew amount of each of a plurality of said serial data in such a manner as to reduce the skew amount to zero, wherein; said first skew correction means comprises an idle state detection circuit for detecting an idle state and a primary skew correction circuit for correcting the delay amount of each of a plurality of said serial data by a primary skew correction at the time of detecting said idle state, and said second skew correction means comprises a skew monitor circuit monitoring the skew amount during the transmission of a plurality of said serial data having a delay amount corrected by said primary skew correction circuit, and a delay adjust circuit correcting the delay amount of each of a plurality of said serial data in such a manner that the skew amount detected by the skew monitor circuit is reduced to zero.