公开(公告)号：JPH0382222A

公开(公告)日：1991-04-08

申请号：JP15009290

申请日：1990-06-11

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUNICATION

Inventor： DON KUWAN SHIN

IPC: H03L7/06 ,  H03K7/06 ,  H03L7/081 ,  H03L7/089 ,  H04J3/06 ,  H04L7/00 ,  H04L7/033 ,  H04L25/40

Abstract: PURPOSE: To prevent the retiming errors by setting automatically the significant instant of a retiming clock at the center of a data eye pattern. CONSTITUTION: A negative feedback digital circuit consists of a phase detection/ retiming unit U1, a loop processor U2 and a phase shifter U3. Then the significant instant of a retiming clock is set at the center of a data eye pattern in a steady state. When an operation is started with the significant instant set in a data transition, the transition state is switched to the steady state and the significant instant of an inverted retiming clock is set at the data transition edge. Thus, the retiming errors can be eliminated.