| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem that an optimal phase change may not be performed upon a succeeding signal if it is set to perform the phase change on the basis of a signal when a phase is affected by jitter or noise considerably. <P>SOLUTION: In a phase determination apparatus 101 which determines a phase of an operating clock DQS1 from a system clock SCLK1 and the operating clock DQS1 of a device 1, the phase is notified to a noise determination section 103 for determining whether or not the phase of the operating clock DQS1 is affected by noise or jitter. The noise determination section 103 stores one or more phase signals of the operating clock DQS1 notified in the past, it is determined based on the history in the past whether or not phase information Ph1 is affected by great jitter or noise, and a signal Ph2 indicative of correct phase information is notified to the phase determination apparatus 101. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
