| 摘要 |
<p>An apparatus (7) for synchronously transmitting data between devices operating at different frequencies that have a P/Q integer ratio relationship. The apparatus allows one or more device(s) operating at a high frequency (16) to synchronously exchange data with one or more device(s) operating at a low frequency (18). The frequency relationship is: low frequency = (P/Q) X high frequency; where P and Q represent integer values, P is less that Q, and Q is not necessarily an integer multiple of P. A clock generator (10) generates one or both of the frequency clocks according to the P/Q frequency ratio. The interface controller (12) receives the high (low) frequency clock and the P and Q values as inputs and generates a high-to low (low-to high) data transfer signal. Data transfer signals indicate safe times (a high frequency clock period with stable transfer data and the receiver ready) or windows for transferring data across frequency boundaries (14).</p> |
