| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an asynchronous signal sampling circuit, capable of transmitting larger amount of asynchronous data or of external data, enabling improvement of transmission efficiency. SOLUTION: With a timing pulse 106, a counter circuit 3 is triggered and counting is started. Upon input of an external asynchronous signal 101, a change point detector circuit 1 detects the change point of this signal 101 and transfers its change point pulse 105 to a counter circuit 3. Upon inputting of the pulse 105, the counter circuit 3 stops counting and transfers the counted value, up to this time to a coding circuit 4, which then codes the counted value and the polarity of the asynchronous signal 101 at the stoppage time and sends them out as a synchronization signal (#1) 102 at next time. An external data inserting circuit 5 inserts external data 104 in empty slots of the synchronization signal (#1) 102 and sends out them as a synchronous signal (#2) 103.</p> |
