| 摘要 |
In a reception circuit, a frame status signal indicating whether frame synchronization is established is output from a frame synchronizing circuit to a frame counter circuit. When the frame synchronization is established, a timing signal synchronized with a reception frame pulse is output from the frame counter circuit. When the frame synchronization is not established or out of synchronization, a built-in frame counter is operated in a flywheel mode to output a timing signal to synchronize a baseband circuit and an I/F buffer circuit, so that communication with an external circuit can be kept normal irrespective of presence or absence of frame synchronization.
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