| 摘要 |
PURPOSE:To eliminate the need for a one-frame delay circuit by using an elastic memory for frame aligner as the one-frame delay circuit for multi-point monitor in common. CONSTITUTION:A 1st selection circuit 5 selects the position B for the state of synchronizing step-out by the control of a frame synchronization protection circuit 2 and selects a write reset signal caused once per frame generated by decoding an output of a one-frame counter 4 at a decoding circuit 9. Moreover, 2nd and 3rd selection circuits 6, 7 select the position B by the control of the protective circuit 2 in the state of the synchronizing step-out and select a read reset signal and a reception clock read by an elastic memory 1 at one-frame delay with respect to the write reset signal from the counter 4. Then the protective circuit 2 establishes frame synchronization by controlling the frame synchronizing counter 3 based on an output of the memory 1 subjected to 1 frame delay and a received data. |
