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Notes)
• PCMD is an MSB first. two's complement output.
• GTOP is used to monitor the frame sync protection status. (High:sync protection window released)
• XUGF is the negative pulse for the frame sync derived from the EFM signal. It is the signal before sync protection.
• XPCK is the inverse of the EFM PLL clock. The PLL is designed so that the falling edge of XPCK and the EFM signal transition point coincide.
• GFS goes high when the frame sync and the insertion protection timing match.
• RFCK is derived with the crystal accuracy. This signal has a cycle of 136
µ
s.
• C2PO represents the data error status.
• XROF is generated when the 32K RAM exceeds the
±
28 Frame jitter margin.
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