Datasheet

DS26521 Single T1/E1/J1 Transceiver
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Register Name:
RCR1 (T1 Mode)
Register Description:
Receive Control Register 1
Register Address:
081h
Bit # 7 6 5 4 3 2 1 0
Name SYNCT RB8ZS RFM ARC SYNCC RJC SYNCE RESYNC
Default 0 0 0 0 0 0 0 0
Note: This register has an alternate definition for E1 mode. See RCR1.
Bit 7: Sync Time (SYNCT).
0 = qualify 10 bits
1 = qualify 24 bits
Bit 6: Receive B8ZS Enable (RB8ZS).
0 = B8ZS disabled
1 = B8ZS enabled
Bit 5: Receive Frame Mode Select (RFM).
0 = ESF framing mode
1 = D4 framing mode
Bit 4: Auto Resync Criteria (ARC).
0 = resync on OOF or LOS event
1 = resync on OOF only
Bit 3: Sync Criteria (SYNCC).
In D4 Framing Mode:
0 = search for Ft pattern, then search for Fs pattern
1 = cross couple Ft and Fs pattern
In ESF Framing Mode:
0 = search for FPS pattern only
1 = search for FPS and verify with CRC6
Bit 2: Receive Japanese CRC-6 Enable (RJC).
0 = use ANSI:AT&T:ITU-T CRC-6 calculation (normal operation)
1 = use Japanese standard JT-G704 CRC-6 calculation
Bit 1: Sync Enable (SYNCE).
0 = auto resync enabled
1 = auto resync disabled
Bit 0: Resynchronize (RESYNC). When toggled from low to high, a resynchronization of the receive-side framer is
initiated. Must be cleared and set again for a subsequent resync.