Datasheet

DS26518 8-Port T1/E1/J1 Transceiver
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Register Name:
RCR1 (E1 Mode)
Register Description:
Receive Control Register 1
Register Address:
081h + (200h x (n - 1)) : where n = 1 to 8
Bit # 7 6 5 4 3 2 1 0
Name — RHDB3 RSIGM RG802 RCRC4 FRC SYNCE RESYNC
Default 0 0 0 0 0 0 0 0
Note: This register has an alternate definition for T1 mode. See RCR1.
Bit 6: Receive HDB3 Enable (RHDB3)
0 = HDB3 disabled.
1 = HDB3 enabled (decoded per O.162).
Bit 5: Receive Signaling Mode Select (RSIGM)
0 = CAS signaling mode.
1 = CCS signaling mode.
Bit 4: Receive G.802 Enable (RG802). See
Figure 11-30 for details.
0 = Do not force RCHBLKn high during bit 1 of time slot 26.
1 = Force RCHBLKn high during bit 1 of time slot 26.
Bit 3: Receive CRC-4 Enable (RCRC4)
0 = CRC-4 disabled.
1 = CRC-4 enabled.
Bit 2: Frame Resync Criteria (FRC)
0 = Resync if FAS received in error three consecutive times.
1 = Resync if FAS or bit 2 of non-FAS is received in error three consecutive times.
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.