XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 81

• Manufacturer Part Number: XRT84L38IB
• Description: Network Controller & Processor ICs 8 Ch T1/E1 Framer
• Manufacturer: Exar Corporation

Specifications of XRT84L38IB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

REV. 1.0.1
Line Interface Control Register (LICR) - T1 Mode (Indirect Address = 0xn0H, 0x01H)
B
Transmit
IT
Force
B
LOS
R/W
N
IT
0
UMBER
7
6
7
Force Transmit LOS
NRZ Rail Select
NRZ Rail
Select
B
R/W
IT
0
6
B
IT
N
AME
Select Bit 1
Loop-back
B
R/W
IT
0
5
B
IT
R/W
R/W
Select Bit 0
Loop-back
T
YPE
B
R/W
IT
0
4
Force Transmit LOS:
This READ/WRITE bit-field forces the framer to transmit Loss of
Signal (LOS) onto the LIU interface.
When this bit is set to one:
The framer is forced to transmit an LOS signal onto the LIU inter-
face outputs.
NRZ Rail Select:
This READ/WRITE bit-field permits the user to select how data
are transmitted to and received from the LIU.
When this bit is set to zero:
The framer is operating in dual-rail mode. The TxPOS pin is car-
rying the positive data and the TxNEG pin is carrying the nega-
tive data. The positive and the negative data combined represent
the entire data stream going to the LIU.
The received data from the LIU will also be bipolar, that is, the
positive data received from RxPOS and the negative data
received from RxNEG combined represent the entire data
stream.
When this bit is set to one:
The framer is operating in single-rail mode. The TxPOS pin is
carrying the entire data stream. The TxNEG pin is carrying the
Multi-frame Synchronization Pulse.
The received data from the LIU will also be single-railed. The
RxPOS pin is carrying the entire data stream going into the
framer from LIU.
61
Line Clock
Inversion
Transmit
B
R/W
IT
0
3
Receive Line
Inversion
B
Clock
B
R/W
IT
IT
0
D
2
ESCRIPTION
OCTAL T1/E1/J1 FRAMER
Transmit
Enable
B8ZS
B
R/W
IT
0
1
XRT84L38
Receive
Enable
B8ZS
B
R/W
IT
0
0