XRT83L314 Datasheet, PDF (59/84 Pages) Exar Corporation – 14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT

XRT83L314
14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
TABLE 27: MICROPROCESSOR REGISTER 0X02H BIT DESCRIPTION
BIT
NAME
CHANNEL 0-13 (0X02H-0XD2H)
FUNCTION
Register
Type
Default
Value
(HW reset)
D7
INVQRSS QRSS inversion
R/W
0
INVQRSS is used to invert the transmit QRSS pattern set by the
TxTEST[2:0] bits. By default, INVQRSS is disabled and the QRSS
will be transmitted with normal polarity.
0 = Disabled
1 = Enabled
D6
TxTEST2 Test Code Pattern
R/W
0
D5
TxTEST1 TxTEST[2:0] are used to select a diagnostic test pattern to the line
0
D4
TxTEST0 ^{(transmit outputs).}
0
0XX = No Pattern
100 = Tx QRSS
101 = Tx TAOS
110 = Tx TLUC
111 = Tx TLDC
D3
TxOn Transmit ON/OFF
R/W
0
Upon power up, the transmitters are powered off. This bit is used
to turn the transmitter for this channel On or Off if the TxON pin is
pulled "High". If the TxON pin is pulled "Low", all 14 transmitters
are powered off.
0 = Transmitter is Powered OFF
1 = Transmitter is Powered ON
D2
LOOP2 Loopback Diagnostic Select
D1
LOOP1 LOOP[2:0] are used to select the loopback mode.
D0
LOOP0 0XX = No Loopback
100 = Dual Loopback
101 = Analog Loopback
110 = Remote Loopback
111 = Digital Loopback
R/W
0
0
0
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