XRT83VSH316_07 Datasheet, PDF (78/97 Pages) Exar Corporation – 16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

XRT83VSH316
16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
TABLE 44: MICROPROCESSOR REGISTER 0XN01H BIT DESCRIPTION
CHANNEL N (0XN01H)
BIT
NAME
FUNCTION
Register
Type
Default
Value
(HW reset)
D7
RxTSEL Receive Termination Select
R/W
0
Upon power up, the receiver is in "High" impedance. RxTSEL is
used to switch between the internal termination and "High" imped-
ance.
0 = External Termination
1 = Internal Termination
D6
TxTSEL Transmit Termination Select
R/W
0
Upon power up, the transmitter is in "High" impedance. TxTSEL is
used to switch between the internal termination and "High" imped-
ance.
0 = "High" Impedance
1 = Internal Termination
D5
TERSEL1 Receive Line Impedance Select
R/W
0
D4
TERSEL0 TERSEL[1:0] are used to select the line impedance for T1/J1/E1.
0
TERSEL1
0
0
1
1
TERSEL0
0
1
0
1
LINE IMPEDANCE
100Ω
110Ω
75Ω
120Ω
D3
JASEL1 Jitter Attenuator Select
R/W
0
D2
JASEL0 JASEL[1:0] are used to enable the jitter attenuator in the receive or
transmit path. By default, the jitter attenuator is disabled.
JASEL1 JASEL0
0
0
0
1
1
0
1
1
JA PATH
Disabled
Transmit Path
Receive Path
Receive Path
75