XRT81L27 Datasheet, PDF (19/30 Pages) Exar Corporation – SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY

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XRT81L27
SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY
REV. 1.1.0
BIT #.
0-6
TABLE 11: LOCAL LOOP-BACK REGISTERS - ADDRESS: 0001, HEX 0X01
NAME
FUNCTION
LLB0-LLB6
Local Loop-Back:
Writing a "1" to this bit enables Local Loop-back for the channel(s) selected.
During Local loop-back, transmit input data continues to be sent to the line
unless overridden by TAOS control.
REGISTER TYPE
R/W
BIT #.
0-6
TABLE 12: REMOTE LOOP-BACK REGISTERS - ADDRESS: 0010, HEX 0X02
NAME
FUNCTION
RLB0-RLB6
Remote Loop-back:
Wring a "1" to this bit enables Remote Loop-back for the channel(s)
selected. During Remote Loop-back, receive output data is available at
RPOS/RNEG unless overridden by RAOS request
REGISTER TYPE
R/W
BIT #.
0-6
TABLE 13: ANALOG LOOP-BACK REGISTERS - ADDRESS: 0011, HEX 0X03
NAME
ALB0-ALB6
FUNCTION
REGISTER TYPE
Analog Loop-back:
R/W
Writing a “1” to this bit enables Analog Local Loop-back for the channel(s)
selected. Analog Loop-back ignores input data on RTIP and RRING and
internally routes data at TTIP and TRING back to the receive input. This
loop-back mode exercises most of the functional blocks of the channel. Ana-
log Loop-back has priority over other Loop-back, TAOS and RAOS requests.
TABLE 14: TAOS REGISTERS - ADDRESS: 0100, HEX 0X04
BIT #.
NAME
FUNCTION
REGISTER TYPE
0-6 TAOS0-TAOS6 Transmit All Ones
R/W
Writing a "1" to this bit enables an AMI encoded all ones data to be transmit-
ted to the line for the channel(s) selected. Transmit input data is ignored
when TAOS bit is set. Remote Loop-Back has priority over TAOS request.
BIT NO.
0-6
NAME
RAOS0-
RAOS6
TABLE 15: RAOS REGISTERS - ADDRESS: 0101, HEX 0X05
FUNCTION
REGISTER TYPE
Receive All Ones:
R/W
Writing a "1" to this bit enables all ones data to be inserted on the receive side
for the channel(s) selected. In Single-Rail mode, all ones data is a continuous
"High" signal at RPOS output and in Dual-Rail mode, a "1010" pattern is sent
to RPOS and RNEG while the receive input signal at RRTIP and RRING is
ignored. Local Loop-Back has priority over RAOS and ARAOS request.
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