XRT75L04D Datasheet, PDF (16/98 Pages) Exar Corporation – FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

XRT75L04D
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FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER REV. 1.0.1
CONTROL AND ALARM INTERFACE
94
LLB_0
103
LLB_1
127
LLB_2
118
LLB_3
I Local Loop-back - Channel 0:
Local Loop-back - Channel 1:
Local Loop-back - Channel 2:
Local Loop-back - Channel 3:
This input pin along with RLB_n configures different Loop-Back modes.
A "High" on this pin with RLB_n set to "Low" configures Channel_n to operate
in the Analog Local Loop-back Mode.
A "High" on this pin with RLB_n set to "High" configures Channel_n to operate
in the Digital Local Loop-back Mode.
NOTE: This input pin is ignored and should be connected to GND if the
XRT75L04D is operating in the HOST Mode.
95
RLB_0
104
RLB_1
126
RLB_2
117
RLB_3
I Remote Loop-back - Channel 0:
Remote Loop-back - Channel 1:
Remote Loop-back - Channel 2:
Remote Loop-back - Channel 3:
This input pin along with LLB_n configures different Loop-Back modes.
A "High" on this pin with LLB_n set to “Low" configures Channel_n to operate in
the Remote Loop-back Mode.
A "High" on this pin with LLB_n set to "High" configures Channel_n to operate
in the Digital Local Loop-back Mode.
RLB_n
0
0
1
1
LLB_n
0
1
0
1
Loopback Mode
Normal Operation
Analog Local
Remote
Digital
NOTE: This input pin is ignored and should be connected to GND if the
XRT75L04D is operating in the HOST Mode.
OPERATING MODE SELECT
PIN #
134
SIGNAL NAME
HOST/(HW)
TYPE
I
DESCRIPTION
HOST/Hardware Mode Select:
Tie this pin “High” to configure in HOST mode. Tie this “Low” to configure in
Hardware mode.
When configured in HOST mode, the states of many of the discrete input pins
are controlled by internal register bits.
NOTE: This pin is internally pulled up.
12