XRT72L13 Datasheet, PDF (125/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

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PRELIMINARY
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC XRT72L13
REV. 1.0.6
Setting this bit-field to “1” enables this loop-back
mode. Conversely, setting this bit-field to “0” disables
this loop-back mode.
Bit 5 - Loop-back Activation - DS1 Channel 1
This “Read/Write” bit-field permits the user to config-
ure DS1 Channel 1 into Remote Loop-back Mode.
When this loop-back is configured, then the
“RxDS1Data_1” signal will internally be “looped-back”
into the “TxDS1Data_1” path. Further, the
“RxDS1Clock_1” clock signal will also be internally
looped back into the “RxDS1Clock_1” signal path.
Setting this bit-field to “1” enables this loop-back
mode. Conversely, setting this bit-field to “0” disables
this loop-back mode.
Bit 4 - Loop-back Activation - DS1 Channel 0
This “Read/Write” bit-field permits the user to config-
ure DS1 Channel 0 into Remote Loop-back Mode.
When this loop-back is configured, then the
“RxDS1Data_0” signal will internally be “looped-back”
into the “TxDS1Data_0” path. Further, the
“RxDS1Clock_0” clock signal will also be internally
looped back into the “RxDS1Clock_0” signal path.
Setting this bit-field to “1” enables this loop-back
mode. Conversely, setting this bit-field to “0” disables
this loop-back mode.
Bit 3 - Loop-back Request - DS1 Channel 3
This “Read/Write” bit-field permits the user to config-
ure the XRT72L13 to transmit a “DS1 Channel 3 -
Loop-back Request” signal to the Remote Terminal
Equipment. When the Remote Terminal Equipment
receives this request, it is expected to respond by
configuring its own DS1 Channel 3 signal into Loop-
back Mode.
NOTE: This bit-field is ignored if the XRT72L13 has been
configured to operate in the “ITU-T G.747” Mode.
Bit 2 - Loop-back Request - DS1 Channel 2
This “Read/Write” bit-field permits the user to config-
ure the XRT72L13 to transmit a “DS1 Channel 2 -
Loop-back Request” signal to the Remote Terminal
Equipment. When the Remote Terminal Equipment
receives this request, it is expected to respond by
configuring its own DS1 Channel 2 signal into Loop-
back Mode.
NOTE: This bit-field is ignored if the XRT72L13 has been
configured to operate in the “ITU-T G.747” Mode.
Bit 1 - Loop-back Request - DS1 Channel 1
This “Read/Write” bit-field permits the user to config-
ure the XRT72L13 to transmit a “DS1 Channel 1 -
Loop-back Request” signal to the Remote Terminal
Equipment. When the Remote Terminal Equipment
receives this request, it is expected to respond by
configuring its own DS1 Channel 1 signal into Loop-
back Mode.
NOTE: This bit-field is ignored if the XRT72L13 has been
configured to operate in the “ITU-T G.747” Mode.
Bit 0 - Loop-back Request - DS1 Channel 0
This “Read/Write” bit-field permits the user to config-
ure the XRT72L13 to transmit a “DS1 Channel 0 -
Loop-back Request” signal to the Remote Terminal
Equipment. When the Remote Terminal Equipment
receives this request, it is expected to respond by
configuring its own DS1 Channel 0 signal into Loop-
back Mode.
NOTE: This bit-field is ignored if the XRT72L13 has been
configured to operate in the “ITU-T G.747” Mode.
2.3.2.39 M12 DS2 # 2 Loopback Request Regis-
ter )
M12 DS2 # 2 LOOP-BACK REGISTER (ADDRESS = 0X29)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Loop-back Loop-back Loop-back Loop-back Loop-back Loop-back Loop-back Loop-back
Activation Activation Activation Activation
Request
Request
Request
Request
DS1 Channel DS1 Channel DS1 Channel DS1 Channel DS1 Channel DS1 Channel DS1 Channel DS1 Channel
7
6
5
4
7
6
5
4
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Bit 7 - Loop-back Activation - DS1 Channel 7
This “Read/Write” bit-field permits the user to config-
ure DS1 Channel 7 into Remote Loop-back Mode.
When this loop-back is configured, then the
“RxDS1Data_7” signal will internally be “looped-back”
into the “TxDS1Data_7” path. Further, the
“RxDS1Clock_7” clock signal will also be internally
looped back into the “RxDS1Clock_7” signal path.
Setting this bit-field to “1” enables this loop-back
mode. Conversely, setting this bit-field to “0” disables
this loop-back mode.
NOTE: This bit-field is ignored if the XRT72L13 has been
configured to operate in the “ITU-T G.747” Mode.
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