XRT72L13 Datasheet, PDF (130/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13 MULTIPLEXER/FRAMER IC
REV. 1.0.6
áç
PRELIMINARY
Bit 1 - Loop-back Request - DS1 Channel 17
This “Read/Write” bit-field permits the user to config-
ure the XRT72L13 to transmit a “DS1 Channel 17 -
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 17 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 16
This “Read/Write” bit-field permits the user to config-
ure the XRT72L13 to transmit a “DS1 Channel 16 -
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 16 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.
2.3.2.43 M12 DS2 # 6 Loopback Request Regis-
ter )
M12 DS2 # 6 LOOP-BACK REGISTER (ADDRESS = 0X2D)
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
23
22
21
20
23
22
21
20
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 23
This “Read/Write” bit-field permits the user to config-
ure DS1 Channel 23 into Remote Loop-back Mode.
When this loop-back is configured, then the
“RxDS1Data_23” signal will internally be “looped-
back” into the “TxDS1Data_23” path. Further, the
“RxDS1Clock_23” clock signal will also be internally
looped back into the “RxDS1Clock_23” 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.
Bit 6 - Loop-back Activation - DS1 Channel 22
This “Read/Write” bit-field permits the user to config-
ure DS1 Channel 22 into Remote Loop-back Mode.
When this loop-back is configured, then the
“RxDS1Data_22” signal will internally be “looped-
back” into the “TxDS1Data_22” path. Further, the
“RxDS1Clock_22” clock signal will also be internally
looped back into the “RxDS1Clock_22” 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 5 - Loop-back Activation - DS1 Channel 21
This “Read/Write” bit-field permits the user to config-
ure DS1 Channel 21 into Remote Loop-back Mode.
When this loop-back is configured, then the
“RxDS1Data_21” signal will internally be “looped-
back” into the “TxDS1Data_21” path. Further, the
“RxDS1Clock_21” clock signal will also be internally
looped back into the “RxDS1Clock_21” 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 20
This “Read/Write” bit-field permits the user to config-
ure DS1 Channel 20 into Remote Loop-back Mode.
When this loop-back is configured, then the
“RxDS1Data_20” signal will internally be “looped-
back” into the “TxDS1Data_20” path. Further, the
“RxDS1Clock_20” clock signal will also be internally
looped back into the “RxDS1Clock_20” 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 23
This “Read/Write” bit-field permits the user to config-
ure the XRT72L13 to transmit a “DS1 Channel 23 -
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 23 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 22
118