XRT72L13 Datasheet, PDF (202/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC
REV. P1.0.6
áç
PRELIMINARY
OPERATING MODE REGISTER (ADDRESS = 0X00)
BIT 7
BIT 6
BIT 5
BIT 4
Local Loop- Line Loop- Internal LOS
back Mode back Mode
Enable
RESET
R/W
R/W
R/W
R/W
0
0
1
0
BIT 3
Interrupt
Enable
RESET
R/W
1
BIT 2
BIT 1
BIT 0
Frame Format TimRefSel[1] TimRefSel[0]
R/W
R/W
R/W
0
1
1
Bit 7 - Local Loop-back Mode
This bit-field permits the user to configure the
XRT72L13 M13 device to operate in the “Local Loop-
back” Mode.
Setting this bit-field to “1” configures the XRT72L13
M13 chip to operate in the “Local Loopback” Mode.
Setting this bit-field to “0” configures the XRT72L13
M13 chip to not operate in the “Local Loopback”
Mode.
Bit 4 - RESET
This “Read/Write” bit-field permits the user to com-
mand the XRT72L13 M13 chip into a software reset
state. If the XRT72L13 M13 chip is commanded into
the “RESET” state, all of its internal register bits will
automatically be set to their default condition.
The user can configure the XRT72L13 to operate in
the “RESET” state by inducing a “0” to “1” transition in
this bit-field.
Bit 6 - Line Loopback Mode
This bit-field permits the user to configure the
XRT72L13 M13 device to operate in the “Line Loop-
back” Mode.
Setting this bit-field to “1” configures the XRT72L13
M13 chip to operate in the “Line Loopback” Mode.
Setting this bit-field to “0” configures the XRT72L13
M13 chip to not operate in the “Line Loopback” Mode.
Bit 5 - Internal LOS Enable
This “Read/Write” bit-field permits the user to config-
ure the XRT72L13 M13 chip to either declare an LOS
(Loss of Signal) condition, based upon the “Internal
Circuit’s” criteria or not.
Setting this bit-field to “0” configures the XRT72L13
M13 chip to NOT declare an LOS condition, based
upon its own internal criteria.
Setting this bit-field to “1” configures the XRT72L13
LOS condition, based upon its own internal criteria.
NOTES:
1. The XRT72L13 M13 chip will declare an “LOS”
condition anytime the RLOS input pin is set “high”
independent of the setting of this bit-field.
2. For more information on the XRT72L13 M13 chip’s
“internal criteria” for “Loss of Signal” please see
Section _.
Bit 3 - Interrupt Enable RESET
This “Read/Write” bit-field permits the user to config-
ure the XRT72L13 M13 chip to automatically disable
all Interrupts that are activated.
Setting this bit-field to “0” configures the XRT72L13
M13 chip to NOT disable the Interrupt Enable Status”
of any interrupt following their activation.
Setting this bit-field to “1” configures the XRT72L13
M13 to disable the Interrupt Enable Status” of any in-
terrupt following their activation.
For more information on this feature, please see Sec-
tion _.
Bit 2 - Frame Format Select
This “Read/Write” bit-field permits the user to select
the Framing format that the XRT72L13 M13 device
will be operating in.
Setting this bit-field to “0” configures the XRT72L13
M13 device to operate in the C-Bit Parity Framing
Format.
Setting this bit-field to “1” configures the XRT72L13
M13 device to operate in the M13 Framing Format.
Bits 1 and 0 - TimRefSel[1:0] - Timing Reference
Select
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