XRT72L13 Datasheet, PDF (97/370 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 “0” configures the XRT72L13 to
operate in the “Dual-Rail” Mode. In this mode, the
“Transmit Section” of the XRT72L13 M13 device will
output data to the LIU via the “TxPOS” and “TxNEG”
output pins. Additionally, the “Receive Section” of the
device will receive data from the LIU via “RxPOS” and
“RxNEG” input pins.
Setting this bit-field to “1” configures the XRT72L13 to
operate in the “Single-Rail” Mode. In this mode, the
“Transmit Section” of the XRT72L13 M13 device will
output data to the LIU, in a binary data stream man-
ner via the “TxPOS” output pin. Additionally, the “Re-
ceive Section” of the device will receive data from the
LIU, in a binary data stream manner, via the RxPOS
input pin.
Bit 2 - TxClkInv
This “Read/Write” bit-field permits the user to config-
ure the XRT72L13 M13 device to output data, via the
“TxPOS” and “TxNEG” output pins, upon the “rising”
or “falling” edge of “TxLineClk”.
Setting this bit-field to “0” configures the XRT72L13
M13 device to output data via the “TxPOS” and “Tx-
NEG” output pins, on the “rising” edge of “TxLineClk”.
Setting this bit-field to “1” configures the XRT72L13
M13 device to output data via the “TxPOS” and “Tx-
NEG” output pins, on the “falling” edge of “TxLineClk”.
Bit 1 - RxClkInv
This “Read/Write” bit-field permits the user to config-
ure the XRT72L13 M13 device to latch data on the
“RxPOS” and “RxNEG” input pins input pins, into the
XRT72L13 M13 device, on the “rising” or “falling”
edge of “RxLineClk”.
Setting this bit-field to “0” configures the XRT72L13
M13 device to latch the data on the “RxPOS” and
“RxNEG” input pins, into the device, on the “rising”
edge of “RxLineClk”.
Setting this bit-field to “1” configures the XRT72L13
M13 device to latch the data on the “RxPOS” and
“RxNEG” input pins, into the device, on the “falling”
edge of “RxLineClk”.
Bit 0 - Reframe
This “Read/Write” bit-field permits the user to config-
ure the “Receive Section” of the XRT72L13 M13 de-
vice to start a new frame search. A “0” to “1” transi-
tion in this bit-field will force the chip to start a new
frame search.
2.3.2.4 Part Number Register
PART NUMBER REGISTER (ADDRESS = 0X02)
BIT 7
RO
0
BIT 6
RO
0
BIT 5
RO
1
BIT 4
BIT 3
Part Number Value
RO
RO
0
0
BIT 2
RO
0
BIT 1
RO
1
BIT 0
RO
0
The Part Number Register (within the XRT72L13 M13
device) contains the fixed value of “0x22”. This part
number value permits the user to read out the con-
tents of this register and to uniquely identify this de-
vice as the “XRT72L13 M13” device.
2.3.2.5 Version Number Register
The “Version Number” register (within the XRT72L13
M13 device) contains a value which corresponds to
the “Revision Number”. The very first Revision of the
XRT72L13 (Revision A) will contain the fixed value
“0x01”. The contents of the “Version Number” regis-
ter will be incremented for subsequent version (if
needed).
VERSION NUMBER REGISTER (ADDRESS = 0X03)
BIT 7
RO
0
BIT 6
RO
0
BIT 5
RO
0
BIT 4
BIT 3
Version Number Value
RO
RO
0
0
BIT 2
RO
0
BIT 1
RO
0
BIT 0
RO
1
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