XRT72L13 datasheet(97/370 Pages) EXAR

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M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13

PRELIMINARY

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

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).

PART NUMBER REGISTER (ADDRESS = 0X02)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

Part Number Value

00100010

VERSION NUMBER REGISTER (ADDRESS = 0X03)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

Version Number Value

00000001

XRT72L13 Datasheet(PDF) 97 Page - Exar Corporation

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