XRT72L13 datasheet(203/370 Pages) EXAR

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XRT72L13

M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

PRELIMINARY

REV. P1.0.6

191

These two “Read/Write” bit-fields permits the user to

select both a “Framing Reference” and a “Timing Ref-

erence” for the Transmit Section of the

XRT72L1372L13. The following table relates the

states of the two-fields to the selected “Framing” and

“Timing” references.

NOTE: For more information on Framing and Timing Refer-

ences, please see Section _.

3.3.2.2

I/O Control Register

Bit 7 - Disable TxLOC

Bit 6 - LOC (Loss of Clock) Indicator

Bit 5 - Disable RxLOC

Bit 4 - AMI/B3ZS* Line Code Select

This “Read/Write” bit-field pemits the user to config-

ure the XRT72L13 M13 device to transmit and re-

ceive data via the AMI (Alternate Mark Inversion) line

code or via the B3ZS (Bipolar 3 Zero Substitution)

line code.

Setting this bit-field to “0” configures the XRT72L13

M13 device to transmit and receive data (via the DS3

Framer block) via the B3ZS format. Setting this bit-

field to “1” configures the XRT72L13 M13 device to

transmit and receive data via the AMI line code.

Bit 3 - Single-Rail/Dual-Rail Select

This “Read/Write” bit-field permits the user to config-

ure the XRT72L13 M13 device to operate in the “Sin-

gle-Rail” or “Dual-Rail” format.

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

TIMREFSEL[1:0]

FRAMING REFERENCE

TIMING REFERENCE

Asynchronous

RxLineClk Input signal

TxFrameRef

RxLineClk Input signal

Asynchronous

TxInClk Input

signal

Asynchronous

TxInClk Input

signal

I/O CONTROL REGISTER (ADDRESS = 0X01)

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

Disable

TxLOC

LOC

Disable

RxLOC

AMI/B3ZS*

Line Code

Single-Rail/

Dual-Rail*

TxClkInv

RxClkInv

Reframe]

R/W

0100

000

XRT72L13 Datasheet(PDF) 203 Page - Exar Corporation

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