XRT7250 datasheet(76/463 Pages) EXAR

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DS3/E3 FRAMER IC

XRT7250

REV. 1.1.1

2.3.2.2

I/O Control Register

Bit 7 - DisableTxLOC

This Read/Write bit-field permits the user to enable or

disable the Transmit Loss of Clock feature.

Setting this bit-field to "0" enables the Transmit Loss

of Clock feature. Conversely, setting this bit-field to

"1" disables the Transmit Loss of Clock feature.

NOTE: For more details into the Transmit Loss of Clock fea-

ture, please see Section 1.4.

Bit 6 - LOC (Loss of Clock) Status

This Read-Only bit-field reflects the Loss of Clock

status for the XRT7250. The XRT7250 will set this

bit-field to "0" under normal operation conditions.

Conversely, if the XRT7250 has experiences a Loss

of Clock event, then it will set this bit-field to "1".

NOTE: For more details into the Loss of Clock status,

please see Section 1.4.

Bit 5 - DisableRxLOC

This Read/Write bit-field permits the user to enable or

disable the Receive Loss of Clock feature.

Setting this bit-field to "0" enables the Receive Loss

of Clock feature. Conversely, setting this bit-field to

"1" disables the Receive Loss of Clock feature.

NOTE: For more details into the Receive Loss of Clock fea-

ture, please see Section 1.4.

Bit 4 - AMI/ZeroSup*

This Read/Write bit-field permits the user to configure

the XRT7250 to transmit and receive data via the AMI

(Alternate Mark Inversion) line code or via a Zero-

Suppression (e.g, B3ZS/HDB3) line code.

Setting this bit-field to "0" configures the XRT7250 to

transmit and receive data via a Zero-Suppression line

code.

Setting this bit-field to "1" configures the XRT7250 to

transmit and receive data via the Alternate Mark In-

version line code.

NOTES:

1. If the XRT7250 is configured to transmit and

receive data, using a Zero-Suppression code, while

operating in the DS3 Mode, then the chip will trans-

mit and receive data using the B3ZS Line Code.

2. If the XRT7250 is configured to transmit and

receive data, using a Zero-Suppression code, while

operating in the E3 Mode, then the chip will trans-

mit and receive data using the HDB3 Line Code.

3. This bit-field will be ignored if bit 3 (Unipolar/Bipo-

lar*) of this Register is set to "1" (for Unipolar

Mode).

Bit 3 - Unipolar/Bipolar*

This Read/Write bit-field permits the user to configure

the XRT7250 to transmit data to and receive data

from an LIU IC, in either the Single-Rail or Dual-Rail

format.

Setting this bit-field to "0" configures the XRT7250 to

operate in the Bipolar or Dual-Rail Format. In this

mode, the Transmit Section of the XRT7250 will out-

put data to the LIU via both the TxPOS and TxNEG

output pins. Additionally, the Receive Section of the

device will receive data from the LIU via both the Rx-

POS and RxNEG output pins.

Setting this bit-field to "1" configures the XRT7250 to

operate in the Unipolar or Single-Rail Format. In this

mode, the Transmit Section of the XRT7250 will out-

put data to the LIU, in a binary data stream manner

via the TxPOS output pin. Additionally, the Receive

Section of the device will receive data from the LIU, in

a binary data stream manner, via the RxPOS input

pin.

NOTE: For more information on the transmission and

reception of data in the Single-Rail or Dual-Rail format,

please see Section 3.2.5.

Bit 2 - TxLineClk Invert

This Read/Write bit-field permits the user to configure

the XRT7250 to output data, via the TxPOS and Tx-

NEG output pins, on the rising or falling edge of TxLi-

neClk.

Setting this bit-field to "0" configures the XRT7250 to

output data, via the TxPOS and TxNEG output pins,

on the rising edge of TxLineClk.

I/O CONTROL REGISTER (ADDRESS = 0X01)

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

Disable

TxLOC

LOC

Disable

RxLOC

AMI/

ZeroSup*

Unipolar/

Bipolar*

TxLine

Clk

Invert

RxLine

Clk

Invert

Reframe

R/W

0100

000

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