XRT7250 datasheet(104/463 Pages) EXAR

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DS3/E3 FRAMER IC

XRT7250

REV. 1.1.1

Writing a "1" to this bit-field invokes this command.

Writing a "0" allows the Transmit DS3 Framer to func-

tion normally (e.g., the Transmit DS3 Framer will

transmit its payload and internally generated over-

head bits).

NOTE: For more information on this feature, please see

Section 3.2.4.2.1.3.

NOTE: This bit-setting is ignored if Bits 3 or 4 (within this

Bit 4 - Tx AIS (Pattern)

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

mand the Transmit DS3 Framer to transmit an AIS

pattern. If the user invokes this command, then the

Transmit DS3 Framer will force the outbound DS3

frames to have the following patterns.

• Valid M-bits, F-bits, and P-bits

• All C-bits are set to '0'

• All X-bits are set to '1'

• A repeating '1010...' pattern is written into the pay-

load of the DS3 Frames.

Writing a "1' to this bit-field invokes this command.

Writing a "0" allows the Transmit DS3 Framer to func-

tion normally (e.g., the Transmit DS3 Framer will

transmit its payload and internally generated over-

head bits).

NOTE: For more information on this feature, please see

Section 3.2.4.2.1.4.

Bit 3 - Tx LOS (Loss of Signal)

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

mand the Transmit DS3 Framer to simulate an LOS

Condition. If the user invokes this command, then the

Transmit DS3 Framer will stop sending mark pulses

out on the line and will transmit an all-zero pattern.

Writing a '0' to this bit-field disables (or shuts off) this

feature, thereby allowing internally generated DS3

Frames to be generated and transmitted over the line.

Writing a '1' to this bit-field invokes this command,

causing the Transmit DS3 Framing to generate an all

'0' pattern.

NOTE: For more information on this feature, please see

Section 3.2.4.2.1.5.

Bit 2 - FERF on LOS

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

the Transmit DS3 Framer to generate a Yellow Alarm

if the Near-End Receive DS3 Framer detects a LOS

(Loss of Signal) Condition.

Writing a "1" to this bit-field enables this feature. Writ-

ing a "0" to this bit-field disables this feature.

NOTE: For more information on this feature, please see

Section 3.2.4.2.1.6.

Bit 1 - FERF on OOF

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

the Transmit DS3 Framer to generate a Yellow Alarm

if the Near-End Receive DS3 Framer detects an OOF

(Out-of-Frame) Condition.

Writing a "1" to this bit-field enables this feature. Writ-

ing a "0" to this bit-field disables this feature.

NOTE: For more information on this feature, please see

Section 3.2.4.2.1.7.

Bit 0 - FERF on AIS

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

the Transmit DS3 Framer to generate a Yellow Alarm

if the Near-End Receive DS3 Framer detects an AIS

(Alarm Indication Signal) Condition.

Writing a "1" to this bit-field enables this feature. Writ-

ing a "0" to this bit-field disables this feature.

NOTE: For more information on this feature, please see

Section 3.2.4.2.1.8.

2.3.5.2

Transmit DS3 FEAC Configuration &

Status Register (DS3 Applications)

Bit 4 - Tx FEAC Interrupt Enable

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

disable the Transmit FEAC Interrupt.

Setting this bit-field to “0” disables this interrupt.

Conversely, setting this bit-field to “1” enables this in-

terrupt.

Bit 3 - TxFEAC Interrupt Status

TRANSMIT DS3 FEAC CONFIGURATION & STATUS REGISTER (ADDRESS = 0X31)

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

Not Used

Tx FEAC

Interrupt

Enable

TxFEAC

Interrupt

Status

TxFEAC

Enable

TxFEAC

Busy

R/W

RUR

R/W

0000

000

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