XRT79L71IB datasheet(97/434 Pages) EXAR

97 / 434 page

XRT79L71

REV. 1.0.0

1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION

RECEIVE E3, ITU-T G.751 RELATED REGISTERS

BIT NUMBER

NAME

TYPE

DESCRIPTION

DS3 AIS - Unframed "All-

Ones"

R/W

DS3 AIS - Unframed "All-Ones" - AIS Pattern:

This READ/WRITE bit-field, (along with the Non-Stuck-Stuff bit)

permits the user specify the AIS Declaration criteria for the

Receive DS3 Framer block, as described below.

0 - Configures the Receive DS3 Framer block to declare the AIS

defect condition, when receiving a DS3 signal carrying a framed

1010.. pattern.

1 - Configures the Receive DS3 Framer block to declare an AIS

condition, when receiving either an unframed, "All-Ones" pattern

or a framed 1010.. pattern.

DS3 AIS -Non-Stuck Stuff

R/W

DS3 AIS -Non-Stuck-Stuff Option - AIS Pattern:

This READ/WRITE bit-field (along with the Unframed "All-Ones"

- AIS Pattern bit-field) permits the user to define the AIS Defect

Declaration criteria for the Receive DS3 Framer block, as

described below.

0 - Configures the Receive DS3 Framer block to require that all

C bits are set to "0" before it will declare the AIS defect condition.

1 - Configures the Receive DS3 Framer block to NOT require

that all C bits are set to "0" before it will declare the AIS defect

condition. In this mode, no attention will be paid to the state of

the "C" bits within the incoming DS3 data-stream.

Unused

R/O

Receive LOS Pattern

R/W

Receive LOS Pattern:

This READ/WRITE bit-field permits the user to define the LOS

Defect Declaration criteria for the Receive DS3 Framer block, as

described below.

0 - Configures the Receive DS3 Framer block to declare the

LOS defect condition if it receives a string of a specific length of

consecutive zeros.

1 - Configures the Receive DS3 Framer block to declare the

LOS defect condition if it receives a string (of a specific length) of

consecutive ones.

NOTE: This bit-field is only enabled if the "Internal LOS Enable"

feature has been enabled within the Receive DS3/E3

Framer block.

3 - 0

Receive DS3 Idle

Pattern[3:0]

R/W

Receive DS3 Idle Pattern:

These READ/WRITE bit-fields permit the user to specify the pat-

tern in which the Receive DS3 Framer block will recognize as

the DS3 Idle Pattern.

NOTE: The Bellcore GR-499-CORE specified value for the Idle

Pattern is a framed repeating "1, 1, 0, 0…" pattern.

Therefore, if the user wishes to configure the Receive

DS3 Framer block to declare an Idle Pattern when it

receives this pattern, then the user write the value [1100]

into these bit-fields.

XRT79L71IB Datasheet(PDF) 97 Page - Exar Corporation

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