XRT86VL34 datasheet(30/156 Pages) EXAR

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XRT86VL34

QUAD T1/E1/J1 FRAMER/LIU COMBO - T1 REGISTER DESCRIPTION

REV. V1.2.0

TABLE 10: FRAMING CONTROL REGISTER (FCR)

HEX ADDRESS: 0Xn10B

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

Reframe

R/W

Force Reframe

A ‘0’ to ‘1’ transition will force the Receive T1 Framer to restart the syn-

chronization process. This bit field is automatically cleared (set to 0)

after frame synchronization is reached.

Framing with CRC

Checking

R/W

Framing with CRC Checking in ESF

This bit permits the user to include CRC verification as a part of the

“T1/ESF Framing Alignment” process. If the user enables this feature,

then the Receive T1 Framer block will also check and verify that the

incoming T1 data-stream contains correct CRC data, prior to declaring

the “In-Frame” condition.

0 - CRC Verification is NOT included in the “Framing Alignment” pro-

cess.

1 - Receive T1 Framer block will also check for correct CRC values

prior to declaring the “In-Frame” condition.

5-3

LOF Tolerance[2:0]

R/W

000

LOF Defect Declaration Tolerance[2:0]:

These bits along with the LOF_RANGE[2:0] bits are used to define the

LOF Defect Declaration criteria. The Receive T1 Framer block will

declare the LOF defect condition anytime it detects

“LOF_Tolerance[2:0]” out of “LOF_Range[2:0] framing bit errors within

the incoming T1 data-stream.

The recommended LOF_TOLR value is 2.

NOTE: A “0” value for LOF_TOLR is internally blocked. A LOF_TOLR

value must be specified.

2-0

LOF_Range[2:0]

R/W

011

LOF Defect Declaration Range[2:0]:

These bits along with the “LOF_Tolerance[2:0] bits are used to define

the “LOF Defect Declaration” criteria. The Receive T1 Framer block will

declare the LOF Defect condition anytime it has received

“LOF_Tolerance[2:0] out of “LOF_Range[2:0] framing bit errors, within

the incoming T1 data-stream.

The recommended LOF_ANG value is 5.

NOTE: A “0” value for LOF_RANG is internally blocked. A LOF_RANG

value must be specified.

XRT86VL34 Datasheet(PDF) 30 Page - Exar Corporation

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