XRT86VL30 datasheet(21/188 Pages) EXAR

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XRT86VL30

REV. 1.0.0

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

3-2

CRC MF Align

Sel[1:0]

R/W

CRC Multiframe Alignment Declaration Criteria Select [1:0]

These two bits allow the user to select which CRC-Multiframe Alignment

Declaration criteria the Receive E1 Framer block will employ. The Receive

E1 Framer block will check for CRC Multiframe Alignment by checking the

incoming E1 data-stream and determining whether the international bits (bit

1 of timeslot 0) of non-FAS frames match the CRC multiframe alignment

pattern (0,0,1,0,1,1,E1,E2). The table below provides more details on the

three different CRC Multiframe Alignment Declaration Criteria.

NOTE: For information on the criteria that the Receive E1 Framer block

uses to declare the “Loss of CRC Multiframe Alignment” defect

condition, please see register description for the Framing Control

Additional Frame

Check Enable -

FAS

R/W

Additional Frame Check Enable - FAS Frame Alignment Declaration

This bit permits the user to configure the Receive E1 Framer block to per-

form some “additional FAS frame synchronization checking” prior to declar-

ing “FAS Frame Alignment”. If the user implements this feature, then the

Receive E1 Framer block will perform some more testing on two additional

E1 frames, prior to declaring the “FAS Frame Alignment” condition.

0 - Disables this additional FAS frame checking.

1 - Enables this additional FAS frame checking.

TABLE 4: FRAMING SELECT REGISTER (FSR)

HEX ADDRESS: 0X0107

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

CRC MF

ALIGN SEL

[1:0]

CRC MULTIFRAME ALIGNMENT DECLARATION CRITERIA

SELECTED

CRC Multiframe Alignment is Disabled

CRC Multiframe Alignment is Enabled. Alignment is

declared if at least 1 valid CRC multiframe alignment

signal (0,0,1,0,1,1,E1,E2) is observed within 8ms.

CRC Multiframe Alignment is Enabled. Alignment is

declared if at least 2 valid CRC multiframe alignment

signals (0,0,1,0,1,1,E1,E2) are observed within 8ms.

CRC Multiframe Alignment is Enabled. Alignment is

declared if at least 3 valid CRC multiframe alignment

signals (0,0,1,0,1,1,E1,E2) are observed within 8ms.

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