XRT86VL30 datasheet(31/188 Pages) EXAR

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XRT86VL30

REV. 1.0.0

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

TABLE 8: FRAMING CONTROL REGISTER (FCR)

HEX ADDRESS: 0X010B

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

Reframe

R/W

Force Reframe

A ‘0’ to ‘1’ transition will force the Receive E1 Framer to restart the syn-

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

after frame synchronization is reached.

6-5

Loss of CAS MF

Align_Sel [1:0]

R/W

Loss of CAS Multiframe Alignment Defect Declaration Criteria

Select [1:0]

These two bits permit the user to select the “Loss of CAS Multiframe

Alignment” defect declaration criteria. Loss of CAS Multiframe Align-

ment defect is declared based on the number of consecutive CAS mul-

tiframes with Multiframe Alignment signal received in error as indicated

in the table below.

NOTE:

These bits are active only if CAS Multiframe Alignment is

enabled.

4-3

Loss of CRC Multi-

frame Align_Sel[1:0]

R/W

Loss of CRC-4 Multiframe Alignment Defect Declaration Criteria

Select [1:0]

These two bits permit the user to select the “Loss of CRC-4 Multiframe

Alignment” defect declaration criteria for the Channel. The following

table presents the different CRC-4 Multiframe Algorithms in terms of

the number of consecutive erred CRC-4 multiframe alignments that the

E1 Receiver Framer will receive before it declares the “Loss of CRC-4

Multiframe Alignment” defect condition.

NOTE:

These bits are only active if CRC Multiframe Alignment is

enabled. If CRC multiframe alignment is not found in 8ms, the

E1 receive framer will restart the synchronization process.

NOTE: TBR-4 standard is enabled by writing to 0x0112, bit 6.

CASC[1:0]

LOSS OF CAS MULTIFRAME ALIGNMENT

DECLARATION CRITERIA

2 consecutive CAS Multiframes

3 consecutive CAS Multiframes

4 consecutive CAS Multiframes

8 consecutive CAS Multiframes

CRCC[1:0]

LOSS OF CRC-4 MULTIFRAME ALIGNMENT

DECLARATION CRITERIA

4 consecutive CRC-4 Multiframes Alignment

2 consecutive CRC-4 Multiframes Alignment

8 consecutive CRC-4 Multiframes Alignment

If TBR-4 Standard is Enabled*:

4 consecutive CRC-4 Multiframe Alignment or 915

or more CRC-4 errors

If TBR-4 Standard is Disabled*:

915 or more CRC-4 errors

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