XRT86VL30 datasheet(38/188 Pages) EXAR

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XRT86VL30

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

REV. 1.0.0

TABLE 15: RECEIVE EXTRA BITS REGISTER (REBR)

HEX ADDRESS: 0X0112

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

In-Frame

In Frame State:

This READ-ONLY bit indicates whether the Receive E1 Framer block is

currently declaring the “In-Frame” condition with the incoming E1 data-

stream.

0 - Indicates that the Receive E1 Framer block is currently declaring the

LOF (Loss of Frame) Defect condition.

1 - Indicates that the Receive E1 Framer block is currently declaring itself

to be in the “In-Frame” condition.

TBR4_Std

R/W

TBR4 Standard

Setting this bit will force the XRT86VL30 to be compliant with the TBR-4

standard for “Loss of CRC-4 Multiframe Alignment Criteria”.

0 - Backward compatible with XRT86L38 for Loss of CRC-4 Multiframe

Criteria. When CRCC[1:0] (from register 0x010B) is set to’11’, Loss of

CRC-4 Multiframe Alignment will declare if 915 or more CRC-4 errors

have been detected in 1 second.

1 - “TBR-4 Compliant” Loss of CRC-4 Multiframe Alignment Criteria -

When CRCC[1:0] (from register 0x010B) is set to’11’, Loss of CRC-4 Mul-

tiframe Alignment will declare if 4 consecutive CRC-4 Multiframe Align-

ment have been received in error OR if 915 or more CRC-4 errors have

been detected in 1 second.

5-4

Reserved

EX1

Extra Bit 1

This READ ONLY bit field indicates the value of the most recently

received Extra Bit value (bit 5 within timeslot 16 of frame 0 of the signal-

ing multiframe).

NOTE:

This bit only has meaning if the framer is using Channel

Associated Signaling.

ALARMFE

CAS Multi-Frame Yellow Alarm

This READ ONLY bit field indicates the value of the most recently

received CAS Multiframe Yellow Alarm Bit (bit 6 within timeslot 16 of

frame 0 of the signaling multiframe).

0 = Indicates that the E1 receive framer block is NOT receiving the CAS

Multiframe Yellow Alarm.

1 = Indicates that the E1 receive framer block is currently receiving the

CAS Multiframe Yellow Alarm.

NOTE:

This bit only has meaning if the framer is using Channel

Associated Signaling.

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