XRT79L71 Datasheet, PDF (187/441 Pages) Exar Corporation – 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

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PRELIMINARY
1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
XRT79L71
REV. P1.0.3
BIT NUMBER
4
TxAIS
NAME
3
TxLOS
2
TxFERF upon LOS
TYPE
R/W
R/W
R/W
DESCRIPTION
Transmit AIS Pattern:
This READ/WRITE bit-field permits the user to force the Frame
Generator block to transmit an AIS signal condition to the remote
terminal equipment.
0 - Normal traffic is generated and transmitted by the Frame
Generator block.
1 - Frame Generator block transmits the DS3 AIS Pattern.
NOTES:
1. This bit-field is ignored if the "TxLOS" bit-field is set to
"1".
2. When this bit-field is set to "1", it will transmit either a
"Framed, repeating 1, 0, 1, 0, …" pattern, or an
"Unframed, All-Ones" pattern, depending upon the
state of Bit 7 (TxAIS Unframed All Ones), within the
"Transmit DS3 Pattern Register (Direct Address =
0x114C).
Transmit LOS Pattern:
This READ/WRITE bit-field permits the user to force the Frame
Generator block to transmit an LOS signal condition to the
remote terminal equipment.
0 - Normal traffic is generated and transmitted by the Frame
Generator block.
1 - Frame Generator block transmits the LOS (e.g., All Zeros)
Pattern.
NOTES:
1. This bit-field is ignored if "TxAIS" or "TxLOS" are set to
"1".
2. When this bit-field is set to "1", it will transmit either an
"All Zeros" pattern, or an "All Ones" pattern; depending
upon the state of Bit 4 (TxLOS Pattern) within the
"Transmit DS3 Pattern Register (Direct Address
=0x114C).
Transmit FERF upon Detection of LOS:
This READ/WRITE bit-field permits the user to configure the
Frame Generator block to automatically transmit the FERF indi-
cator, anytime the Frame Synchronizer block declares an LOS
condition.
0 - Frame Generator block will NOT automatically transmit the
FERF indicator, upon the Frame Synchronizer detecting an LOS
condition.
1 - Frame Generator block will automatically transmit the FERF
indicator upon the Frame Synchronizer detecting an LOS condi-
tion.
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