XRT79L71_1 Datasheet, PDF (135/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

REV. 1.0.0
XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
BIT NUMBER
5
TxIdle
NAME
4
TxAIS
3
TxLOS
TYPE
R/W
R/W
R/W
DESCRIPTION
Transmit DS3 Idle Signal:
This READ/WRITE bit-field permits the user to force the Trans-
mit DS3 Framer block to transmit the DS3 Idle signal pattern to
the remote terminal equipment, as described below.
0 - Configures the Transmit DS3/E3 Framer block to transmit
normal traffic to the remote terminal equipment.
1 - Configures the Transmit DS3/E3 Framer block to transmit the
DS3 Idle Pattern to the remote terminal equipment
NOTES:
1. This bit-field is ignored if TxAIS or TxLOS bit-fields are
set to "1".
2. The exact pattern that the Transmit DS3 Framer block
transmits (whenever this bit-field is set to "1") depends
upon the contents within Bits 3 through 0
(Tx_Idle_Pattern[3:0]) within the Transmit DS3 Pattern
Register (Address = 0x114C).
Transmit AIS Pattern:
This READ/WRITE bit-field permits the user to force the Trans-
mit DS3 Framer block to transmit the AIS indicator to the remote
terminal equipment, as described below.
0 - Configures the Transmit DS3/E3 Framer block to transmit
normal traffic to remote terminal equipment.
1 - Configures the Transmit DS3/E3 Framer block to transmit the
DS3 AIS indicator to the remote terminal equipment.
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 (Address = 0x114C).
Transmit LOS Pattern:
This READ/WRITE bit-field permits the user to force the Trans-
mit DS3 Framer block to transmit an LOS signal pattern to the
remote terminal equipment, as described below.
0 - Configures the Transmit DS3/E3 Framer block to transmit
normal traffic to the remote terminal equipment.
1 - Configures the Transmit DS3/E3 Framer block to transmit the
LOS Pattern (e.g., All Zeros or an All Ones Pattern, depending
upon user configuration).
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 (Address =0x114C).
126