XRT86VL30 Datasheet, PDF (74/188 Pages) Exar Corporation – SINGLE T1/E1/J1 FRAMER/LIU COMBO - E1 REGISTER DESCRIPTION

XRT86VL30
SINGLE T1/E1/J1 FRAMER/LIU COMBO - E1 REGISTER DESCRIPTION
REV. 1.0.0
TABLE 55: DATA LINK CONTROL REGISTER (DLCR2)
HEX ADDRESS: 0X0143
BIT
FUNCTION
TYPE DEFAULT
DESCRIPTION-OPERATION
7 Reserved
-
-
Reserved. Please set this bit to’0’ for normal operation.
6 MOS ABORT Disable R/W
0
MOS ABORT Disable:
This bit permits the user to either enable or disable the “Automatic
MOS ABORT” feature within Transmit HDLC Controller # 2. If the
user enables this feature, then Transmit HDLC Controller block # 2
will automatically transmit the ABORT Sequence (e.g., a zero fol-
lowed by a string of 7 consecutive “1s”) whenever it abruptly transi-
tions from transmitting a MOS type of message, to transmitting a
BOS type of message.
If the user disables this feature, then the Transmit HDLC Controller
Block # 2 will NOT transmit the ABORT sequence, whenever it
abruptly transitions from transmitting a MOS-type of message to
transmitting a BOS-type of message.
0 - Enables the “Automatic MOS Abort” feature
1 - Disables the “Automatic MOS Abort” feature
5 Rx_FCS_DIS
R/W
0
Receive Frame Check Sequence (FCS) Verification Enable/Dis-
able
This bit permits the user to configure the Receive HDLC Controller
Block # 2 to compute and verify the FCS value within each incoming
LAPD message frame.
0 - Enables FCS Verification
1 - Disables FCS Verification
4 AutoRx
R/W
0
Auto Receive LAPD Message
This bit configures the Receive HDLC Controller Block #2 to discard
any incoming BOS or LAPD Message frame that exactly match
which is currently stored in the Receive HDLC2 buffer.
0 = Disables this “AUTO DISCARD” feature
1 = Enables this “AUTO DISCARD” feature.
3 Tx_ABORT
R/W
0
Transmit ABORT
This bit configures the Transmit HDLC Controller Block #2 to trans-
mit an ABORT sequence (string of 7 or more consecutive 1’s) to the
Remote terminal.
0 - Configures the Transmit HDLC Controller Block # 2 to function
normally (e.g., not transmit the ABORT sequence).
1 - Configures the Transmit HDLC Controller block # 2 to transmit
the ABORT Sequence.
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