
XRT84L38
403
REV. 1.0.1
OCTAL T1/E1/J1 FRAMER
The table below shows configurations of the ABORT bit of the Data Link Control Register (DLCR).
DATA LINK CONTROL REGISTER (DLCR) (INDIRECT ADDRESS = 0XN0H, 0X13H)
Switching the data link channel from MOS mode to BOS mode while a message is being transmitted will
interrupt the message after the octet in progress is transmitted. If the MOS ABORT bit of the Data Link Control
Register is set, a MOS ABORT sequence (a zero followed by 7 ones) will be inserted before switching.
Switching the data link from BOS to LAPD will not take place until the current operation completes if Transmit
BOS byte count is not set to zero initially. If the Transmit BOS byte count value is set to zero, the transition
from BOS mode to MOS mode will take place right after finishing the current message octet.
The table below shows configurations of the MOS ABORT bit of the Data Link Control Register (DLCR).
DATA LINK CONTROL REGISTER (DLCR) (INDIRECT ADDRESS = 0XN0H, 0X13H)
13.1.4.2.5
Step 5: Enable transmit MOS message interrupts
The LAPD Controller can generate a couple of interrupts indicating the status of MOS message transmission to
the microprocessor. These are the Transmit Start of Transfer (TxSOT) interrupt and the Transmit End of
Transfer (TxEOT) interrupt.
To enable these interrupts, the Transmit Start of Transfer Enable bit and the Transmit End of Transfer Enable
bit of the Data Link Interrupt Enable Register (DLIER) have to be set. In addition, the HDLC Controller Interrupt
Enable bit of the Block Interrupt Enable Register (BIER) needs to be one.
The table below shows configurations of the Transmit Start of Transfer Enable bit and the Transmit End of
Transfer Enable bit of the Data Link Interrupt Enable Register.
DATA LINK INTERRUPT ENABLE REGISTER (DLIER) (INDIRECT ADDRESS = 0XNAH, 0X07H)
B
IT
N
UMBER
B
IT
N
AME
B
IT
T
YPE
B
IT
D
ESCRIPTION
3
ABORT
R/W
0 - No ABORT sequence is sent on the data link channel.
1 - The framer forces an ABORT sequence of pattern (111111 10) onto the
data link channel. IDLE flag pattern will be transmitted after the ABORT
sequence is sent.
B
IT
N
UMBER
B
IT
N
AME
B
IT
T
YPE
B
IT
D
ESCRIPTION
6
MOS ABORT
R/W
0 - The framer forces an MOS ABORT sequence of one zero and seven
ones [0111 1111] onto the data link channel during the transition from MOS
mode to BOS mode.
1 - No MOS ABORT sequence is sent on the data link channel during the
transition from MOS mode to BOS mode.
B
IT
N
UMBER
B
IT
N
AME
B
IT
T
YPE
B
IT
D
ESCRIPTION
6
Transmit Start of
Transfer Enable
R/W
0 - The Transmit Start of Transfer interrupt is disabled.
1 - The Transmit Start of Transfer interrupt is enabled.
4
Transmit End of
Transfer Enable
R/W
0 - The Transmit End of Transfer interrupt is disabled.
1 - The Transmit End of Transfer interrupt is enabled.