XRT86L30
REV. 1.0.1
SINGLE T1/E1/J1 FRAMER/LIU COMBO
TABLE 72: DATA
L
INK
CONTROL REGISTER
R
EGISTER 55
IT
D
ATA
L
INK
C
ONTROL EGISTER 3 (DLCR3)
R
HEX ADDRESS: 0X0153
B
F
UNCTION
T
YPE
D
EFAULT
DESCRIPTION-OPERATION
1
Tx_FCS_EN
R/W
0
Transmit LAPD Message with FCS
Configure HDLC3 Controller to include/not include FCS octets in the
outbound LAPD message frames.
0 = Does not include FCS octets into the outbound LAPD message
frame.
1 = Inserts FCS octets into the outbound LAPD message frame.
NOTE: This bit-field is ignored if the transmit HDLC3 controller has
been configured to operate in the BOS mode.
0
MOS/BOS
R/W
0
Message Oriented Signaling/Bit Oriented Signaling Select
Specifies whether the TxRx HDLC3 Controller will be transmitting
and receiving LAPD message frames (MOS) or Bit Oriented Signal
(BOS) messages.
0 = Tx/Rx HDLC3 Controller transmits and receives BOS messages.
1 = Tx/Rx HDLC3 Controller transmits and receives MOS mes-
sages.
TABLE 73: TRANSMIT
D
ATA
L
INK
B
YTE
COUNT REGISTER
R
EGISTER 56
IT
T
RANSMIT
D
ATA
L
INK
B
YTE OUNT
C
R
EGISTER 3 (TDLBCR3)
HEX ADDRESS: 0X0154
B
F
UNCTION
TYPE
D
EFAULT
DESCRIPTION-OPERATION
7
BUFAVAL//BUFSEL
R/W
0
Transmit HDLC3 Buffer Available/Buffer Select
Specifies which of the two Tx HDLC3 Buffers that the Tx HDLC3
controller should read from to generate the next outbound HDLC3
message.
0 = transmits message data residing in Tx HDLC3 Buffer 0.
1 = transmits message data residing in Tx HDLC3 buffer 1.
N
OTE: If one of these Tx HDLC3 buffers contain a message which
has yet to be completely read-in and processed for
transmission by the Tx HDLC3 controller, then this bit-field
will automatically reflect the value corresponding to the
available buffer. Changing this bit-field to the in-use buffer is
not permitted.
6
5
4
3
2
1
0
TDLBC6
TDLBC5
TDLBC4
TDLBC3
TDLBC2
TDLBC1
TDLBC0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
Transmit HDLC3 Message - Byte Count
Depends on whether an MOS or BOS message is being transmitted
to the Remote Terminal Equipment
If BOS message is being transmitted: These bit fields contain the
number of repetitions the BOS message must be transmitted before
the Tx HDLC3 controller generates the TxEOT interrupt and halts
transmission. If these fields are set to 00000000, then the BOS mes-
sage will be transmitted for an indefinite number of times.
If MOS message is being transmitted: These bit fields contain the
length, in number of octets, of the message to be transmitted.
80
EXAR [ EXAR CORPORATION ]
