XRT86L30
REV. 1.0.1
SINGLE T1/E1/J1 FRAMER/LIU COMBO
TABLE 70: TRANSMIT
D
ATA
L
INK
B
YTE
COUNT REGISTER
R
EGISTER 53
IT
T
RANSMIT
D
ATA
L
INK
B
YTE OUNT
C
R
EGISTER 2 (TDLBCR2)
HEX ADDRESS: 0X0144
B
F
TDLBC6
TDLBC5
TDLBC4
TDLBC3
TDLBC2
TDLBC1
TDLBC0
UNCTION
TYPE
D
EFAULT
DESCRIPTION-OPERATION
6
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
Transmit HDLC2 Message - Byte Count
Depends on whether an MOS or BOS message is being transmitted
to the Remote Terminal Equipment
5
4
3
2
1
0
If BOS message is being transmitted: These bit fields contain the
number of repetitions the BOS message must be transmitted before
the Tx HDLC2 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.
TABLE 71: RECEIVE
D
ATA
L
INK
B
YTE
COUNT REGISTER
R
EGISTER 54
IT
R
ECEIVE
D
ATA
L
INK
B
YTE OUNT
C
R
EGISTER 2 (RDLBCR2)
HEX ADDRESS: 0X0145
B
F
UNCTION
TYPE
D
EFAULT
DESCRIPTION-OPERATION
7
RBUFPTR
R/W
0
Receive HDLC2 Buffer-Pointer
Identifies which RxHDLC2 buffer contains the newly received
HDLC2 message.
0 = HDLC2 message is stored in Rx HDLC2 Buffer 0.
1 = HDLC2 message is stored in Rx HDLC2 Buffer 1.
6
5
4
3
2
1
0
RDLBC6
RDLBC5
RDLBC4
RDLBC3
RDLBC2
RDLBC1
RDLBC0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
Receive HDLC Message - byte count
In MOS Mode
These seven bit-fields contain the size in bytes of the HDLC2 mes-
sage that has been extracted and written into the Rx HDLC2 buffer.
In BOS Mode
These bits should be set to the value of the message repetitions
before each receive interrupt. If they are set to “0”, no RxEOT inter-
rupt will be generated.
78
EXAR [ EXAR CORPORATION ]
