
XRT86L30
SINGLE T1/E1/J1 FRAMER/LIU COMBO
REV. P1.0.1
PRELIMINARY
79
T
ABLE
70: T
RANSMIT
D
ATA
L
INK
B
YTE
C
OUNT
R
EGISTER
R
EGISTER
53 T
RANSMIT
D
ATA
L
INK
B
YTE
C
OUNT
R
EGISTER
2 (TDLBCR2) H
EX
A
DDRESS
: 0
X
0144
B
IT
F
UNCTION
T
YPE
D
EFAULT
D
ESCRIPTION
-O
PERATION
7
BUFAVAL//BUFSEL
R/W
0
Transmit HDLC2 Buffer Available/Buffer Select
Specifies which of the two Tx HDLC2 Buffers that the Tx HDLC2 controller
should read from to generate the next outbound HDLC2 message.
0 = transmits message data residing in Tx HDLC2 Buffer 0.
1 = transmits message data residing in Tx HDLC2 buffer 1.
N
OTE
:
If one of these Tx HDLC2 buffers contain a message which has yet
to be completely read-in and processed for transmission by the Tx HDLC2
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 per-
mitted.
6
TDLBC6
R/W
0
Transmit HDLC2 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 HDLC2
controller generates the TxEOT interrupt and halts transmission. If these
fields are set to 00000000, then the BOS message 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.
5
TDLBC5
R/W
0
4
TDLBC4
R/W
0
3
TDLBC3
R/W
0
2
TDLBC2
R/W
0
1
TDLBC1
R/W
0
0
TDLBC0
R/W
0
T
ABLE
71: R
ECEIVE
D
ATA
L
INK
B
YTE
C
OUNT
R
EGISTER
R
EGISTER
54 R
ECEIVE
D
ATA
L
INK
B
YTE
C
OUNT
R
EGISTER
2 (RDLBCR2) H
EX
A
DDRESS
: 0
X
0145
B
IT
F
UNCTION
T
YPE
D
EFAULT
D
ESCRIPTION
-O
PERATION
7
RBUFPTR
R/W
0
Receive HDLC2 Buffer-Pointer
Identifies which RxHDLC2 buffer contains the newly received HDLC2 mes-
sage.
0 = HDLC2 message is stored in Rx HDLC2 Buffer 0.
1 = HDLC2 message is stored in Rx HDLC2 Buffer 1.
6
RDLBC6
R/W
0
Re
ceive HDLC Message - byte count
In MOS Mode
These seven bit-fields contain the size in bytes of the HDLC2 message 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 interrupt will be generated.
5
RDLBC5
R/W
0
4
RDLBC4
R/W
0
3
RDLBC3
R/W
0
2
RDLBC2
R/W
0
1
RDLBC1
R/W
0
0
RDLBC0
R/W
0