
XRT86L30
SINGLE T1/E1/J1 FRAMER/LIU COMBO
REV. P1.0.1
PRELIMINARY
59
T
ABLE
33: T
RANSMIT
D
ATA
L
INK
B
YTE
C
OUNT
R
EGISTER
R
EGISTER
20 T
RANSMIT
D
ATA
L
INK
B
YTE
C
OUNT
R
EGISTER
1 (TDLBCR1) H
EX
A
DDRESS
: 0
X
0114
B
IT
F
UNCTION
T
YPE
D
EFAULT
D
ESCRIPTION
-O
PERATION
7
BUFAVAL//BUFSEL
R/W
0
Transmit HDLC1 Buffer Available/Buffer Select
Specifies which of the two Tx HDLC1 Buffers that the Tx HDLC1 controller
should read from to generate the next outbound HDLC1 message.
0 = transmits message data residing in Tx HDLC1 Buffer 0.
1 = transmits message data residing in Tx HDLC1 buffer 1.
N
OTE
:
If one of these Tx HDLC1 buffers contain a message which has yet
to be completely read-in and processed for transmission by the Tx HDLC1
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 HDLC1 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 HDLC1
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
34: R
ECEIVE
D
ATA
L
INK
B
YTE
C
OUNT
R
EGISTER
R
EGISTER
21 R
ECEIVE
D
ATA
L
INK
B
YTE
C
OUNT
R
EGISTER
1 (RDLBCR1) H
EX
A
DDRESS
: 0
X
0115
B
IT
F
UNCTION
T
YPE
D
EFAULT
D
ESCRIPTION
-O
PERATION
7
RBUFPTR
R/W
0
Receive HDLC1 Buffer-Pointer
Identifies which RxHDLC1 buffer contains the newly received HDLC1 mes-
sage.
0 = HDLC1 message is stored in Rx HDLC1 Buffer 0.
1 = HDLC1 message is stored in Rx HDLC1 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 HDLC1 message that
has been extracted and written into the Rx HDLC1 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