
XRT86L30
SINGLE T1/E1/J1 FRAMER/LIU COMBO
REV. P1.0.1
PRELIMINARY
81
T
ABLE
73: T
RANSMIT
D
ATA
L
INK
B
YTE
C
OUNT
R
EGISTER
R
EGISTER
56 T
RANSMIT
D
ATA
L
INK
B
YTE
C
OUNT
R
EGISTER
3 (TDLBCR3) H
EX
A
DDRESS
: 0
X
0154
B
IT
F
UNCTION
T
YPE
D
EFAULT
D
ESCRIPTION
-O
PERATION
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 per-
mitted.
6
TDLBC6
R/W
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 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
74: R
ECEIVE
D
ATA
L
INK
B
YTE
C
OUNT
R
EGISTER
R
EGISTER
57 R
ECEIVE
D
ATA
L
INK
B
YTE
C
OUNT
R
EGISTER
3 (RDLBCR3) H
EX
A
DDRESS
: 0
X
0155
B
IT
F
UNCTION
T
YPE
D
EFAULT
D
ESCRIPTION
-O
PERATION
7
RBUFPTR
R/W
0
Receive HDLC3 Buffer-Pointer
Identifies which RxHDLC3 buffer contains the newly received HDLC3 mes-
sage.
0 = HDLC3 message is stored in Rx HDLC3 Buffer 0.
1 = HDLC3 message is stored in Rx HDLC3 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 HDLC3 message that
has been extracted and written into the Rx HDLC3 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