
XRT84L38
408
OCTAL T1/E1/J1 FRAMER
REV. 1.0.1
The table below shows the Transmit Start of Transfer and Transmit End of Transfer status bits of the Data Link
Status Register.
DATA LINK STATUS REGISTER (DLSR) (INDIRECT ADDRESS = 0XNAH, 0X06H)
13.1.5.1.4
Step 4: Program the Data Link Control Register to activate SLC96 Data Link Transmission
The SLC96 Enable bit and the LAPD Enable bit of the Data Link Control Register (DLCR) determines which
one of the three functions is performed by the Transmit HDLC Controller block. The table below shows
configuration of the SLC96 Enable bit of the Data Link Control Register (DLCR).
DATA LINK CONTROL REGISTER (DLCR) (INDIRECT ADDRESS = 0XN0H, 0X13H)
The table below shows configuration of the LAPD Enable bit of the Data Link Control Register (DLCR).
DATA LINK CONTROL REGISTER (DLCR) (INDIRECT ADDRESS = 0XN0H, 0X13H)
To enable SLC96 data link transmission, the user has to set both of the SLC96 Enable bit and the LAPD
Enable bit of the Data Link Control Register to 1.
Without inputting new message, the data link controller will loop on the same message over and over again. To
force the data link to output all ones is done by setting the ABORT bit in Data Link Control Register to 1. This
operation takes place after the current message finishes transmitting. The table below shows configurations of
the ABORT bit of the Data Link Control Register (DLCR).
DATA LINK CONTROL REGISTER (DLCR) (INDIRECT ADDRESS = 0XN0H, 0X13H)
Setting the SLCa96 bit low will switch the data link back to transfer normal framing bits after the current
message transmit completes.
B
IT
N
UMBER
B
IT
N
AME
B
IT
T
YPE
B
IT
D
ESCRIPTION
6
Transmit Start of
Transfer
RUR /
WC
0 - There is no data link message to be sent to the data link channel.
1 - The SLC96 Data Link Controller will send SLC96 data link message
to the data link channel.
B
IT
N
UMBER
B
IT
N
AME
B
IT
T
YPE
B
IT
D
ESCRIPTION
7
SLC96 Enable
R/W
0 - In SLC96 framing mode, the data link transmission is disabled. The
framer transmits the regular SF framing bits.
In ESF framing mode, the framer transmits regular ESF framing bits and
Facility Data Link (FDL) bits.
1 - In SLC96 framing mode, the data link transmission is enabled.
In ESF framing mode, the framer transmits SLC96-like message in the
Facility Data Link bits.
B
IT
N
UMBER
B
IT
N
AME
B
IT
T
YPE
B
IT
D
ESCRIPTION
0
LAPD Enable
R/W
0 - The Transmit HDLC Controller will send out Bit-Oriented Signaling
(BOS) message.
1 - The Transmit HDLC Controller will send out LAPD protocol or so-called
Message-Oriented Signaling (MOS) message.
B
IT
N
UMBER
B
IT
N
AME
B
IT
T
YPE
B
IT
D
ESCRIPTION
3
ABORT
R/W
0 - No ABORT sequence is sent on the data link channel.
1 - The framer forces an ABORT sequence of pattern (111111 10) onto the
data link channel.