XRT72L56 Datasheet, PDF (303/486 Pages) Exar Corporation – SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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PRELIMINARY
XRT72L56
SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
the user should have enabled the LAPD Transmitter.
The only remaining to do is initiate the transmission of
this message. This process is initiated by writing a
“1” to Bit 3 (Tx DL Start) within the Tx E3 LAPD Sta-
tus and Interrupt Register (Address = 0x34), as de-
picted below.
)
TXE3 LAPD STATUS AND INTERRUPT REGISTER (ADDRESS = 0X34)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Not Used
TxDL Start TxDL Busy
TxLAPD
Interrupt
Enable
TxLAPD
Interrupt
Status
RO
RO
RO
RO
R/W
RO
R/W
RUR
0
0
0
0
0
0
0
0
A “0” to “1” transition in Bit 3 (Tx DL Start) in this reg-
ister, initiates the transmission of LAPD Message
frames. At this point, the LAPD Transmitter will begin
to search through the PMDL message, which is resid-
ing within the Transmit LAPD Message buffer. If the
LAPD Transmitter finds any string of five (5) consecu-
tive “1’s” in the PMDL Message then the LAPD Trans-
mitter will insert a “0” immediately following these
strings of consecutive “1’s”. This procedure is known
as stuffing. The purpose of PMDL Message stuffing
is to insure that the user’s PMDL Message does not
contain strings of data that mimic the Flag Sequence
octet (e.g., six consecutive “1’s”) or the ABORT Se-
quence octet (e.g., seven consecutive “1’s”). After-
wards, the LAPD Transmitter will begin to encapsu-
late the PMDL Message, residing in the Transmit
LAPD Message buffer, into a LAPD Message frame.
Finally, the LAPD Transmitter will fragment the out-
bound LAPD Message frame into bits and will begin
to transport these bits via the N bit-field within each
outbound E3 frame.
While the LAPD Transmitter is transmitting this LAPD
Message frame, the TxDL Busy bit-field (Bit 2) within
the Tx E3 LAPD Status and Interrupt Register, will be
set to “1”. This bit-field allows the user to poll the sta-
tus of the LAPD Transmitter. Once the LAPD Trans-
mitter has completed the transmission of the LAPD
Message, then this bit-field will toggle back to “0”.
The user can configure the LAPD Transmitter to inter-
rupt the local Microprocessor/Microcontroller upon
completion of transmission of the LAPD Message
frame, by setting bit-field “1” (TxLAPD Interrupt En-
able) within the Tx E3 LAPD Status and Interrupt reg-
ister (Address = 0x34). to “1” as depicted below.
)
TXE3 LAPD STATUS AND INTERRUPT REGISTER (ADDRESS = 0X34)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Not Used
TxDL Start TxDL Busy
TxLAPD
Interrupt
Enable
TxLAPD
Interrupt
Status
RO
RO
RO
RO
R/W
RO
R/W
RUR
0
0
0
0
X
X
1
X
‘The purpose of t his interrupt is to let the Micropro-
cessor/Microcontroller know that the LAPD Transmit-
ter is available and ready to transmit a LAPD Mes-
sage frame (which contains a new PMDL Message)
to the remote terminal equipment. Bit 0 (Tx LAPD In-
terrupt Status) within the Tx E3 LAPD Status and In-
terrupt Register will reflect the status for the Transmit
LAPD Interrupt.
NOTE: This bit-field will be reset upon reading this register.
Summary of Operating the LAPD Transmitter
Once the user has invoked the TxDL Start command,
the LAPD Transmitter will do the following.
• Generate the four octets of the LAPD Message
frame header (e.g., the Flag Sequence, SAPI, TEI,
Control, etc.,) and insert them into the header byte
positions within the LAPD Message frame.
• It will read in the contents of the Transmit LAPD
Message buffer (e.g., the PMDL Message data)
and insert it into the Information Payload portion of
the LAPD Message frame.
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