XRT72L56 Datasheet, PDF (302/486 Pages) Exar Corporation – SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L56
SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
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PRELIMINARY
The relationship between the contents of bit-fields 1
and the LAPD Message size is given in Table 54.
TABLE 54: RELATIONSHIP BETWEEN TXLAPD MSG LENGTH AND THE LAPD MESSAGE SIZE
TXLAPD MESSAGE LENGTH
0
1
LAPD MESSAGE LENGTH
LAPD Message size is 76 bytes
LAPD Message size is 82 bytes
NOTE: The Message Type selected must correspond with
the contents of the first byte of the Information (Payload)
portion, as presented in Table 53.
STEP 5 - Specify whether the LAPD Transmitter
should transmit the LAPD Message frame only
once, or an indefinite number of times at one-sec-
ond intervals.
The Transmit E3 HDLC Control block allows the user
to configure the LAPD Transmitter to transmit this
LAPD Message frame only once, or an indefinite
number of times at one-second intervals. The user
implements this configuration by writing the appropri-
ate value into Bit 3 (Auto Retransmit) within the Tx E3
LAPD Configuration Register (Address = 0x33), as
depicted below.
)
TXE3 LAPD CONFIGURATION REGISTER (ADDRESS = 0X33)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Not Used
Auto
Retransmit
Not Used
TxLAPD
Msg Length
TxLAPD
Enable
RO
RO
RO
RO
R/W
RO
R/W
R/W
0
0
0
0
1
0
0
0
If the user writes a “1” into this bit-field, then the
LAPD Transmitter will transmit the LAPD Message
frame repeatedly at one-second intervals until the
LAPD Transmitter is disabled.
If the user writes a “0” into this bit-field, then the
LAPD Transmitter will transmit the LAPD Message
frame only once. Afterwards, the LAPD Transmitter
will halt its transmission until the user invokes the
Transmit LAPD Message frame command, once
again.
STEP 5 - Enabling the LAPD Transmitter
Prior to the transmission of any data via the LAPD
Transmitter, the LAPD Transmitter must be enabled.
This is accomplished by writing a "1" to bit 0 (TxLAPD
Enable) of the Tx E3 LAPD Configuration Register, as
depicted below.
TRANSMIT E3 LAPD CONFIGURATION REGISTER (ADDRESS = 0X33)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT2
BIT 1
BIT 0
Not Used
Auto
Retransmit
Not Used
TxLAPD
Msg Length
TxLAPD
Enable
R/O
R/O
R/O
E/O
R/W
R/O
R/W
R/W
0
0
0
0
X
0
X
1
If the user writes a “0” into this bit-field, then the
LAPD Transmitter will be enabled, and the LAPD
Transmitter will immediately begin to transmit a con-
tinuous stream of Flag Sequence octets (0x7E), via
the “N” bit-field of each outbound E3 frame.
Conversely, if the user writes a “1” into this bit-field,
then the LAPD Transmitter will be disabled. The
Transmit E3 Framer block will automatically insert a
“1” into the “N” bit-field, within each outbound E3
frame. No transmission of PMDL data will occur.
STEP 7 - Initiate the Transmission
At this point, the user should have written the PMDL
message into the on-chip Transmit LAPD Message
buffer and the type of LAPD Message that is desired
to be transmitted should have been specified. Finally,
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