XRT94L33_07 Datasheet, PDF (739/862 Pages) Exar Corporation – 3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER - ATM REGISTERS

Rev222...000...000
XRT94L33
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Table 637: TxE3 LAPD Configuration Register – G.832 (Address Location= 0xN333)
BIT 7
R/O
0
BIT 6
BIT 5
Unused
R/O
R/O
0
0
BIT 4
R/O
0
BIT 3
Auto
Retransmit
R/W
1
BIT 2
Reserved
R/O
0
BIT 1
TxLAPD
Message Length
R/W
0
BIT 0
TxLAPD
Enable
R/W
0
BIT NUMBER
7-4
3
2
1
0
NAME
Unused
Auto
Retransmit
Reserved
TxLAPD
Message
Length
TxLAPD
Enable
TYPE
R/O
DESCRIPTION
R/W Auto-Retransmit of LAPD Message:
This READ/WRITE bit-field permits the user to configure the LAPD Transmitter
to transmit PMDL messages, repeatedly at one-second intervals. Once the
user enables this feature, and then commands the LAPD Transmitter to
transmit a given PMDL Message; the LAPD Transmitter will then proceed to
transmit this PMDL Message (based upon the contents within the Transmit
LAPD Message Buffer) repeatedly at one second intervals.
0 – Disables the Auto-Retransmit Feature.
In this case, the PMDL Message will only be transmitted once, afterwards the
LAPD Transmitter will proceed to transmit a continuous stream of Flag
Sequence octets (0x7E) via the DL bits, within each output DS3 frame. No
more PMDL Messages will be transmitted until the user commands another
transmission.
1 – Enables the Auto-Retransmit Feature.
In this case, the LAPD Transmitter will transmit PMDL messages (based upon
the contents within the Transmit LAPD Buffer) repeatedly at one-second
intervals.
Note: This bit-field is ignored if the LAPD Transmitter is disabled.
R/O
R/W Transmit LAPD Message Length Select:
This READ/WRITE bit-field permits the user to specify the length of the payload
data within the outbound LAPD/PMDL Message, as indicated below.
0 – Configures the LAPD Transmitter to transmit a LAPD/PMDL message that
has a payload data size of 76 bytes.
1 – Configures the LAPD Transmitter to transmit a LAPD/PMDL message that
has a payload data size of 82 bytes.
R/W LAPD Transmitter Enable:
This READ/WRITE bit-field permits the user to enable the LAPD Transmitter,
within the channel. Once the user enables the LAPD Transmitter, it will
immediately begin transmitting the Flag Sequence octet (0x7E) to the remote
terminal via the outbound “DL” bits, within each DS3 data stream. The LAPD
Transmitter will continue to do this until the user commands the LAPD
Transmitter to transmit a PMDL Message.
0 – Disables the LAPD Transmitter.
1 – Enables the LAPD Transmitter.
Table 638: TxE3 LAPD Status/Interrupt Register – G.832 (Address Location= 0xN334)
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