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XRT72L71
DS3 ATM UNI/CLEAR CHANNEL FRAMER
REV. 1.1.0
63
TABLE 31: TX DS3 LAPD CONFIGURATION REGISTER
REGISTER 30
TX DS3 LAPD CONFIGURATION REGISTER
HEX ADDRESS: 0X1E
BIT
FUNCTION
TYPE
DEFAULT
DESCRIPTION-OPERATION
7-5
Unused
RO
0
4
Reserved
R/W
0
Set bit to 0
3
Auto Retransmit
R/W
1
0: LAPD Transmitter will NOT automatically transmit a given PMDL (or LAPD
Message) repeatedly at one second intervals.
1: LAPD Transmitter will transmit a given PMDL (or LAPD Message) repeat-
edly at one second intervals.
NOTE: This bit-field is only active if the XRT72L71 has been configured to
support the “C-bit Parity” Framing format.
2
Tx LAPD Type(1)
R/W
0
00: LAPD message RAM Depth is 76 bytes (38 words)
01: LAPD message RAM Depth is 76 bytes (38 words)
10: LAPD message RAM Depth is 76 bytes (38 words)
11: LAPD message RAM Dept his 82 bytes (41 words)
NOTE: These bit-fields are only active if the XRT72L71 has been configured
to support the “C-bit Parity” Framing Format.
1
Tx LAPD Type(0)
R/W
0
Tx LAPD Enable
R/W
0
0: LAPD Transmitter is Disabled. The Transmit DS3 Framer block will set
each “outbound” DL bit-field to “1”.
1: LAPD Transmitter is Enabled. The LAPD Transmitter will begin to transmit
the Flag Sequence octet (0x7E), until a “Transmit LAPD Message” command
has been invoked.
NOTE: This bit-field is only active if the XRT72L71 has been configured to
support the “C-bit Parity” Framing format.