XRT72L71 Datasheet, PDF (67/102 Pages) Exar Corporation – DS3 ATM UNI/CLEAR CHANNEL FRAMER

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REGISTER 30
BIT
FUNCTION
7-5 Unused
4 Reserved
3 Auto Retransmit
2 Tx LAPD Type(1)
1 Tx LAPD Type(0)
0 Tx LAPD Enable
XRT72L71
DS3 ATM UNI/CLEAR CHANNEL FRAMER
REV. 1.1.0
TABLE 31: TX DS3 LAPD CONFIGURATION REGISTER
TX DS3 LAPD CONFIGURATION REGISTER
HEX ADDRESS: 0X1E
TYPE
RO
DEFAULT
0
DESCRIPTION-OPERATION
R/W
0
Set bit to 0
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-
R/W
1
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.
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)
R/W
0
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.
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
R/W
0
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.
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