XRT79L71_1 Datasheet, PDF (139/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

REV. 1.0.0
XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
Transmit DS3 LAPD Configuration Register (Address = 0x1133)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
Transmit
LAPD
Any
Unused
Auto
Retransmit
BIT 2
Reserved
R/W
R/O
R/O
R/O
R/W
R/O
0
0
0
0
1
0
BIT 1
Transmit
LAPD
Message
Length
R/W
0
BIT 0
Transmit
LAPD
Enable
R/W
0
BIT NUMBER
NAME
7
Transmit LAPD Any
6-4
Unused
TYPE
R/W
R/O
DESCRIPTION
Transmit LAPD - Any kind:
This READ/WRITE bit-field permits the user to configure the
Transmit LAPD Controller block to transmit any kind of LAPD
Message (or HDLC Message) with a size of 82 byte or less. If
the user implements this option, then the Transmit LAPD Con-
troller block will be capable of transmitting any kind of HDLC
frame (with any value of header bytes). The only restriction is
that the size of the HDLC frame must not exceed 82 bytes.
0 - Does not invoke this Any Kind of HDLC Message feature. In
this case, the Transmit LAPD Controller block will only transmit
HDLC Messages that contains the Bellcore GR-499-CORE val-
ues for SAPI and TEI.
1- Invokes this Any Kind of HDLC Message feature. In this case,
the Transmit LAPD Controller block will be able to transmit
HDLC Messages that contain any header byte values.
NOTE:
If the user invokes the Any Kind of HDLC Message
feature, then the user must indicate the size of the
information payload (in terms of bytes) within the
Transmit LAPD Byte Count Register (Address =0x1183).
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