XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 121

• Manufacturer Part Number: XRT84L38IB
• Description: Network Controller & Processor ICs 8 Ch T1/E1 Framer
• Manufacturer: Exar Corporation

Specifications of XRT84L38IB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

REV. 1.0.1
B
IT
N
UMBER
4
3
2
1
Automatic Receive LAPD
Message
Transmit ABORT
Sequence
Transmit IDLE/FLAG
Sequence
Transmit LAPD Message
with FCS
B
IT
N
AME
B
IT
R/W
R/W
R/W
R/W
T
YPE
Automatic Receive LAPD Message:
This READ/WRITE bit-field configures the Receive LAPD Con-
troller of the framer to compare and discard any incoming LAPD
message that exactly match which is currently stored in the
Receive LAPD Controller.
When this bit is set to zero:
The Receive LAPD Controller does not discard any incoming
LAPD message. Every incoming LAPD message automatically
stores in the Receive LAPD Controller and overwrites the previ-
ous received LAPD message.
When this bit is set to one:
The Receive LAPD Controller compares any incoming LAPD
message with the previous message that is currently stored in
the Received LAPD Controller. If the incoming LAPD message is
the same as the previous one, it will be automatically discarded.
Transmit ABORT Sequence:
This READ/WRITE bit-field configures the Transmit LAPD Con-
troller to transmit an ABORT sequence into the Facility Data Link
channel to the remote terminal. An ABORT sequence is a string
of seven or more consecutive ones.
When this bit is set to zero:
The Transmit LAPD Controller does not insert an ABORT
sequence into the Facility Data Link channel.
When this bit is set to one:
The transmit LAPD Controller inserts an ABORT sequence into
the Facility Data Link channel.
Transmit IDLE/FLAG Sequence:
This READ/WRITE bit-field configures the Transmit LAPD Con-
troller to insert a string of IDLE/Flag sequence into the Facility
Data Link channel to the remote terminal. An IDLE/FLAG
sequence is an octet of with value 0x7E.
When this bit is set to zero:
The Transmit LAPD Controller does not insert an IDLE/FLAG
sequence into the Facility Data Link channel.
When this bit is set to one:
The Transmit LAPD Controller inserts an IDLE/FLAG sequence
into the Facility Data Link channel.
Transmit LAPD Message with FCS:
This READ/WRITE bit-field forces the Transmit LAPD Controller
to include Frame Check Sequence (FCS) octets into the out-
bound LAPD message.
When this bit is set to zero:
The Transmit LAPD Controller does not include FCS octets into
the outbound LAPD message.
When this bit is set to one:
The Transmit LAPD Controller inserts FCS octets into the out-
bound LAPD message.
N
OTE
101
: This bit-field is ignored if the framer is configured to
operate in BOS mode.
B
IT
D
ESCRIPTION
OCTAL T1/E1/J1 FRAMER
XRT84L38