XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 98

• 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

XRT84L38
OCTAL T1/E1/J1 FRAMER
Synchronization Mux Register (SMR) - E1 Mode (Indirect Address = 0xn0H, 0x09H)
E bit Source
B
B
Select bit 1
IT
IT
B
N
R/W
N
7-6
IT
UMBER
0
0
UMBER
5
7
E bit Source
Framing Bit Source
E bit Source Select
Reserved
Select bit 0
B
R/W
IT
0
6
B
B
IT
IT
N
N
AME
AME
Reserved
B
R/W
IT
0
5
B
B
Synchroniza-
IT
IT
R/W
R/W
tion Signal
Direction
T
T
YPE
YPE
B
R/W
IT
0
4
Framing Bit Source:
This READ/WRITE bit-field permits the user to determine where
the framing alignment bits should be inserted.
When this bit is zero:
The framing alignment bits are generated and inserted by the
framer internally.
When this bit is one:
If the framer is operating in normal 1.544Mbit/s mode, the fram-
ing alignment bits are passed through from the Transmit Serial
Data input (TxSer_n).
E Source Select:
These READ/WRITE bit-fields permits the user to determine
where the E bits should be inserted and what the E bits should
be.
When these bits are 00:
The E bits are generated and inserted by the framer internally.
When these bits are 01:
The E bits are forced to be "0" and are inserted by the framer
internally. When these bits are 10:The E bits are forced to be "1"
and are inserted by the framer internally.
When these bits are 11:
Source of the E bits is HDLC controller of the framer. The E bits
are used to carry data link messages.
78
Select bit 1
Data Link
Transmit
Source
B
R/W
IT
0
3
Select bit 0
Data Link
Transmit
Source
B
B
B
R/W
IT
IT
IT
0
D
D
2
ESCRIPTION
ESCRIPTION
CRC-4
Source
B
R/W
IT
0
1
Framing Bit
Source
REV. 1.0.1
B
R/W
IT
0
0