XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 337

• 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
The purpose of the DS1 Transmit Framer block is:
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The following sections discuss functionalities of the DS1 Transmit Framer block in details. We will also
describe how to configure the XRT84L38 to transmit DS1 frames according to system requirement of users.
The XRT84L38 Octal T1/E1/J1 Framer supports the following DS1 framing formats:
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N
The table below shows configurations of the Framing Format Select [2:0] bits of the Framing Select Register
(FSR).
FRAMING SELECT REGISTER (FSR) (INDIRECT ADDRESS = 0XN0H, 0X07H)
9.2
9.2.1
OTE
N
To encode user data, inputted from the Terminal Equipment into a standard framing format.
To provide individual data control and signaling conditioning of each DS0 channel.
To support the transmission of HDLC messages, from the local transmitting terminal, to the remote receiving
terminal.
To transmit indications that the local receive framer has received error frames from the remote terminal.
To transmit alarm condition indicators to the remote terminal.
Super-Frame format (SF), also referred to as D4 framing
Extended Super-Frame format (ESF)
Non-signaling format (N)
T1DM framing format
SLCâ96 data link framing format, which use the Super-Frame (SF) framing structure
UMBER
B
2-0
: If the framer is configured to transmit DS1 frames according to one particular framing format, the receiving side of
IT
the framer is also configured to receive DS1 frames according to the same framing format. The user can set the
Framing Format Select [2:0] bits of the Framing Select Register (FSR) to determine which DS1 framing format
should XRT84L38 be configured to operate.
How to Configure the Framer to Transmit Data in Various DS1 Framing Formats
How to configure the framer to input framing alignment bits from different sources
T1 Framing Select
B
IT
N
AME
B
IT
R/W
T
YPE
T1 Framing Select:
These READ/WRITE bit-fields allow the user to select one of the five T1
framing formats supported by the framer. These framing formats include
ESF, SLCâ96, SF, N and T1DM mode.
N
OTE
: Changing of framing format automatically forces the framer to
perform re-synchronization.
317
Framing
SLC®96
Format
T1DM
ESF
SF
N
B
Bit 2
IT
0
1
1
1
1
D
ESCRIPTION
Bit 1
X
0
0
1
1
OCTAL T1/E1/J1 FRAMER
Bit 0
X
0
1
0
1
XRT84L38