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XRT7250IQ100 Datasheet

  • XRT7250IQ100

  • DS3/E3 FRAMER IC

  • 463頁(yè)

  • EXAR   EXAR

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謾莽
MARCH 2001
XRT7250
DS3/E3 FRAMER IC
REV. 1.1.1
GENERAL DESCRIPTION
The XRT7250 DS3/E3 Framer IC is designed to ac-
cept 鈥淯ser Data鈥?from the Terminal Equipment and in-
sert this data into the 鈥減ayload鈥?bit-fields within an
鈥渙utbound鈥?DS3/E3 Data Stream. Further, the Framer
IC is also designed to receive an 鈥渋nbound鈥?DS3/E3
Data Stream (from the Remote Terminal Equipment)
and extract out the 鈥淯ser Data鈥?
The XRT7250 DS3/E3 Framer is designed to support
full-duplex data flow between Terminal Equipment
and an LIU (Line Interface Unit) IC. The Framer De-
vice will transmit, receive and process data in the
DS3-C-bit Parity, DS3-M13, E3-ITU-T G.751 and E3-
ITU-T G.832 Framing Formats.
The XRT7250 DS3/E3 Framer IC consists of four sec-
tions.
The Transmit Section, includes a Transmit Payload
Data Input Interface, a Transmit Overhead data Input
Interface Section, a Transmit HDLC Controller, a
Transmit E3/DS3 Framer block and a Transmit LIU In-
terface Block which permits the Terminal Equipment
to transmit data to a remote terminal.
The Receive Section, consists of a Receive LIU Inter-
face, a Receive E3/DS3 Framer, a Receive HDLC
Controller, a Receive Payload Data Output Interface,
and a Receive Overhead Data Interface which allows
BLOCK DIAGRAM OF XRT7250
TxOHFrame
TxOHEnable
TxOH
TxOHClk
TxOHIns
TxOHInd
TxSer
TxNib[3:0]
TxInClk
TxNibClk
TxFrame
the local terminal equipment to receive data from re-
mote terminal equipment.
The Microprocessor Interface is used to configure the
Framer IC in different operating modes and monitor
the performance of the Framer.
The Performance Monitor Section consists of a large
number of "Reset-upon-Read" and "Read-Only" reg-
isters that contain cumulative and "one-second" sta-
tistics that reflect the performance/health of the Fram-
er IC/system.
FEATURES
鈥?/div>
Transmits, Receives and Processes data in the
DS3-C-bit Parity, DS3-M13, E3-ITU-T G.751 and
E3-ITU-T G.832 Framing Formats.
鈥?/div>
Interfaces to all Popular Microprocessors
鈥?/div>
Integrated Framer Performance Monitor
鈥?/div>
Available in a 100 Pin PQFP package
鈥?/div>
Operating Temperature -40擄C to +85擄C
APPLICATIONS
鈥?/div>
Interface to DS3 or E3 Networks
鈥?/div>
CSU/DSU Equipment.
鈥?/div>
PCM Test Equipment
鈥?/div>
Fiber Optic Terminals
Transmit Overhead
Input
Interface Block
Transmit
Payload Data
Input
Interface Block
TxPOS
Transmit DS3/E3
Framer Block
Transmit LIU
Interface
Block
TxNEG
TxLineClk
MOTO
D[7:0]
A[8:0]
Int
CS
Rd_DS
Wr_RW
Rdy_Dtck
Reset
ALE_AS
Tx LAPD Buffer/
Controller
Microprocessor
Interface
Rx LAPD Buffer/
Controller
RxSer
RxNib[3:0]
RxOutClk
RxNibClk
RxFrame
RxOHFrame
RxOH
RxOHClk
RxOHEnable
Receive Payload
Data Output
Interface Block
RxPOS
Receive DS3/E3
Framer Block
Receive LIU
Interface
Block
RxNEG
RxLineClk
Receive Overhead
Output
Interface Block
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
鈥?/div>
(510) 668-7000
鈥?/div>
FAX (510) 668-7017
鈥?/div>
www.exar.com

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