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XRT7250IQ100 Datasheet(PDF) 1 Page - Exar Corporation |
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XRT7250IQ100 Datasheet(HTML) 1 Page - Exar Corporation |
1 / 463 page Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com áç áç áç áç XRT7250 DS3/E3 FRAMER IC MARCH 2001 REV. 1.1.1 GENERAL DESCRIPTION The XRT7250 DS3/E3 Framer IC is designed to ac- cept “User Data” from the Terminal Equipment and in- sert this data into the “payload” bit-fields within an “outbound” DS3/E3 Data Stream. Further, the Framer IC is also designed to receive an “inbound” DS3/E3 Data Stream (from the Remote Terminal Equipment) and extract out the “User Data”. 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 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 • 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. • Interfaces to all Popular Microprocessors • Integrated Framer Performance Monitor • Available in a 100 Pin PQFP package • Operating Temperature -40°C to +85°C APPLICATIONS • Interface to DS3 or E3 Networks • CSU/DSU Equipment. • PCM Test Equipment • Fiber Optic Terminals BLOCK DIAGRAM OF XRT7250 Receive LIU Interface Block Receive DS3/E3 Framer Block Receive Payload Data Output Interface Block Microprocessor Interface MOTO D[7:0] A[8:0] Int CS Rd_DS Wr_RW Rdy_Dtck Reset ALE_AS RxSer RxNib[3:0] RxOutClk RxPOS RxNEG RxLineClk Tx LAPD Buffer/ Controller Rx LAPD Buffer/ Controller Receive Overhead Output Interface Block RxNibClk RxFrame Transmit Payload Data Input Interface Block Transmit DS3/E3 Framer Block Transmit LIU Interface Block TxSer TxNib[3:0] TxInClk TxPOS TxNEG TxLineClk Transmit Overhead Input Interface Block TxOHClk TxOHIns TxOHInd TxOH TxOHEnable TxOHFrame TxNibClk TxFrame RxOHFrame RxOH RxOHClk RxOHEnable |
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