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Details, datasheet, quote on part number:XRT7250IQ
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DECEMBER 2000
XRT7250
DS3/E3 FRAMER IC
REV. 1.1.0
GENERAL DESCRIPTION The XRT7250 DS3/E3 Framer IC is designed to accept "User Data" from the Terminal Equipment and inser t 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 Device will transmit, receive and process data in the DS3-C-bit Parity, DS3-M13, E3-ITU-T G.751 and E3ITU-T G.832 Framing Formats. The XRT7250 DS3/E3 Framer IC consists of four sections. 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 Interface Block which permits the Terminal Equipment to transmit data to a remote terminal. The Receive Section, consists of a Receive LIU Interface, 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
the local terminal equipment to receive data from remote 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" registers that contain cumulative and "one-second" statistics that reflect the performance/health of the Framer 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 AP PLICATIONS · Interface to DS3 or E3 Networks · CSU/DSU Equipment. · PCM Test Equipment · Fiber Optic Terminals
ResetB* TestMode NibbleLnTF
T3/E3 Transmit Overhead Interface
TxOHEnable TxOHClk TxOHFrame TxAISEn TxOH TxOHIns
TxLineClk[n:0] TxPOS[n:0] TxNEG[n:0] LIU Interface RxLineClk[n:0] RxPOS[n:0] RxNEG[n:0]
T 3 / E 3 Transmit Framer
T3/E3 transmit Input
TxOHInd[n:0] TxNibFrame[n:0] TxFrame[n:0] TxNibClk[n:0] TxLnClk[n:0] TxFrameRef[n:0] TxNib[3:0][n:0] TxSer[n:0]
pAddr[m:0] pData[7:0] pALE/AS pWR_L pRD_L(DS) pCS_L pDBEN_L pACK[1:0] pRdy_L/Dtack_L pReq[1:0] pType[2:0] pClk pINT_L
T 3 FEAC & Data L i n k Controller TAOS DMO TxLEV RLOOP LLOOP ENCODIS REQB ExtLOS RLOL
Performance Monitor
Interrupt Controller
uP Interface
LIU Controller T 3 / E 3 Receive Framer T3/E3 Receive Output
RxClk[n:0] RxOHind[n:0] RxFrame[n:0] RxNib[3:0][n:0] RxSer[n:0] RxOUTClk[n:0]
T3/E3 Receive Overhead Interface
RxOHEnable[n:0] RxOHClk[n:0] RxOH[n:0] RxAIS[n:0] RxLOS[n:0] RxRed[n:0] RxOHFrame[n:0] RxOOF[n:0]
Exar Corporation 48720 Kato Road, Fremont CA, 94538 · (510) 668-7000 · FAX (510) 668-7017 · www.exar.com
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PINOUT OF XRT7250 - 100-LEAD PQFP PACKAGE
DS3/E3 FRAMER IC
XRT7250
REV. 1.1.0
NC NC VDD NC GND Rdy_Dtck WR_RW CS ALE_AS RD_DS NC NC INT GND A0 A1 A2 A3 A4 A5 A6 A7 A8 VDD NibbleIntf GND MOTO RESET GND VDD
100
81
GND RxNib3 RxNib2 RxNib1 RxNib0 RxSer RxAIS RxClk GND RxFrame VDD RxOutClk RxRED RxOOF RxLOS RxOHClk RxOHInd RxO RxOHEnable RxOHFrame 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 80
1 0 0 Lead PQFP
51 50
VDD DMO ExtLOS RLOL RxPOS RxNEG RxLineClk NC GND REQ RLOOP LLOOP TAOS TxLEV ENCODIS TxPOS TxNEG TxLineClk VDD TxFrame GND TxNibClk TxNibFrame TxOHFrame TxOHEnable TxOHInd TxOH TxOHIns TxOHClk VDD
PART NUMBER XRT7250IQ
GND DQ D1 D2 D3 D4 D5 D6 D7 VDD TxFramRef GND TxInClk TxAISEn TxSer TxNib0 TxNib1 TxNib2 TxNib3 GND
ORDERING INFORMATION
PACKAGE 100 pin PQFP (24x18x3 mm) OPERATING TEMPERATURE -40°C to +85°C
2
XRT7250
REV. 1.1.0
DS3/E3 FRAMER IC
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TABLE OF CONTENTS
FEATURES ...... 1 APPLICATIONS ........ 1 BLOCK DIAGRAM OF XRT7250 ...... 1
ORDERING INFORMATION ........ 2 TABLE OF CONTENTS ....... I LIST OF FIGURES ........ X LIST OF TABLES ............ XVII PIN DESCRIPTIONS .......... 3 ELECTRICAL CHARACTERISTICS ........ 18
ABSOLUTE MAXIMUMS ........ DC ELECTRICAL CHARACTERISTICS ........ AC ELECTRICAL CHARACTERISTICS ........ AC ELECTRICAL CHARACTERISTICS (CONT.) ... 18 18 18 20
1.0 TIMING DIAGRAMS ....... 25 2.0 THE MICROPROCESSOR INTERFACE BLOCK .......... 36 2.1 THE MICROPROCESSOR INTERFACE BLOCK SIGNAL ........ 36 2.2 INTERFACING THE XRT7250 DS3/E3 FRAMER TO THE LOCAL µC/µP VIA THE MICROPROCESSOR INTERFACE BLOCK 38 2.3 ON-CHIP REGISTER ORGANIZATION ........ 51 PART NUMBER REGISTER (ADDRESS = 0X02) .. 58 VERSION NUMBER REGISTER (ADDRESS = 0X03) .......... 58 BLOCK INTERRUPT ENABLE REGISTER (ADDRESS = 0X04) ... 58 BLOCK INTERRUPT STATUS REGISTER (ADDRESS = 0X05) ... 59 RXDS3 CONFIGURATION & STATUS REGISTER (ADDRESS = 0X10) ..... 59 RXDS3 STATUS REGISTER (ADDRESS = 0X11) .......... 61 RXDS3 INTERRUPT ENABLE REGISTER (ADDRESS = 0X12) ... 61 RXDS3 INTERRUPT STATUS REGISTER (ADDRESS = 0X13) ... 62 RXDS3 SYNC DETECT ENABLE REGISTER (ADDRESS = 0X14) ....... 63 RXDS3 FEAC INTERRUPT ENABLE/STATUS REGISTER (ADDRESS = 0X17) .......... 64 RXDS3 LAPD CONTROL REGISTER (ADDRESS = 0X18) ........... 65 RXDS3 LAPD STATUS REGISTER (ADDRESS = 0X19) ..... 65 RXE3 CONFIGURATION & STATUS REGISTER 1 (ADDRESS = 0X10) ..... 66 RXE3 CONFIGURATION & STATUS REGISTER 2 (ADDRESS = 0X11) ..... 67 RXE3 INTERRUPT ENABLE REGISTER - 1 (ADDRESS = 0X12) .......... 68 RXE3 INTERRUPT ENABLE REGISTER - 2 (ADDRESS = 0X13) .......... 69 RXE3 INTERRUPT STATUS REGISTER - 1 (ADDRESS = 0X14) .......... 69 RXE3 INTERRUPT STATUS REGISTER - 2 (ADDRESS = 0X15) .......... 70 RXE3 LAPD CONTROL REGISTER (ADDRESS = 0X18) ..... 71 RXE3 LAPD STATUS REGISTER (ADDRESS = 0X19) ........ 72 RXE3 NR BYTE REGISTER (ADDRESS = 0X1A) .. 73 RXE3 GC BYTE REGISTER (ADDRESS = 0X1B) .......... 73 RXE3 TTB-0 REGISTER (ADDRESS = 0X1C) ....... 73 RXE3 TTB-1 REGISTER (ADDRESS = 0X1D) ....... 74 RXE3 TTB-2 REGISTER (ADDRESS = 0X1E) ....... 74 RXE3 TTB-3 REGISTER (ADDRESS = 0X1F) ....... 74 RXE3 TTB-4 REGISTER (ADDRESS = 0X20) ........ 75 RXE3 TTB-5 REGISTER (ADDRESS = 0X21) ........ 75
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