XRT7250 datasheet(3/463 Pages) EXAR

3 / 463 page

XRT7250

DS3/E3 FRAMER IC

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REV. 1.1.1

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 .......................................................................................................................... 18

DC ELECTRICAL CHARACTERISTICS .................................................................................................. 18

AC ELECTRICAL CHARACTERISTICS .................................................................................................. 18

AC ELECTRICAL CHARACTERISTICS (CONT.) .................................................................................... 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 INTER-

FACE

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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