XRT7250 Datasheet, PDF (3/463 Pages) Exar Corporation – DS3/E3 FRAMER IC

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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