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XRT84L38IB Datasheet(PDF) 4 Page - Exar Corporation |
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XRT84L38IB Datasheet(HTML) 4 Page - Exar Corporation |
4 / 451 page XRT84L38 áç áç áç áç OCTAL T1/E1/J1 FRAMER REV. 1.0.0 I TABLE OF CONTENTS GENERAL DESCRIPTION ................................................................................................. 1 Figure 1. XRT84L38 8-channel DS1 (T1/E1/J1) Framer ................................................................... 1 APPLICATIONS .............................................................................................................................................. 2 FEATURES .................................................................................................................................................... 2 ORDERING INFORMATION ............................................................................................................... 2 Figure 2. Pin Out of the XRT84L38 Top View (see pin list for names and function) .................... 3 TABLE OF CONTENTS ....................................................................................................... I TABLE 1: LIST BY PIN NUMBER ............................................................................................................ 16 PIN DESCRIPTIONS ........................................................................................................ 21 TRANSMIT SERIAL DATA INPUT .................................................................................................................... 21 OVERHEAD INTERFACE ............................................................................................................................... 30 RECEIVE SERIAL DATA OUTPUT .................................................................................................................. 32 RECEIVE DECODER LIU INTERFACE ............................................................................................................. 39 TRANSMIT ENCODER LIU INTERFACE ........................................................................................................... 39 TIMING ....................................................................................................................................................... 40 LIU CONTROL ............................................................................................................................................. 41 JTAG ........................................................................................................................................................ 42 MICROPROCESSOR INTERFACE .................................................................................................................... 43 GROUND PINS ............................................................................................................................................ 46 POWER SUPPLY PINS ................................................................................................................................. 46 NO CONNECT PINS ..................................................................................................................................... 47 ELECTRICAL CHARACTERISTICS ................................................................................................................... 48 ABSOLUTE MAXIMUMS ................................................................................................................................ 48 DC ELECTRICAL CHARACTERISTICS ............................................................................................................ 48 TABLE 2: XRT84L38 POWER CONSUMPTION ...................................................................................... 48 1.0 Microprocessor Interface Block ............................................................................................................ 49 TABLE 3: µC/µP SELECTION TABLE ..................................................................................................... 49 1.1 CHANNEL SELECTION WITHIN THE FRAMER ............................................................................................ 50 1.2 THE MICROPROCESSOR INTERFACE BLOCK SIGNAL ............................................................................... 50 TABLE 4: CHANNEL SELECTION ........................................................................................................... 50 Figure 3. Simplified Block Diagram of the Microprocessor Interface Block .............................. 50 TABLE 5: XRT84L38 MICROPROCESSOR INTERFACE SIGNALS THAT EXHIBIT CONSTANT ROLES IN BOTH THE INTEL AND MOTOROLA MODES ................................................................................................ 51 1.3 INTERFACING THE XRT84L38 TO THE LOCAL µC/µP VIA THE MICROPROCESSOR INTERFACE BLOCK ....... 52 1.3.1 Interfacing the Framer to the Microprocessor over an 8 bit wide bi-directional Data Bus ......... 52 TABLE 6: INTEL MODE: MICROPROCESSOR INTERFACE SIGNALS ........................................................... 52 TABLE 7: MOTOROLA MODE: MICROPROCESSOR INTERFACE SIGNALS .................................................. 52 1.3.2 Data Access Modes .................................................................................................................. 53 Figure 4. Intel µP Interface signals during Programmed I/O Read Operation ............................ 54 Figure 5. Intel µP Interface Signals during Programmed I/O Write Operation ........................... 55 Figure 6. Motorola µP Interface signals during a Programmed I/O Read Operation ................. 56 Figure 7. Motorola µP Interface signal during Programmed I/O Write Operation ...................... 57 Figure 8. Intel µP Interface Signals, during the Initial Read Operation of a Burst Cycle .......... 58 Figure 9. Intel µP Interface Signals, during subsequent Read Operations of a Burst I/O Cycle ... 60 Figure 10. Intel µP Interface signals, during the Initial Write Operation of a Burst Cycle ........ 62 Figure 11. µP Interface Signals, during subsequent Write Operations of a Burst I/O Cycle .... 63 Figure 12. Motorola µP Interface Signals during the Initial Read Operation of a Burst Cycle . 64 Figure 13. Motorola µP Interface Signals, during subsequent Read Operations of a Burst I/O Cy- cle ......................................................................................................................................... 65 Figure 14. Motorola µP Interface signals, during the Initial Write Operation of a Burst Cycle . 67 1.4 DMA READ/WRITE OPERATIONS ........................................................................................................... 68 |
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