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XRT84L38IB Datasheet(PDF) 4 Page - Exar Corporation

Part # XRT84L38IB
Description  OCTAL T1/E1/J1 FRAMER
Download  451 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT84L38IB Datasheet(HTML) 4 Page - Exar Corporation

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XRT84L38
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OCTAL T1/E1/J1 FRAMER
REV. 1.0.0
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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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