Meinberg VME31 Operating Instructions Manual
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Meinberg VME31 Operating Instructions Manual

Meinberg VME31 Operating Instructions Manual

Radio remote clock
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FUNKUHREN
Technical Information
Operating Instructions
VME31

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Summary of Contents for Meinberg VME31

  • Page 1 FUNKUHREN Technical Information Operating Instructions VME31...
  • Page 2 Werner Meinberg Auf der Landwehr 22 D-31812 Bad Pyrmont Phone ++49 52 81 / 9309-0 Fax: ++49 52 81 / 9309-30 Internet : http://www.meinberg.de E-Mail : info@meinberg.de December 17, 1997...

  • Page 3: Table Of Contents

    Table of Contents General Information about DCF77 ..........5 Overview ..................6 Configuration ................7 Setting the Base Address ..........7 Selecting the I/O Access Mode ........8 Installation ................... 8 Interface Description ..............8 Address Map ..............9 Using Periodic Interrupts ..........10 Interrupt Vector ..........

  • Page 5: General Information About Dcf77

    General Information about DCF77 The radio remote clocks made by Meinberg receive the signal from the long wave transmitter DCF77. This long wave transmitter installed in Mainflingen near Frank- furt/Germany transmits the reference time of the Federal Republic of Germany. This time reference is either the Central European Time (Mitteleuropäische Zeit, MEZ) or...

  • Page 6: Overview

    Overview The radio remote clock DCF77 VME31 receives the time marks from DCF77 and makes the decoded time available to VME bus systems. The clock is designed on a 3U board (euro card size), so it can be used in either 3U systems or 6U systems. An external ferrit antenna passes the signal from DCF77 to the on-board long wave receiver.

  • Page 7: Configuration

    Configuration Before the board can be installed in the VME bus rack, some jumpers must be configured as described below. The location of the jumpers can be seen from the component layout at the end of this manual. Setting the Base Address The base address of the dual port RAM on the board must be configured correspon- ding to the table shown below:...

  • Page 8: Selecting The I/O Access Mode

    Selecting the I/O Access Mode An additional jumper J1 must be configured to select the access mode: if the jumper is installed, the board can be accessed using Short Supervisor I/O (2Dh), otherwise the board is accessed using Short Non-Priviledged I/O (29h). Installation After the jumpers have been configured, the board can be installed in the VME bus rack.

  • Page 9: Address Map

    method is to read the clock interrupt driven or poll the 100th-of-seconds until the value changes: in both of the cases, the software has an interval of 10ms to read the desired data. Address Map The VME31 radio remote clock has a A16:D8 bus interface, so the dual port RAM must be accessed byte wide on odd address offsets related to the base address.

  • Page 10: Using Periodic Interrupts

    Using Periodic Interrupts If the clock shall generate periodic interrupts, three bytes must be written to the dual port RAM: Interrupt Vector After power up, this byte is set to 0Fh. The user must take care to set up the vector number corresponding to the system's exception vector assignments.

  • Page 11: Technical Specifications

    Technical Specifications RECEIVER: Narrow bandwidth receiver with automatic gain control Bandwidth: approx. 40Hz ANTENNA: Active external ferrite antenna in a plastic case Length of the cable: up to more than 100m Standard: SMB type connector, 5m of RG174 cable Outdoor: N type connector, RG58 cable, adapter RG58/RG174 DISPLAY: eight digit LED display shows date or time (selectable by...

  • Page 12: Ce Label

    SYSTEM BUS INTERFACE: VME bus A16:D8, slave Access: Short Supervisor I/O (2Dh) Short Non-priviledged I/O (29h) IRQ levels: 1..7, programmable DATA FORMAT: packed BCD PERIODIC INTERRUPTS: none, 10ms, 100ms, 1s, 10s, 1min, 10min, or 1h POWER REQUIREMENT: +5V @ 320mA PHYSICAL DIMENSION: 3U Euro card, 6U front panel optional...

  • Page 13: Component Layout

    Component Layout...

  • Page 15: Pin Assignments

    Pin Assignments /BG0IN /BG0OUT /BG1IN /BG1OUT /BG2IN /BG2OUT /SYSFAIL SYSCLK /BG3IN /BERR /BG3OUT /SYSRESET /LWORD /DS0 /WRITE /DTACK /IACK /IACKIN /IACKOUT /IRQ7 /IRQ6 /IRQ5 /IRQ4 /IRQ3 /IRQ2 /IRQ1 VCC in (+5V) VCC in (+5V) VCC in (+5V)

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