Hytec Electronics Ltd.

VME Bus Monitor Display & Data/Address Generator Module Type VDS 2081

Product Description

The VME VDS 2081 Bus Monitor and Display module allows users to examine the VME bus address/data by LED display, and to generate data words by front panel switches for identification, and debug/test purposes.

The module can be resident in each VME crate to allow programmers and engineers to easily see data/address bits being displayed. The VDS 2081 can also be used to generate word patterns by switches on the front panel; all the address and data bits are displayed by LEDs.

Features

  • Full display of all bus address/data bits by numbered LEDs.
  • Cost effective module selection allowing a module to be located in each VME crate.
  • 32 Bit word identification, debug/test word be can generated.
  • Read back of last address, address modifiers and data not to this modules address.

The product consists of a single 6U Euro Card with both connectors fitted and operates as a D32,/A16, A24 or A32 device. It can operate in three main modes:–

  • a) Direct Data Mode
    This mode merely continuously monitors the 32 Data, the 31 Address lines, the 6 Address Modifier (AM) lines, the Long Word (LW) signal and the Read/Write line and displays them. Any command addressed to the module in this mode will be ignored.
  • b) Auto Reply Mode
    In this mode the module monitors the front panel switches and uses them as an address. If detected with any AM combination it will raise ’DTACK’ without any transfer of data. This mode is useful for keeping the system running if a device fails to reply. The front panel LEDs display the address/data combinations present during the last transfer. Again any command addressed to the modules unique address will be ignored.
  • c) Normal Mode
    In this mode the LEDs again display the address/data combinations present during the last transfer. In addition the module will respond to its own unique 32 bit address set on its internal switches with five register read combinations and one write:–
    • A 32 Bit internal register which can be written and read.
    • A 32 Bit front panel switch register which can act as a source.
    • A 32 Bit read of the last address not to this module.
    • A 32 Bit read of the last data not to this module.
    • A 8 Bit read of the AM/LW/W combination of the last transfer not addressed to this module.

In all the modes the +5v, +12v and –12v lines are monitored and a green LED is illuminated if all are within tolerance.

In addition the module can also provide both system clock and/or power–on reset if desired. A front panel switch can also provide a system reset if operated.

Bus Error and System Reset are also monitored and the duration extended for front panel display.


Our policy is one of continuous product development and the right is reserved to supply equipment which may vary slightly from that described.



Hytec Electronics Ltd
Post : 5 Cradock Road, Reading, Berkshire, RG2 0JT, England.
Phone : +44 (0)118 9757770
Fax : +44 (0)118 9757566

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Last modified: September 24, 2008