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.
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