WIENER, Plein & Baus GmbH
14
www.wiener-d.com
In case of analyzing rare occurring VME bus failures / states it is possible to configure and
start the VM-DBA bus analyzer for a certain condition and leave it without being connected
via USB or running the XXDBAwin software. The red
AQ
LED indicates that the VM-DBA
is in acquire mode.
When the defined condition is matched the VM-DBA trigger is generated and the data are
stored in the internal memory which is shown by a flashing blue LED (
F4
). The data can be
then read-out and visualized via VME (VM-USB) or via a direct USB link using the
XXWinDBA software.
After reading the data the blue F4 LED will stop flashing and stay on until the acquisition is
cleared or a new is started.
Possible Trigger Conditions:
Hardware input (jumper selectable NIM/TTL)
Masked IRQ
Bus Error (BERR)
Address and Address Modifier combinations:
o
(Valid A) AND NOT (Valid AM)
o
NOT (Valid A) AND (Valid AM)
o
(Valid A) AND (Valid AM)
o
NOT (Valid A) OR NOT (Valid AM)
By selecting a trigger condition the matching input fields will be displayed. All inputs consist
of a mask and actual values to match the condition shown in left to the input fields.
Time Base / Range
The sampling frequency can be selected to be:
100MHz: 10ns steps / 20
µs full range
200MHz: 5ns steps / 10
µs full range
The Pre-trigger number of samples can be defined and has to be less than the total number of
samples 2048. The remaining samples (2048 – “pre-trigger”) are for the time after the trigger
condition. Changing the Pre-trigger setting will require to set and acquire again.
4.2.5
Waveforms Display
When selecting the VME bus lines a new window “Waveforms” will be displayed showing
the selected bus lines as a function of time (waveforms). The display shows the time scale
and allows to set / move cursors to change the view and measure time intervals.
Short Keys:
Z
zoom to the area between cursors, when both cursors are present.
A
zoom to all 2048 time steps.
O
zoom out around the crosshair pointer by factor of 2
L
shift the viewing window left by 100 time steps.
R
shift the viewing window right by 100 time steps.
C
Center around the pointer
