Activating the Turbo DMA mode for mE 4 Frame Grabbers
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Usually not required |
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The Turbo DMA mode is only relevant if you are using microEnable IV frame grabbers. Activation is only sensible if your application demands the maximum DMA bandwidth. |
If you activate the Turbo DMA mode, you can achieve a higher (the maximum) DMA bandwidth. However, not all mainboards support maximum DMA bandwidth. Therefore, the DMA Turbo mode is de-activated as default. You can test if your mainboard supports this mode by
- activating the Turbo DMA mode and
- carrying out a performance test to check if you achieve a higher DMA bandwidth using the Turbo DMA mode (see below).
Activating Turbo DMA Mode
To activate or deactivate the Turbo DMA mode:
- From the Tools menu, select System Configuration.
- In the dialog, select/unselect Activate Turbo DMA.
Performance Test
To check if your mainboard supports the Turbo DMA mode:
- De-activate the Turbo DMA mode (Menu Tools->System Configuration).
- Select the board you want to test.
- Start the performance test by clicking the according icon
from the toolbar, or by selecting from the menu Diagnosis->Performance.
The performance test is carried out using the applet that is the currently active applet on the frame grabber.
- The results of the performance test are displayed:
- Now activate the Turbo DMA mode (Menu Tools->System Configuration).
- Repeat the performance test by clicking the according icon
from the toolbar, or by selecting from the menu Diagnosis->Performance.
- Compare the results of both tests to see if your mainboard supports DMA Turbo mode:
- If you achieve a higher DMA bandwidth (and you need this maximum DMA bandwidth), leave the DMA Turbo mode activated.
- If the DMA bandwidth stays the same or is even lower than without Turbo DMA mode, turn Turbo DMA mode off.