Change The Dma Buffer Setting; Data Overrun Occurred - Teledyne Princeton Instruments PI-MTE System Manual

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7.7.1

Change the DMA Buffer Setting

Perform the following procedure to change the DMA Buffer size configuration:
1. Click OK to dismiss the error dialog.
2. Reboot WinView.
3. Note the array size displayed in the Full Chip dimension field on the
Setup
Setup
4. Open Setup
5. Increase the DMA buffer size to a minimum of:
•
•
•
6. Click OK and then close WinView.
7. Reboot the host computer.
8. Launch WinView and begin acquiring data or focusing.
7.8

Data Overrun Occurred

Because of memory constraints and the way that USB transfers data, a Data overrun has
occurred message may be displayed during data acquisition. If this message is
displayed, perform one or more of the following actions:
•
•
•
•
•
•
•
If the problem persists, your application may be USB 2.0 bus limited. Since the host
computer controls the USB 2.0 bus, there may be situations where the host computer
interrupts the USB 2.0 port. In most cases, you will not notice the interrupt. However,
there are some instances when the data overrun cannot be overcome because USB 2.0
bus limitations combined with long data acquisition times and/or large data sets
increase the possibility of an interrupt while data is being acquired. If your experiment
requirements include long data acquisition times and/or large data sets, your
application may not be suitable for the USB 2.0 interface. If this is not the case and data
overruns continue to occur, contact Customer Support. Refer to
on page 116 for complete information.
PI-MTE System Manual
► ►
Hardware Controller/CCD tab or the Acquisition
►
Main tab.
►
Environment
32 MB;
64 MB if it is currently 32 MB;
128 MB if it is currently 64 Mb.
NOTE:
If this message is displayed again, increase the DMA buffer
size again.
Minimize the number of programs running in the background while you are
acquiring data with WinView/32.
Run data acquisition in Safe Mode.
Add memory.
Use binning.
Increase the exposure time.
Defragment the hard disk.
Update the Orange Micro USB2 driver.
Refer to Section 4.6.2, Update the OrangeUSB USB 2.0
complete information.
►
Environment dialog box.
Issue 6
►
Experiment
Driver, on page 33 for
Contact Information