Teledyne Princeton Instruments PI-MTE, System Manual

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80 PI-MTE System Manual Issue 6
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
►
Hardware
►
Controller/CCD tab or the Acquisition
►
Experiment
Setup
►
Main tab.
4. Open Setup
►
Environment
►
Environment dialog box.
5. Increase the DMA buffer size to a minimum of:
• 32 MB;
• 64 MB if it is currently 32 MB;
• 128 MB if it is currently 64 Mb.
6. Click OK and then close WinView.
7. Reboot the host computer.
8. Launch WinView and begin acquiring data or focusing.
NOTE:
If this message is displayed again, increase the DMA buffer
size again.
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:
• 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 Driver , on page 33 for
complete information.
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
Contact Information
on page 116 for complete information.