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ID: 209
Case Type: faq
Category: Device Programming
Related To: ispVM System
Family: All FPGA

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How to solve the issue of "ispVM System  doesn't detect  parallel port ISP Download Cable" ?

There are several possible causes for a download cable not being found. Below are several things to check for.

  1. First, scan for your cable to see if it can be auto detected. Sometimes the cable just hasn't been auto detected and the options are setup for a different type of cable.
    1. Open ispVM. Go to "Options" -> "Cable and IO Port Setup..."
    2. Click "Auto Detect".
    3. If your cable is not found, first check to make sure it is seated correctly into the parallel port. 
  2. If Auto Detect still does not work, check to make sure the port and / or the cable is good.
    This is generally a good idea to start with. Try hooking up another
    parallel port cable to see if it works on your computer. Then try
    hooking your cable to another computer and see if it works. This is a
    good sanity check to make sure your port and cable are working.
  3. Check to see if the Parallel Port Drivers were installed.
    This can happen in systems where ispVM is installed without administrator privileges. You can reinstall your drivers by following these directions:
    1. Make sure you log in with Administrator privileges and open ispVM.
    2. Go to ispTools.
    3. Click on "Install/Uninstall LSC USB/Parallel Port Driver...".
    4. Click on install and hit yes for both pop-up screens.
    5. Click "close" and when it asks to reboot, say "yes" (make sure the parallel port cable is plugged into the system at this time).
  4. Check that the Parallel Port address is correct.
    An incorrect address can occur  for several reasons.
    1. Some systems have their parallel port setup differently directly in the bios. You can check this by going into your bios on start-up (F2 at boot) and checking your lpt port settings. It should give you the address here.
    2. If you have a PCI parallel port card it's possible that the software is setting the lpt port address to a different location from what the bios is setup for. Go into the configuration software that came with your parallel port card and check to see what the address range is set to.
      Once you can find the correct address specified for the lpt port, the ispVM tool allows a user to specify a custom port address. Use the options listed first to get to the "Cable and IO Port Setup..." menu. Check the circle that says "Custom Port: 0x" and list the custom port.
    3. Parallel port TYPE is other than what's recommended.
      We recommend that the parallel port be set to "ECP" mode in the system BIOS. This can be changed by entering the BIOS at boot up (usually F2) and going into the lpt port options.