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gschorcht's avatar
gschorcht
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4 years ago

Fitter can't fit a small design in Cyclone V SE that fits in a much smaller Cyclone IV device

Hi, When I try to compile a design for a Cyclone V 5CSEMA5 that works perfectly on a much smaller Cyclone IV, the fitter says: Info (170195): Router estimated average interconnect usage is 2% ...
sstrell's avatar
sstrell
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4 years ago

That is very odd.

Is it still saying the same signals cannot be routed? There must be something about them that is causing the issue. Are they part of an off-the-shelf IP you've added to the design from the IP Catalog? Perhaps the IP needs to be regenerated to work with the different device, though Quartus would usually indicate this to you.

Otherwise, I'm stumped.

gschorcht's avatar
gschorcht
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4 years ago

Yes, it's the same signals that can't be routed. The design does not use any IPs from the IP catalog with the exception of a PLL.

  • gschorcht's avatar
    gschorcht
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    4 years ago

    I could reduce the design to the module for which I get the routing errors, and I could reduce the module itself to the parts that don't fit. The reduced design can be found as an attachment.

    The design fits only if you comment out either line 117, line 123 or line 124 in the VGA_GraphicsController.sv file.