Article ID: 000074835 Content Type: Error Messages Last Reviewed: 07/02/2014

Error (10779): VHDL error at < filename.vhd >: expression is not constant.

Environment

    Quartus® II Subscription Edition
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Description

Due to a problem in the Quartus® II software version 13.1 and earlier, you may see this error message if you use a variable as an index for signal.

For example :

data(a downto b) where a and b are variables

Resolution

To workaround this problem, use a 3rd party synthesis tool or avoid this code construct.

This problem is scheduled to be fixed in a future release of the Quartus II software.

Related Products

This article applies to 1 products

Intel® Programmable Devices

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