Article ID: 000085919 Content Type: Troubleshooting Last Reviewed: 09/11/2012

Why does the Design Space Explorer return unknown values when compiling designs targeting Cyclone II or Stratix II devices?

Environment

BUILT IN - ARTICLE INTRO SECOND COMPONENT
Description

Due to a problem in the Quartus® II software, the Design Space Explorer may return unknown values when compiling designs targeting Stratix® II or Cyclone® II devices. This problem occurs when the Design Space Explorer attempts to use the deprecated Classic Timing Analyzer instead of the TimeQuest timing analyzer.

To work around this problem, add the following assignment to your Quartus II Settings File (.qsf):

set_global_assignment -name USE_TIMEQUEST_TIMING_ANALYZER ON

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

Related Products

This article applies to 3 products

Cyclone® II FPGA
Stratix® II GX FPGA
Stratix® II FPGAs