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Altera_Forum
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17 years ago

Internal Error: SubSystem VPR20KMAIN

Hi All: I've just recently ran into a problem about 65% though the fitter stage of my design: Internal Error: Sub-system: VPR20KMAIN, File: /quartus/fitter/vpr20k/altera_arch_common/altera...
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Altera_Forum
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16 years ago

Hello Searchers,

I experienced a VERY similar problem with Quartus II 8.1, again an SOPC system targeting EP3C55U484C6, and it was also fixed by upgrading Cisco VPN from 4.8 to 5.0.

I installed Quartus 8.1 on a second build machine, and on the 2nd machine my design always crashed. Pulling design files and scripts from revision control system so very confident that source files were the same. Spent time checking assignment_defaults.qdf, environment variables, etc. to no avail.

The 2nd machine gave several different random errors, including VPR20K main subsystem, etc. After uninstall/reinstall several times, it began to consistently fail with:

Internal Error: Sub-system TDC, File: /quartus/tsm/tdc/tdc_accessories_analysis.cpp

sub_domain_slack_ratio < JUST_BELOW_HUGE_FLOAT.

Cisco VPN 4.8 was the culprit. No idea what is going on that causes Quartus to interact with VPN client (license check ? something more mysterious ?).

-- JMS