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Yes I allready did that, it's a Mezzanine board normally tested in a system.
But also possible to test it seperately.
It's not only the TDO but I think the complete TAP is disappeared after erase with quartus. I tried to put the device in extest but nothing happened.
The only thing I can think of is that the erase action is writing something in the private registers ( see the last lines from the ep2s60 bsdl) :
"The following private instructions must not be used as they"&
"may render the device inoperable:"&
" "&
" 1100010000 "&
" 0011001001 "&
" 0000101001 "&
" 0000010000 "&
" "&
"Customer should take precautions not to invoke these instructions"&
"at any time. Contact Altera Applications for further assistance.";
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Hi,
sorry I'm not a JTAG expert. Maybe you should contact the altera Application guy's.
Kind regards
GPK
Honored Contributor
