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Altera_Forum
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17 years ago

Can not dowload the code into my Altera

I met a weird problem: I can download the code into my Altera chip EPM240T100 comfortably at the first time. But, I can not download the code again. The errors are: Error: Can't access JTAG cha...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

The LED driving pin was set as output pin "driving unspecified signals". It is a used pin instead of "unused" pin. I tested in the board without cutting any connections while setting the "All unused reserved pins" as "Input tri-stated with weak pull-up resistor". Then, I could load the code into the board but LED could not be lit anymore....