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Altera_Forum's avatar
Altera_Forum
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15 years ago

Problem with JTAG

Hi everybody I've a problem with my MAXII I can't tranfert my program with quartus. When my CPLD is under 3V I measure an impedance of 10K on TDI and more than 1M for other between ground ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

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"TMS: nothing" means, the pin is either shorted or the programmer connection broken. You have to fix this first.

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I try again to find what's going on this pin.

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P.S.:

Seems like the design lacks the suggested TCK pulldown resistor.

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I've read that altera device had intern weak pull up/down resistor and that was useless to add external resistor. But I'll try it too.

Thanks for your help. I'll post when I've fix it (or not :cry:).