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Altera_Forum's avatar
Altera_Forum
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18 years ago

Cyclone II programming problems

Hi all -- I've built a few PCBs based on Cyclone II FPGAs. Some of these boards, and especially the last, suffer from an annoying problem: When connecting the FPGA to the JTAG cable, Quart...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

Hello,

I see, that you have been working very seriously on the problem. However, the issue looks really strange and unusual to me, there must be a simple, understandable reason.

To my opinion, Cyclone II configuration is rather easy to get along with, e. g. AS configuration memory programming is more sensitive to signal quality issues than JTAG. I can program Cyclone II JTAG with USB Blaster through a 1 meter IDC cable with no problems on all boards, I have ever used. I still wonder, if there is something special in wiring of configuration related pins in your design.

Regards,

Frank