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Vasudev's avatar
Vasudev
Icon for New Contributor rankNew Contributor
5 years ago

JTAG scan chain broken

Hi, I'm trying to program a standalone Cyclone III FPGA (EP3C10E144C7) using the USB Blaster II cable in the JTAG mode. I load my FPGA into an adapter that breaks out the 144 pins of the FPGA into...
Ash_R_Altera's avatar
Ash_R_Altera
Icon for Regular Contributor rankRegular Contributor
5 years ago

Hi,


Please check the pad connections on the board. There is a possibility that due to weak soldering, the signal is not getting driven properly.


Regards.


Vasudev's avatar
Vasudev
Icon for New Contributor rankNew Contributor
5 years ago

Hi,

Thanks for the response. I checked the connection on the board. It seems to be fine. On applying 2.5V at the DIP header on the board, I get 2.5V inside the adapter (where the FPGA pin is connected).

I forgot to add this in my original question: The device package has an exposed pad at the bottom. I do not connect it to any pin. Does it absolutely need to be connected to GND or is it okay if I do not connect it?

Regards,

Vasudev