Honored Contributor
Honored ContributorI'm having the same problem with a EP3C5E 144 pin package. No detection of JTAG. Its wired up the same way, only MSEL1 is pulled high to 3.3 volts which I think should be ok.
Our circuit board guy forgot to put the ground pad under the chip, so I'm thinking that's the problem with our board. The Altera documentation states: "The E144 pin package has an exposed ground pad at the bottom of the package. This ground pad is used for electrical connectivity . You must connect the ground pad to the ground plane of the PCB". However, when I poke a wire thru a over that ground pad it seems it is connected to ground already. Maybe thru other ground pins? In any case, I'm not sure if that is the problem with our board or not. We have a 30 dollar Chinese eval board that we got here: http://www.wvshare.com/product/coreep3c5.htm and have pretty much copied the connections on our prototype. The eval board connects and works great, so I know our programmer and quartus works fine. They have grounded that ground pad, but I'm not sure that is the problem or not. I guess I will keep looking for why our board wont communicate, the only thing I can come up with is that ground pad though.
