Hi,
we developed a daughter board for the DE3 board's top connector and forgot to shorten TDI and TDO together. The daughter board itself does not use JTAG. As a result the FPGA cannot be programmed while the daughter board is plugged in. My question is how the DE3 decides if a daughter board is plugged in and when to bypass the connector? Is there a solution without unplugging the daughter board? JanLink Copied
Read the DE 3 User manual about DIP switches that configure the JTAG chain. There's a bypass switch for each HSTC connector.
That's only for the bottom connectors. We need a top connector. I think the only solution is to connect the pins with a wire.
Yes, I didn't notice, that the bypass switch is valid for the bottom connector only.
Anyone got a solution for this? I have the same issue right now.
short answer: unplug the daughter board when you want to use JTAG. otherwise TDI and TDO _must_ be connected on the daughter board.
I can't really unplug, since i need to use signaltap with the daughterboard in use. I used to do that but its simply not an option any longer.
Wierd thing is that im using alteras own daughterboard "Dual Highspeed AD DA" board, and I simply can't find any way to connect it! The only option i've found so far is getting hold of the SFF connector to disable JTAG (see attatched pic).For more complete information about compiler optimizations, see our Optimization Notice.