08-06-2017 08:55 AM
a few werk ago i bought a spartan 3e dev Board from waveshare with Xilinx ISE12.2.
Since then i realized a few Projects (only in Software Not send the stream to
the Board). But for the newest project i am trying to connect 7 latches with an adder through a Common Bus.
And i get a few error msgs saying: Too Many Outputs connected to One Input.
So i tried tri-state buffers. Nothing works. I Can Provide .sch-file and error-file (edited) if needed.
08-06-2017 10:24 AM
08-06-2017 11:32 AM
Now this is much clearer ...
ERROR:Xst:528 - Multi-source in Unit <CPU_2> on signal <XLXN_19<7>>; this signal is connected to multiple drivers.
Tells you that you are trying to drivea signal with more than one input.
I.e. you are basically creating a short circuit of several outputs on a single wire (which is not a good idea :).
You need/want to combine those different outputs in some way, for example through a gate (AND, OR, etc).
Hope that helps,
08-06-2017 10:20 PM
i'm sorry, but this doesn't help me in any way. For that reason Tri-State buffers were invented. But if this is the way those problems are solved in fpga designs, i'm happy with that. Thanks a lot.