Xilinx rtl schematic not updating david wygant secrets of online dating

You mention a latch in your question, be sure you actually want it in your design, because it can be a source of problems which you won't see in a logic simulation.

About the questions: And of course, the schematics can be useful to find problems in the design.

I am learning digital logic design with FPGA's, and I am using the Xilinx Spartan6 FPGA.

I am able to successfully able to simulate my design correctly, but the design does not work properly, when I download it on my FPGA.

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Don't know about the specifics of your tool, but perhaps theres a way you can add keep nets to key signals in your design and see if they are behaving properly. Xilinx FPGAs have a global set/reset (GSR) signal that puts all registers in the their default state or as specified in the register declaration (this is documented in the XST User's Guide at the beginning of chapter 5). However, things are chaotic when the FPGA starts up, because: So the initial Flip-Flop values after the GSR are not enough.

I don't know what went wrong as there were no warnings during simulation. Is there any way to debug post synthesis level netlist? @Tim, it's not same as the one I got in behavioral simulation.Functions works, at this stage maybe 2% of the available resources have been used. The only genuine wrong-hardware bug I have seen in XST has to do with signals passed as OUT parameters to procedures within a process...Are there any secret flags or peculiarities anyone knows of? the signals were assigned using variable assignment (immediate assignment) semantics!Interestingly when I design a test bench around the functions the results are correct.When I simulate my design in the project using a combination of generates and functions the hardware is wired correctly.

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Also I don't know if this is a 50 gate or 500,000 gate synthesis, but if your project is small perhaps you can add the source and someone can look for obvious problems like latches or possibly x-prop [email protected], the netlist is in terms of FPGA primitives. Moreover, I don't think there are issues likes latches because XST shows warnings for such problems. You can create it by by AND'ing relevant asynchronous reset signals, such as an external reset pin, PLL/DCM locked signals, and using it with a synchronizer, as follows: (Source: How do I reset my FPGA?

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