Does Recursive Design Causes the Error: "More than 100% of Device resources are used"?

[mericisgenc]

Hello everyone,

I have always used RTL design method until now; however currently I need to make use of recursion since the "network" that I am trying to implement is a bit complicated.

Anyways,  I handled most of the problems, and simulation seems to be working fine. Despite some bit assignment warnings in the synthesis, I get the warning message "More than 100% of Device resources are used" and ofc the synthesis stops.

I attached my code below. It would be real great if anyone could help me.

By the way I am using Virtex 5 XC5VLX50 and package FF324. And I have Xilinx ISE Webpack.

[awillen]

Well, which of the resources are over-used? I would guess the IO pins, in which case: Don't worry, this would go away in a complete design.

Also, don't do this:

module A(x);

input x;

Instead, do this:

module A(input x);

[mericisgenc]

Well, at the error message I am not given info on which specific part of the devic is tried to be overused. The message is exactly like that:

 "(*) More than 100% of Device resources are used"

and I guess I cannot view the rest of the possible synthesis errors/warnings since I get this warning, because the synthesis tool instantly stops.

This could be a serious problem or is it certain that I can remove it when I add different modules?

Thanks a lot for the reply by the way.

[awillen]

Please post the complete synthesis report. If that is not possible, post the synthesis log.

[mericisgenc]

Hello awillen,

Thanks a lot for your help. I attached the synthesis report. I assume by checking the report IOB's are exceeded and I assume this problem will vanish when different blocks are instantiated. But anyways, I would like to hear your advice/comment.

[awillen · Accepted solution]

1. The synthesis didn't "instantly stop", it successfully completed its task and did not even find any errors.
2. In each line of the device utilization summary, a "*" on the right indicates that this resource is over-utilized.

[mericisgenc]

Thank you so much!