retime failed with error msg "Failed on find_unique_design"

Hi Sporadic Crash,

I suggest checking your directories after elaboration. Sounds like you elaborated more than one design. Also, if I am not mistaken, you do not need to do
> set_attr retime true [find / -subdesign *]
My understanding is that
> set_attr retime true [find / -design ]
is sufficient since the attribute is recursive. I only use subdesign when I specifically only want to retime a particular subdesign/s and nothing else.

good luck,
gh-

Hi grasshopper,

The flow is stable and we are pretty confident that only and only one elab occurs.

That I want to retime a particular subdesign, is correct. Due to my typo, [find / -subdesign *] was stated above. No, I have used the name of the particular subdesign.

I have tried different combinations but RTL Compiler does not like the retime attributes I set. It always gives me the same error.
I have set the attrib, run generic synthesis -to_generic. No, I get that error.
I havfe run generic synthesis -to_generic, I have set the attrib. The same error.
I have set the attrib right after elab. Then directly synthesize -to_mapped. The same error.
I am pretty sure that only one subdesign was set for the retime attrib for all tries above.

The error refers to an internal TCL command/procedure intransparent to the user. I thus dont know what the error is.

Hi Sporadic Crash,

somehow it seems like there is a non-unique design RC expects to be unique. Have to tried uniquifying and then applying to the instance you are interested instead of the subdesign. You can try
> set retimeDesign [edit_netlist dedicate_subdesign [find / -inst and then follow your flow using $retimeDesign. Otherwise sounds like you may need to get the local Cadence folks to help you out. Hope they are the good kind :)

good luck,
gh-

Hi Grasshopper,

I have found the reason why. If the compiler script checks out the special license required for retiming, RTL Compiler generates some internal designs right after generic synthesis. This gives more than one design (find / -design *) and the tool cannot run the scripts any more.

The checked-out license changes the behavior of the tool. Cadence has been contacted, this is a tool issue.. The tool behaves beyond the scope of the user script, which is not acceptable.

Hi, just forgot to mention is that the RTL Compiler generates these strange designs even if the retiming feature is NOT enabled.

There are actually more things here but due to marketing/company reasons I will not tell more infomation in this subject.

Thanks for the update for the rest of us watching the forum Sporadic Crash. Do not worry about the details. If your company is as security happy as mine, I certainly empathize . . .
I will definitely watch out for it but hopefully they will remedy soon from your comments.

take care,
gh-

Hi Grasshopper,

we have found out that the additional designs, which I called "redundant designs" are actually a result of superthreading function which was enabled with the special license. But because of some network issues in-house, RTL Compiler stops.

This seems to be our issue, not the tool.
Thus this thread might be closed...