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dj-park's avatar
dj-park
Icon for Occasional Contributor rankOccasional Contributor
3 years ago

Place region and Route region of Quartus Partial Reconfiguration

I've noticed that there are "Place region" and "Route region" in Quartus Partial Reconfiguration(PR). I have three related questions. 1) Is the PR persona's routing fully encapsulated in the Rou...
RichardT_altera's avatar
RichardT_altera
Icon for Super Contributor rankSuper Contributor
3 years ago

Though it is similar to the reserved placement region, the RESERVED_ROUTE_REGION assignment reserves all the routing within the logic lock region(LLR) for paths assigned to that LLR. While RESERVED_PLACE_REGION reserves all the placement assigned to that LLR.


A little bit of background history, this feature does not work as expected and was drop in 2018. Then it was brought back in 2019 as there a couple of use cases, though niche, that can benefit from it. Like static region crosstalk problems. There is side effect as you can see in the warning message pop up when you check the box. So use only if strictly necessary.


All in all, I will avoid using that.


Best Regards,

Richard Tan


dj-park's avatar
dj-park
Icon for Occasional Contributor rankOccasional Contributor
3 years ago

Thanks. Your answer is in fact consistent with my guess above.
I think RESERVED_ROUTE_REGION reserves routing and placement logic in the PR region.

Interesting history! Can you elaborate on "static region crosstalk problem?"
Do you mean that if too much static routing goes over the PR region, there exists less routing resource left for the PR region?