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hcom's avatar
hcom
Icon for Occasional Contributor rankOccasional Contributor
3 years ago
Solved

Arria 10 (speed grade 3) has worse timing performance than Cyclone 10 GX (speed grade 5)

I am porting a design from a 10CX085YF67215G (Cyclone 10 GX, speed grade 5) to a 10AX022C4U19E3LG (Arria 10, speed grade 3). I am using Quartus Prime Pro Edition 21.3. The design meets timing in th...
  • hcom's avatar
    hcom
    3 years ago

    As confirmed by @RichardTanSY_Altera , this is expected behavior. Although it is totally baffling that a more expensive device family, combined with a superior speed grade leads to worse timing performance, I am satisfied that my question has been answered.

RichardT_altera's avatar
RichardT_altera
Icon for Super Contributor rankSuper Contributor
3 years ago

As mentioned in the user guide, it seems that it is expected when you find the A10 with speed grade 3 is worse than C10 speed grade 5.

Btw, is the timing failed at all corner?

Do you mind to share us the design for further investigate?

  • hcom's avatar
    hcom
    Icon for Occasional Contributor rankOccasional Contributor
    3 years ago

    @RichardTanSY_Altera If this is expected behavior, then there would be no sense in addressing your two questions. Wouldn't it just be a waste of time?

    Also, my past experience with Intel employees on this forum is that they ask me to provide a project, I spend hours removing sensitive information and uploading the project, then they never bother to look at it. You can easily create your own project. It doesn't seem to matter what is in the project - timing behavior is significantly worse in the more expensive device.