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Error from instantiating MMCME2_BASE primitive #153

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WhiteNinjaZ opened this issue Jun 14, 2021 · 6 comments
Open

Error from instantiating MMCME2_BASE primitive #153

WhiteNinjaZ opened this issue Jun 14, 2021 · 6 comments
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@mkurc-ant

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@WhiteNinjaZ
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I have been testing the symbiflow toolchain on a few designs and have run into an error while trying to run the pong design on project_f. When I try to run the design I get this error from the tool chain:
Message: Failed to find matching architecture model for 'MMCME2_BASE'
From what I can tell this is coming from file clock_gen_480p.sv trying to instance the MMCME primitive. Does symbiflow offer support for this yet?
@WhiteNinjaZ
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@acomodi @tmichalak?

@acomodi
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acomodi commented Jun 30, 2021

@WhiteNinjaZ At the moment there is a PR which is soon-to-be-merged and open to add support for the MMCM primitives in symbiflow-arch-defs. For context, symbiflow-arch-defs is the repository that generates the device data used to place&route.

Once that PR is merged and new device data generated by CI, we will be able to use MMCM primitives. In the meantime, unless strictly necessary, you might use PLLE2_BASE or PLLE2_ADV primitives instead.

@WhiteNinjaZ
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Thank you for the info.

@WhiteNinjaZ
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@acomodi Per chance do you know the time frame for when the MMCME2_BASE support in symbiflow-arch-defs will be done?

@mithro
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mithro commented Jul 19, 2021

@mkurc-ant

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@WhiteNinjaZ Hello. I can't tell about the time frame of doing that but adding MMCME2_BASE is a matter of writing a Yosys techmap in the same way as it is done for PLLE2_BASE. I'd prefer to do that after landing the MMCM PR but if you are lively interested in having the techmap there I can add it.

On the other hand merging f4pga/f4pga-arch-defs#1729 is more complicated as there is a CI failure not directly related to PLL/MMCM support which require further investigation.

@WhiteNinjaZ WhiteNinjaZ mentioned this issue Aug 9, 2021
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@mithro @acomodi @mkurc-ant @WhiteNinjaZ