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Platform function to calculate optimal BRAM depth for width #173

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whitequark opened this issue Aug 18, 2019 · 1 comment
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Platform function to calculate optimal BRAM depth for width #173

whitequark opened this issue Aug 18, 2019 · 1 comment
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feature platform:all

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@whitequark
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This is useful in case the target has BRAMs with variable aspect ratio (most of them do, if not all), and some platform independent gateware that has flexible BRAM requirements, e.g. a crossbar with a FIFO, wants to know the BRAM depth it should specify to avoid having any unused BRAM left over.
@whitequark whitequark modified the milestone: 0.1 Sep 18, 2019
@whitequark
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It does not appear to be possible to calculate optimal BRAM depth for e.g. Xilinx Series 7 because it depends on the port configuration. Therefore I think nMigen should not provide this functionality, at least until someone comes up with a robust semantics that would fit most applications.

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