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| gtw | I have a question about the behaviour of MemoryDffWorker::handle_rd_cell()... | 16:29 |
|---|---|---|
| gtw | The calls to find_sig_before_dff( sig_data, ..., true ) fail to match if the output bits are a strict subset of the memory bits. For instance, if there are any read ports reading only 7 bits of an 8-bit wide block RAM. | 16:31 |
| gtw | This small example: https://gist.github.com/garytwong/650f48f7b222623317f324a14925abde maps to block RAM as written, but if you change the "7" on line 5 to 6 or smaller (ignoring the MSB), then the MEMORY_DFF pass does nothing (saying "no (compatible) $dff found". | 16:33 |
| tpb | Title: Trivial block RAM module · GitHub (at gist.github.com) | 16:33 |
| mwk | I think there's an open issue for that already | 16:34 |
| gtw | Oh :) | 16:34 |
| gtw | Thanks, I'll try searching... | 16:34 |
| mwk | https://github.com/YosysHQ/yosys/issues/1854 | 16:34 |
| tpb | Title: memory_dff does not merge registers into read ports with unused bits · Issue #1854 · YosysHQ/yosys · GitHub (at github.com) | 16:34 |
| gtw | Haha perfect... I should have looked first! | 16:35 |
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