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Docs: example_synth fifo update

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More detail on `memory_libmap`, the `$__ICE40_RAM4K_` intermediate step, and the
bizarre opt output.
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Krystine Sherwin 2024-01-30 13:34:29 +13:00
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docs/source/code_examples/fifo/fifo.libmap Normal file
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yosys> debug memory_libmap -lib +/ice40/brams.txt -lib +/ice40/spram.txt -no-auto-huge
yosys> memory_libmap -lib +/ice40/brams.txt -lib +/ice40/spram.txt -no-auto-huge
4. Executing MEMORY_LIBMAP pass (mapping memories to cells).
Memory fifo.data mapping candidates (post-geometry):
- logic fallback
- cost: 2048.000000
- $__ICE40_RAM4K_:
- option HAS_BE 0
- emulation score: 7
- replicates (for ports): 1
- replicates (for data): 1
- mux score: 0
- demux score: 0
- cost: 78.000000
- abits 11 dbits 2 4 8 16
- chosen base width 8
- swizzle 0 1 2 3 4 5 6 7
- emulate read-first behavior
- write port 0: port group W
- widths 2 4 8
- read port 0: port group R
- widths 2 4 8 16
- emulate transparency with write port 0
- $__ICE40_RAM4K_:
- option HAS_BE 1
- emulation score: 7
- replicates (for ports): 1
- replicates (for data): 1
- mux score: 0
- demux score: 0
- cost: 78.000000
- abits 11 dbits 2 4 8 16
- byte width 1
- chosen base width 8
- swizzle 0 1 2 3 4 5 6 7
- emulate read-first behavior
- write port 0: port group W
- widths 16
- read port 0: port group R
- widths 2 4 8 16
- emulate transparency with write port 0
Memory fifo.data mapping candidates (after post-geometry prune):
- logic fallback
- cost: 2048.000000
- $__ICE40_RAM4K_:
- option HAS_BE 0
- emulation score: 7
- replicates (for ports): 1
- replicates (for data): 1
- mux score: 0
- demux score: 0
- cost: 78.000000
- abits 11 dbits 2 4 8 16
- chosen base width 8
- swizzle 0 1 2 3 4 5 6 7
- emulate read-first behavior
- write port 0: port group W
- widths 2 4 8
- read port 0: port group R
- widths 2 4 8 16
- emulate transparency with write port 0
mapping memory fifo.data via $__ICE40_RAM4K_