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Merge pull request #1603 from whitequark/ice40-ram_style

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ice40/ecp5: add support for both 1364.1 and Synplify/LSE RAM/ROM attributes
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whitequark 2020-04-10 14:51:01 +00:00 • committed by GitHub
commit 93ef516d91
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12 changed files with 837 additions and 51 deletions
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62
techlibs/ice40/brams.txt
View file

@ -28,13 +28,73 @@ bram $__ICE40_RAM4K_M123
clkpol 2 3
endbram
# The syn_* attributes are described in:
# https://www.latticesemi.com/-/media/LatticeSemi/Documents/Tutorials/AK/LatticeDiamondTutorial311.ashx
attr_icase 1
match $__ICE40_RAM4K_M0
# implicitly requested RAM or ROM
attribute !syn_ramstyle syn_ramstyle=auto
attribute !syn_romstyle syn_romstyle=auto
attribute !ram_block
attribute !rom_block
attribute !logic_block
min efficiency 2
make_transp
or_next_if_better
endmatch
match $__ICE40_RAM4K_M0
# explicitly requested RAM
attribute syn_ramstyle=block_ram ram_block
attribute !syn_romstyle
attribute !rom_block
attribute !logic_block
min wports 1
make_transp
or_next_if_better
endmatch
match $__ICE40_RAM4K_M0
# explicitly requested ROM
attribute syn_romstyle=ebr rom_block
attribute !syn_ramstyle
attribute !ram_block
attribute !logic_block
max wports 0
make_transp
or_next_if_better
endmatch
match $__ICE40_RAM4K_M123
# implicitly requested RAM or ROM
attribute !syn_ramstyle syn_ramstyle=auto
attribute !syn_romstyle syn_romstyle=auto
attribute !ram_block
attribute !rom_block
attribute !logic_block
min efficiency 2
make_transp
or_next_if_better
endmatch
match $__ICE40_RAM4K_M123
min efficiency 2
# explicitly requested RAM
attribute syn_ramstyle=block_ram ram_block
attribute !syn_romstyle
attribute !rom_block
attribute !logic_block
min wports 1
make_transp
or_next_if_better
endmatch
match $__ICE40_RAM4K_M123
# explicitly requested ROM
attribute syn_romstyle=ebr rom_block
attribute !syn_ramstyle
attribute !ram_block
attribute !logic_block
max wports 0
make_transp
endmatch

4
techlibs/ice40/synth_ice40.cc
View file

@ -319,7 +319,9 @@ struct SynthIce40Pass : public ScriptPass
if (check_label("map_ffram"))
{
run("opt -fast -mux_undef -undriven -fine");
run("memory_map");
run("memory_map -iattr -attr !ram_block -attr !rom_block -attr logic_block "
"-attr syn_ramstyle=auto -attr syn_ramstyle=registers "
"-attr syn_romstyle=auto -attr syn_romstyle=logic");
run("opt -undriven -fine");
}