riscv
/
yosys
mirror of https://github.com/YosysHQ/yosys.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
yosys/techlibs/ice40/brams.txt

100 lines
1.9 KiB
Plaintext
Raw Normal View History

Added ice40 bram support
2015-04-23 17:06:50 -05:00
bram $__ICE40_RAM4K_M0
initialized iCE40 brams (mode 0)
2015-04-25 13:44:51 -05:00
init 1
Added ice40 bram support
2015-04-23 17:06:50 -05:00
abits 8
dbits 16
groups 2
ports 1 1
wrmode 0 1
Added read-enable to memory model
2015-09-25 05:23:11 -05:00
enable 1 16
Added ice40 bram support
2015-04-23 17:06:50 -05:00
transp 0 0
clocks 2 3
clkpol 2 3
endbram
bram $__ICE40_RAM4K_M123
Initialization support for all iCE40 bram modes
2015-04-26 01:39:31 -05:00
init 1
Added ice40 bram support
2015-04-23 17:06:50 -05:00
abits 9 @M1
dbits 8 @M1
abits 10 @M2
dbits 4 @M2
abits 11 @M3
dbits 2 @M3
groups 2
ports 1 1
wrmode 0 1
Added read-enable to memory model
2015-09-25 05:23:11 -05:00
enable 1 1
Added ice40 bram support
2015-04-23 17:06:50 -05:00
transp 0 0
clocks 2 3
clkpol 2 3
endbram
ice40: add support for both 1364.1 and LSE RAM/ROM attributes. This commit tries to carefully follow the documented behavior of LSE and Synplify. It will use `syn_ramstyle` attribute if there are any write ports, and `syn_romstyle` attribute otherwise. * LSE supports both `syn_ramstyle` and `syn_romstyle`. * Synplify only supports `syn_ramstyle`, with same values as LSE. * Synplify also supports `syn_rw_conflict_logic`, which is not documented as supported for LSE. Limitations of the Yosys implementation: * LSE/Synplify appear to interpret attribute values insensitive to case. There is currently no way to do this in Yosys (attrmap can only change case of attribute names). * LSE/Synplify support `syn_ramstyle="block_ram,no_rw_check"` syntax to turn off insertion of transparency logic. There is currently no way to support multiple valued attributes in memory_bram. It is also not clear if that is a good idea, since it can cause sim/synth mismatches. * LSE/Synplify/1364.1 support block ROM inference from full case statements. Yosys does not currently perform this transformation. * LSE/Synplify propagate `syn_ramstyle`/`syn_romstyle` attributes from the module to the inner memories. There is currently no way to do this in Yosys (attrmvcp only works on cells and wires).
2020-01-01 00:18:53 -06:00
# The syn_* attributes are described in:
# https://www.latticesemi.com/-/media/LatticeSemi/Documents/Tutorials/AK/LatticeDiamondTutorial311.ashx
Added ice40 bram support
2015-04-23 17:06:50 -05:00
match $__ICE40_RAM4K_M0
ice40: add support for both 1364.1 and LSE RAM/ROM attributes. This commit tries to carefully follow the documented behavior of LSE and Synplify. It will use `syn_ramstyle` attribute if there are any write ports, and `syn_romstyle` attribute otherwise. * LSE supports both `syn_ramstyle` and `syn_romstyle`. * Synplify only supports `syn_ramstyle`, with same values as LSE. * Synplify also supports `syn_rw_conflict_logic`, which is not documented as supported for LSE. Limitations of the Yosys implementation: * LSE/Synplify appear to interpret attribute values insensitive to case. There is currently no way to do this in Yosys (attrmap can only change case of attribute names). * LSE/Synplify support `syn_ramstyle="block_ram,no_rw_check"` syntax to turn off insertion of transparency logic. There is currently no way to support multiple valued attributes in memory_bram. It is also not clear if that is a good idea, since it can cause sim/synth mismatches. * LSE/Synplify/1364.1 support block ROM inference from full case statements. Yosys does not currently perform this transformation. * LSE/Synplify propagate `syn_ramstyle`/`syn_romstyle` attributes from the module to the inner memories. There is currently no way to do this in Yosys (attrmvcp only works on cells and wires).
2020-01-01 00:18:53 -06:00
# 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
iCE40: set min bram efficiency to 2%
2015-06-20 02:31:19 -05:00
min efficiency 2
Added ice40 bram support
2015-04-23 17:06:50 -05:00
make_transp
or_next_if_better
endmatch
ice40: add support for both 1364.1 and LSE RAM/ROM attributes. This commit tries to carefully follow the documented behavior of LSE and Synplify. It will use `syn_ramstyle` attribute if there are any write ports, and `syn_romstyle` attribute otherwise. * LSE supports both `syn_ramstyle` and `syn_romstyle`. * Synplify only supports `syn_ramstyle`, with same values as LSE. * Synplify also supports `syn_rw_conflict_logic`, which is not documented as supported for LSE. Limitations of the Yosys implementation: * LSE/Synplify appear to interpret attribute values insensitive to case. There is currently no way to do this in Yosys (attrmap can only change case of attribute names). * LSE/Synplify support `syn_ramstyle="block_ram,no_rw_check"` syntax to turn off insertion of transparency logic. There is currently no way to support multiple valued attributes in memory_bram. It is also not clear if that is a good idea, since it can cause sim/synth mismatches. * LSE/Synplify/1364.1 support block ROM inference from full case statements. Yosys does not currently perform this transformation. * LSE/Synplify propagate `syn_ramstyle`/`syn_romstyle` attributes from the module to the inner memories. There is currently no way to do this in Yosys (attrmvcp only works on cells and wires).
2020-01-01 00:18:53 -06:00
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
Added ice40 bram support
2015-04-23 17:06:50 -05:00
match $__ICE40_RAM4K_M123
ice40: add support for both 1364.1 and LSE RAM/ROM attributes. This commit tries to carefully follow the documented behavior of LSE and Synplify. It will use `syn_ramstyle` attribute if there are any write ports, and `syn_romstyle` attribute otherwise. * LSE supports both `syn_ramstyle` and `syn_romstyle`. * Synplify only supports `syn_ramstyle`, with same values as LSE. * Synplify also supports `syn_rw_conflict_logic`, which is not documented as supported for LSE. Limitations of the Yosys implementation: * LSE/Synplify appear to interpret attribute values insensitive to case. There is currently no way to do this in Yosys (attrmap can only change case of attribute names). * LSE/Synplify support `syn_ramstyle="block_ram,no_rw_check"` syntax to turn off insertion of transparency logic. There is currently no way to support multiple valued attributes in memory_bram. It is also not clear if that is a good idea, since it can cause sim/synth mismatches. * LSE/Synplify/1364.1 support block ROM inference from full case statements. Yosys does not currently perform this transformation. * LSE/Synplify propagate `syn_ramstyle`/`syn_romstyle` attributes from the module to the inner memories. There is currently no way to do this in Yosys (attrmvcp only works on cells and wires).
2020-01-01 00:18:53 -06:00
# 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
iCE40: set min bram efficiency to 2%
2015-06-20 02:31:19 -05:00
min efficiency 2
Added ice40 bram support
2015-04-23 17:06:50 -05:00
make_transp
ice40: add support for both 1364.1 and LSE RAM/ROM attributes. This commit tries to carefully follow the documented behavior of LSE and Synplify. It will use `syn_ramstyle` attribute if there are any write ports, and `syn_romstyle` attribute otherwise. * LSE supports both `syn_ramstyle` and `syn_romstyle`. * Synplify only supports `syn_ramstyle`, with same values as LSE. * Synplify also supports `syn_rw_conflict_logic`, which is not documented as supported for LSE. Limitations of the Yosys implementation: * LSE/Synplify appear to interpret attribute values insensitive to case. There is currently no way to do this in Yosys (attrmap can only change case of attribute names). * LSE/Synplify support `syn_ramstyle="block_ram,no_rw_check"` syntax to turn off insertion of transparency logic. There is currently no way to support multiple valued attributes in memory_bram. It is also not clear if that is a good idea, since it can cause sim/synth mismatches. * LSE/Synplify/1364.1 support block ROM inference from full case statements. Yosys does not currently perform this transformation. * LSE/Synplify propagate `syn_ramstyle`/`syn_romstyle` attributes from the module to the inner memories. There is currently no way to do this in Yosys (attrmvcp only works on cells and wires).
2020-01-01 00:18:53 -06:00
or_next_if_better
endmatch
match $__ICE40_RAM4K_M123
# 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
Added ice40 bram support
2015-04-23 17:06:50 -05:00
endmatch