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yosys/techlibs/ecp5/lutrams.txt

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ecp5: Adding DRAM map Signed-off-by: David Shah <davey1576@gmail.com>
2018-07-13 07:08:42 -05:00
bram $__TRELLIS_DPR16X4
init 1
abits 4
dbits 4
groups 2
ports 1 1
wrmode 0 1
enable 0 1
transp 0 0
clocks 0 1
clkpol 0 2
endbram
ecp5: Add DRAM match rule Signed-off-by: David Shah <davey1576@gmail.com>
2018-07-13 09:25:52 -05:00
ecp5: 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 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 02:27:47 -06:00
# The syn_* attributes are described in:
[ECP5] fix wrong link for syn_* attributes description (#2984)
2021-08-29 04:45:23 -05:00
# https://www.latticesemi.com/view_document?document_id=51556
ecp5: 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 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 02:27:47 -06:00
attr_icase 1
ecp5: Add DRAM match rule Signed-off-by: David Shah <davey1576@gmail.com>
2018-07-13 09:25:52 -05:00
match $__TRELLIS_DPR16X4
ecp5: 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 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 02:27:47 -06:00
attribute !syn_ramstyle syn_ramstyle=auto syn_ramstyle=distributed
attribute !syn_romstyle syn_romstyle=auto
attribute !ram_block
attribute !rom_block
attribute !logic_block
ecp5: Add DRAM match rule Signed-off-by: David Shah <davey1576@gmail.com>
2018-07-13 09:25:52 -05:00
make_outreg
ecp5: Don't map ROMs to DRAM Signed-off-by: David Shah <davey1576@gmail.com>
2018-10-01 12:34:41 -05:00
min wports 1
ecp5: Add DRAM match rule Signed-off-by: David Shah <davey1576@gmail.com>
2018-07-13 09:25:52 -05:00
endmatch