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Kestrel Collaboration
Kestrel LiteX
migen
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ccc12d3c
Commit
ccc12d3c
authored
7 years ago
by
William D. Jones
Committed by
Sébastien Bourdeauducq
7 years ago
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lattice/icestorm: Clarify supported/unsupported attributes.
parent
87bba69a
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migen/build/lattice/icestorm.py
migen/build/lattice/icestorm.py
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migen/build/lattice/icestorm.py
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ccc12d3c
...
...
@@ -87,17 +87,20 @@ icepack {icepack_opt} {build_name}.txt {build_name}.bin{fail_stmt}
class
LatticeIceStormToolchain
:
attr_translate
=
{
"keep"
:
(
"keep"
,
"true"
),
"no_retiming"
:
None
,
# yosys does not do retiming
"async_reg"
:
None
,
# The next 5 attributes are Vivado-specific. Ignore.
"mr_ff"
:
None
,
"no_retiming"
:
None
,
# yosys/arachne-pnr does not do retiming.
"async_reg"
:
None
,
# yosys has no equivalent, and arachne-pnr
# wouldn't take advantage of it anyway.
# While custom constraints are supported in yosys, neither
# arachne-pnr nor icetime currently can take advantage of them
# to add fine-grained timing constraints.
"mr_ff"
:
None
,
# user-defined attribute
"mr_false_path"
:
None
,
# user-defined attribute
"ars_ff1"
:
None
,
# user-defined attribute
"ars_ff2"
:
None
,
# user-defined attribute
"ars_false_path"
:
None
,
# user-defined attribute
#
S
hift reg primitive
issues are ISE-specific. Ignore
.
#
ice40 does not have a s
hift reg
ister
primitive.
"no_shreg_extract"
:
None
}
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