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Use -match-init to not synth contradicting init values

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This commit is contained in:
Pepijn de Vos 2019-12-03 15:12:25 +01:00
parent 72d03dc910
commit a3b25b4af8
2 changed files with 13 additions and 11 deletions
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2
techlibs/gowin/synth_gowin.cc
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@ -216,7 +216,7 @@ struct SynthGowinPass : public ScriptPass
if (check_label("map_ffs")) if (check_label("map_ffs"))
{ {
run("dffsr2dff"); run("dffsr2dff");
run("dff2dffs"); run("dff2dffs -match-init");
run("opt_clean"); run("opt_clean");
if (!nodffe) if (!nodffe)
run("dff2dffe -direct-match $_DFF_* -direct-match $__DFFS_*"); run("dff2dffe -direct-match $_DFF_* -direct-match $__DFFS_*");

22
tests/arch/gowin/init.ys
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@ -36,7 +36,8 @@ design -load read
# these should synth to a flop with reset # these should synth to a flop with reset
chparam -set INIT 1 myDFF myDFFN myDFFE myDFFNE chparam -set INIT 1 myDFF myDFFN myDFFE myDFFNE
# these should give a warning # async should give a warning
# sync should synth to a mux
chparam -set INIT 0 myDFF*S* myDFF*P* chparam -set INIT 0 myDFF*S* myDFF*P*
chparam -set INIT 1 myDFF*R* myDFF*C* chparam -set INIT 1 myDFF*R* myDFF*C*
@ -45,28 +46,29 @@ flatten
synth_gowin -run coarse: synth_gowin -run coarse:
# check the flops mapped as expected # check the flops mapped as expected
select -assert-count 0 t:DFF select -assert-count 1 t:DFF
select -assert-count 1 t:DFFC select -assert-count 1 t:DFFC
select -assert-count 1 t:DFFCE select -assert-count 1 t:DFFCE
select -assert-count 0 t:DFFE select -assert-count 1 t:DFFE
select -assert-count 0 t:DFFN select -assert-count 1 t:DFFN
select -assert-count 1 t:DFFNC select -assert-count 1 t:DFFNC
select -assert-count 1 t:DFFNCE select -assert-count 1 t:DFFNCE
select -assert-count 0 t:DFFNE select -assert-count 1 t:DFFNE
select -assert-count 1 t:DFFNP select -assert-count 1 t:DFFNP
select -assert-count 1 t:DFFNPE select -assert-count 1 t:DFFNPE
select -assert-count 1 t:DFFNR select -assert-count 0 t:DFFNR
select -assert-count 1 t:DFFNRE select -assert-count 0 t:DFFNRE
select -assert-count 2 t:DFFNS select -assert-count 2 t:DFFNS
select -assert-count 2 t:DFFNSE select -assert-count 2 t:DFFNSE
select -assert-count 1 t:DFFP select -assert-count 1 t:DFFP
select -assert-count 1 t:DFFPE select -assert-count 1 t:DFFPE
select -assert-count 1 t:DFFR select -assert-count 0 t:DFFR
select -assert-count 1 t:DFFRE select -assert-count 0 t:DFFRE
select -assert-count 2 t:DFFS select -assert-count 2 t:DFFS
select -assert-count 2 t:DFFSE select -assert-count 2 t:DFFSE
select -assert-count 12 t:LUT2
# check the expected leftover init values # check the expected leftover init values
# this would happen if your reset value is not the initial value # this would happen if your reset value is not the initial value
# which would be weird # which would be weird
select -assert-count 16 a:init select -assert-count 8 a:init