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Check nusers for M and P enable muxes

This commit is contained in:
Eddie Hung 2019-09-06 09:59:35 -07:00
parent 4fe24b20f9
commit 91f68c4de2
1 changed files with 17 additions and 2 deletions
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19
passes/pmgen/xilinx_dsp.pmg
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@ -134,10 +134,17 @@ endmatch
match ffMmux
select ffMmux->type.in($mux)
choice <IdString> BA {\B, \A}
// new-value net must have exactly two users: dsp and ffM
select nusers(port(ffMmux, BA)) == 2
define <IdString> AB (BA == \B ? \A : \B)
// keep-last-value net must have at least three users: ffMmux, ffM, downstream sink(s)
select nusers(port(ffMmux, AB)) >= 3
// ffMmux output must have two users: ffMmux and ffM.D
select nusers(port(ffMmux, \Y)) == 2
filter GetSize(port(ffMmux, \Y)) <= GetSize(sigM)
choice <IdString> BA {\B, \A}
filter port(ffMmux, BA) == sigM.extract(0, GetSize(port(ffMmux, \Y)))
// Remaining bits on sigM must not have any other users
filter nusers(sigM.extract_end(GetSize(port(ffMmux, BA)))) <= 1
define <bool> pol (BA == \B)
set ffMenpol pol
@ -157,6 +164,7 @@ match ffM
select nusers(port(ffM, \D)) == 2
filter GetSize(port(ffM, \D)) <= GetSize(sigM)
filter port(ffM, \D) == sigM.extract(0, GetSize(port(ffM, \D)))
// Remaining bits on sigM must not have any other users
filter nusers(sigM.extract_end(GetSize(port(ffM, \D)))) <= 1
// Check ffMmux (when present) is a $dff enable mux
filter !ffMmux || port(ffM, \Q) == port(ffMmux, ffMenpol ? \A : \B)
@ -221,10 +229,17 @@ endcode
match ffPmux
select ffPmux->type.in($mux)
choice <IdString> BA {\B, \A}
// new-value net must have exactly two users: dsp and ffP
select nusers(port(ffPmux, BA)) == 2
define <IdString> AB (BA == \B ? \A : \B)
// keep-last-value net must have at least three users: ffPmux, ffP, downstream sink(s)
select nusers(port(ffPmux, AB)) >= 3
// ffPmux output must have two users: ffPmux and ffP.D
select nusers(port(ffPmux, \Y)) == 2
filter GetSize(port(ffPmux, \Y)) <= GetSize(sigP)
choice <IdString> BA {\B, \A}
filter port(ffPmux, BA) == sigP.extract(0, GetSize(port(ffPmux, \Y)))
// Remaining bits on sigP must not have any other users
filter nusers(sigP.extract_end(GetSize(port(ffPmux, BA)))) <= 1
define <bool> pol (BA == \B)
set ffPenpol pol