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Add support for DREG

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This commit is contained in:
Eddie Hung 2019-09-06 15:32:26 -07:00
parent ef56f8596f
commit 74eac76699
2 changed files with 70 additions and 2 deletions
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59
passes/pmgen/xilinx_dsp.pmg
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@ -1,9 +1,9 @@
pattern xilinx_dsp
state <SigBit> clock
state <SigSpec> sigA sigffAmuxY sigB sigffBmuxY sigC sigD sigM sigP
state <SigSpec> sigA sigffAmuxY sigB sigffBmuxY sigC sigD sigffDmuxY sigM sigP
state <IdString> postAddAB postAddMuxAB
state <bool> ffAenpol ffADenpol ffBenpol ffMenpol ffPenpol
state <bool> ffAenpol ffADenpol ffBenpol ffDenpol ffMenpol ffPenpol
state <int> ffPoffset
match dsp
@ -236,6 +236,61 @@ match ffBmux
optional
endmatch
match ffD
if param(dsp, \DREG).as_int() == 0
select ffD->type.in($dff)
// DSP48E1 does not support clock inversion
select param(ffD, \CLK_POLARITY).as_bool()
filter GetSize(port(ffD, \Q)) >= GetSize(sigD)
slice offset GetSize(port(ffD, \Q))
filter offset+GetSize(sigD) <= GetSize(port(ffD, \Q))
filter port(ffD, \Q).extract(offset, GetSize(sigD)) == sigD
optional
endmatch
code sigD sigffDmuxY clock
if (ffD) {
for (auto b : port(ffD, \Q))
if (b.wire->get_bool_attribute(\keep))
reject;
SigBit c = port(ffD, \CLK).as_bit();
if (clock != SigBit() && c != clock)
reject;
clock = c;
SigSpec D = sigD;
D.replace(port(ffD, \Q), port(ffD, \D));
// Only search for ffBmux if ffB.Q has at
// least 3 users (ffB, dsp, ffBmux) and
// its ffB.D only has two (ffB, ffBmux)
if (nusers(sigD) >= 3 && nusers(D) == 2)
sigffDmuxY = sigD;
sigD = std::move(D);
}
endcode
match ffDmux
if !sigffDmuxY.empty()
select ffDmux->type.in($mux)
index <SigSpec> port(ffDmux, \Y) === port(ffD, \D)
filter GetSize(port(ffDmux, \Y)) >= GetSize(sigD)
slice offset GetSize(port(ffDmux, \Y))
filter offset+GetSize(sigD) <= GetSize(port(ffDmux, \Y))
filter port(ffDmux, \Y).extract(offset, GetSize(sigB)) == sigD
choice <IdString> AB {\A, \B}
filter offset+GetSize(sigffDmuxY) <= GetSize(port(ffDmux, \Y))
filter port(ffDmux, AB).extract(offset, GetSize(sigffDmuxY)) == sigffDmuxY
define <bool> pol (AB == \A)
set ffDenpol pol
optional
endmatch
code sigD
if (ffDmux)
sigD.replace(port(ffDmux, \Y), port(ffDmux, ffDenpol ? \B : \A));
endcode
match ffMmux
if param(dsp, \MREG).as_int() == 0
if nusers(sigM) == 2