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Add $aldff and $aldffe: flip-flops with async load.

This commit is contained in:
Marcelina Kościelnicka 2021-10-01 04:33:00 +02:00
parent fbd70f28f0
commit ec2b5548fe
9 changed files with 527 additions and 2 deletions
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2
CHANGELOG
View File

@ -5,6 +5,8 @@ List of major changes and improvements between releases
Yosys 0.10 .. Yosys 0.10-dev
--------------------------
* Various
- Added $aldff and $aldffe (flip-flops with async load) cells
Yosys 0.9 .. Yosys 0.10
--------------------------

11
kernel/celltypes.h
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@ -142,6 +142,8 @@ struct CellTypes
setup_type(ID($dffsre), {ID::CLK, ID::SET, ID::CLR, ID::D, ID::EN}, {ID::Q});
setup_type(ID($adff), {ID::CLK, ID::ARST, ID::D}, {ID::Q});
setup_type(ID($adffe), {ID::CLK, ID::ARST, ID::D, ID::EN}, {ID::Q});
setup_type(ID($aldff), {ID::CLK, ID::ALOAD, ID::AD, ID::D}, {ID::Q});
setup_type(ID($aldffe), {ID::CLK, ID::ALOAD, ID::AD, ID::D, ID::EN}, {ID::Q});
setup_type(ID($sdff), {ID::CLK, ID::SRST, ID::D}, {ID::Q});
setup_type(ID($sdffe), {ID::CLK, ID::SRST, ID::D, ID::EN}, {ID::Q});
setup_type(ID($sdffce), {ID::CLK, ID::SRST, ID::D, ID::EN}, {ID::Q});
@ -224,6 +226,15 @@ struct CellTypes
for (auto c4 : list_np)
setup_type(stringf("$_DFFE_%c%c%c%c_", c1, c2, c3, c4), {ID::C, ID::R, ID::D, ID::E}, {ID::Q});
for (auto c1 : list_np)
for (auto c2 : list_np)
setup_type(stringf("$_ALDFF_%c%c_", c1, c2), {ID::C, ID::L, ID::AD, ID::D}, {ID::Q});
for (auto c1 : list_np)
for (auto c2 : list_np)
for (auto c3 : list_np)
setup_type(stringf("$_ALDFFE_%c%c%c_", c1, c2, c3), {ID::C, ID::L, ID::AD, ID::D, ID::E}, {ID::Q});
for (auto c1 : list_np)
for (auto c2 : list_np)
for (auto c3 : list_np)

3
kernel/constids.inc
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@ -11,9 +11,12 @@ X(abc9_mergeability)
X(abc9_scc_id)
X(abcgroup)
X(ABITS)
X(AD)
X(ADDR)
X(allconst)
X(allseq)
X(ALOAD)
X(ALOAD_POLARITY)
X(always_comb)
X(always_ff)
X(always_latch)

110
kernel/rtlil.cc
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@ -58,6 +58,8 @@ const pool<IdString> &RTLIL::builtin_ff_cell_types() {
ID($dffsre),
ID($adff),
ID($adffe),
ID($aldff),
ID($aldffe),
ID($sdff),
ID($sdffe),
ID($sdffce),
@ -118,6 +120,18 @@ const pool<IdString> &RTLIL::builtin_ff_cell_types() {
ID($_DFFE_PP0P_),
ID($_DFFE_PP1N_),
ID($_DFFE_PP1P_),
ID($_ALDFF_NN_),
ID($_ALDFF_NP_),
ID($_ALDFF_PN_),
ID($_ALDFF_PP_),
ID($_ALDFFE_NNN_),
ID($_ALDFFE_NNP_),
ID($_ALDFFE_NPN_),
ID($_ALDFFE_NPP_),
ID($_ALDFFE_PNN_),
ID($_ALDFFE_PNP_),
ID($_ALDFFE_PPN_),
ID($_ALDFFE_PPP_),
ID($_SDFF_NN0_),
ID($_SDFF_NN1_),
ID($_SDFF_NP0_),
@ -1337,6 +1351,32 @@ namespace {
return;
}
if (cell->type == ID($aldff)) {
param_bool(ID::CLK_POLARITY);
param_bool(ID::ALOAD_POLARITY);
port(ID::CLK, 1);
port(ID::ALOAD, 1);
port(ID::D, param(ID::WIDTH));
port(ID::AD, param(ID::WIDTH));
port(ID::Q, param(ID::WIDTH));
check_expected();
return;
}
if (cell->type == ID($aldffe)) {
param_bool(ID::CLK_POLARITY);
param_bool(ID::EN_POLARITY);
param_bool(ID::ALOAD_POLARITY);
port(ID::CLK, 1);
port(ID::EN, 1);
port(ID::ALOAD, 1);
port(ID::D, param(ID::WIDTH));
port(ID::AD, param(ID::WIDTH));
port(ID::Q, param(ID::WIDTH));
check_expected();
return;
}
if (cell->type == ID($dlatch)) {
param_bool(ID::EN_POLARITY);
port(ID::EN, 1);
@ -1648,6 +1688,15 @@ namespace {
ID($_DFFE_PP0N_), ID($_DFFE_PP0P_), ID($_DFFE_PP1N_), ID($_DFFE_PP1P_)))
{ port(ID::D,1); port(ID::Q,1); port(ID::C,1); port(ID::R,1); port(ID::E,1); check_expected(); return; }
if (cell->type.in(
ID($_ALDFF_NN_), ID($_ALDFF_NP_), ID($_ALDFF_PN_), ID($_ALDFF_PP_)))
{ port(ID::D,1); port(ID::Q,1); port(ID::C,1); port(ID::L,1); port(ID::AD,1); check_expected(); return; }
if (cell->type.in(
ID($_ALDFFE_NNN_), ID($_ALDFFE_NNP_), ID($_ALDFFE_NPN_), ID($_ALDFFE_NPP_),
ID($_ALDFFE_PNN_), ID($_ALDFFE_PNP_), ID($_ALDFFE_PPN_), ID($_ALDFFE_PPP_)))
{ port(ID::D,1); port(ID::Q,1); port(ID::C,1); port(ID::L,1); port(ID::AD,1); port(ID::E,1); check_expected(); return; }
if (cell->type.in(
ID($_DFFSR_NNN_), ID($_DFFSR_NNP_), ID($_DFFSR_NPN_), ID($_DFFSR_NPP_),
ID($_DFFSR_PNN_), ID($_DFFSR_PNP_), ID($_DFFSR_PPN_), ID($_DFFSR_PPP_)))
@ -2675,6 +2724,40 @@ RTLIL::Cell* RTLIL::Module::addAdffe(RTLIL::IdString name, const RTLIL::SigSpec
return cell;
}
RTLIL::Cell* RTLIL::Module::addAldff(RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_aload, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q,
const RTLIL::SigSpec &sig_ad, bool clk_polarity, bool aload_polarity, const std::string &src)
{
RTLIL::Cell *cell = addCell(name, ID($aldff));
cell->parameters[ID::CLK_POLARITY] = clk_polarity;
cell->parameters[ID::ALOAD_POLARITY] = aload_polarity;
cell->parameters[ID::WIDTH] = sig_q.size();
cell->setPort(ID::CLK, sig_clk);
cell->setPort(ID::ALOAD, sig_aload);
cell->setPort(ID::D, sig_d);
cell->setPort(ID::AD, sig_ad);
cell->setPort(ID::Q, sig_q);
cell->set_src_attribute(src);
return cell;
}
RTLIL::Cell* RTLIL::Module::addAldffe(RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_en, const RTLIL::SigSpec &sig_aload, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q,
const RTLIL::SigSpec &sig_ad, bool clk_polarity, bool en_polarity, bool aload_polarity, const std::string &src)
{
RTLIL::Cell *cell = addCell(name, ID($aldffe));
cell->parameters[ID::CLK_POLARITY] = clk_polarity;
cell->parameters[ID::EN_POLARITY] = en_polarity;
cell->parameters[ID::ALOAD_POLARITY] = aload_polarity;
cell->parameters[ID::WIDTH] = sig_q.size();
cell->setPort(ID::CLK, sig_clk);
cell->setPort(ID::EN, sig_en);
cell->setPort(ID::ALOAD, sig_aload);
cell->setPort(ID::D, sig_d);
cell->setPort(ID::AD, sig_ad);
cell->setPort(ID::Q, sig_q);
cell->set_src_attribute(src);
return cell;
}
RTLIL::Cell* RTLIL::Module::addSdff(RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_srst, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q,
RTLIL::Const srst_value, bool clk_polarity, bool srst_polarity, const std::string &src)
{
@ -2865,6 +2948,33 @@ RTLIL::Cell* RTLIL::Module::addAdffeGate(RTLIL::IdString name, const RTLIL::SigS
return cell;
}
RTLIL::Cell* RTLIL::Module::addAldffGate(RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_aload, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q,
const RTLIL::SigSpec &sig_ad, bool clk_polarity, bool aload_polarity, const std::string &src)
{
RTLIL::Cell *cell = addCell(name, stringf("$_ALDFF_%c%c_", clk_polarity ? 'P' : 'N', aload_polarity ? 'P' : 'N'));
cell->setPort(ID::C, sig_clk);
cell->setPort(ID::L, sig_aload);
cell->setPort(ID::D, sig_d);
cell->setPort(ID::AD, sig_ad);
cell->setPort(ID::Q, sig_q);
cell->set_src_attribute(src);
return cell;
}
RTLIL::Cell* RTLIL::Module::addAldffeGate(RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_en, const RTLIL::SigSpec &sig_aload, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q,
const RTLIL::SigSpec &sig_ad, bool clk_polarity, bool en_polarity, bool aload_polarity, const std::string &src)
{
RTLIL::Cell *cell = addCell(name, stringf("$_ALDFFE_%c%c%c_", clk_polarity ? 'P' : 'N', aload_polarity ? 'P' : 'N', en_polarity ? 'P' : 'N'));
cell->setPort(ID::C, sig_clk);
cell->setPort(ID::L, sig_aload);
cell->setPort(ID::E, sig_en);
cell->setPort(ID::D, sig_d);
cell->setPort(ID::AD, sig_ad);
cell->setPort(ID::Q, sig_q);
cell->set_src_attribute(src);
return cell;
}
RTLIL::Cell* RTLIL::Module::addSdffGate(RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_srst, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q,
bool srst_value, bool clk_polarity, bool srst_polarity, const std::string &src)
{

6
kernel/rtlil.h
View File

@ -1312,6 +1312,8 @@ public:
RTLIL::Cell* addDffsre (RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_en, const RTLIL::SigSpec &sig_set, const RTLIL::SigSpec &sig_clr, RTLIL::SigSpec sig_d, const RTLIL::SigSpec &sig_q, bool clk_polarity = true, bool en_polarity = true, bool set_polarity = true, bool clr_polarity = true, const std::string &src = "");
RTLIL::Cell* addAdff (RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_arst, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q, RTLIL::Const arst_value, bool clk_polarity = true, bool arst_polarity = true, const std::string &src = "");
RTLIL::Cell* addAdffe (RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_en, const RTLIL::SigSpec &sig_arst, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q, RTLIL::Const arst_value, bool clk_polarity = true, bool en_polarity = true, bool arst_polarity = true, const std::string &src = "");
RTLIL::Cell* addAldff (RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_aload, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q, const RTLIL::SigSpec &sig_ad, bool clk_polarity = true, bool aload_polarity = true, const std::string &src = "");
RTLIL::Cell* addAldffe (RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_en, const RTLIL::SigSpec &sig_aload, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q, const RTLIL::SigSpec &sig_ad, bool clk_polarity = true, bool en_polarity = true, bool aload_polarity = true, const std::string &src = "");
RTLIL::Cell* addSdff (RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_srst, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q, RTLIL::Const srst_value, bool clk_polarity = true, bool srst_polarity = true, const std::string &src = "");
RTLIL::Cell* addSdffe (RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_en, const RTLIL::SigSpec &sig_srst, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q, RTLIL::Const srst_value, bool clk_polarity = true, bool en_polarity = true, bool srst_polarity = true, const std::string &src = "");
RTLIL::Cell* addSdffce (RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_en, const RTLIL::SigSpec &sig_srst, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q, RTLIL::Const srst_value, bool clk_polarity = true, bool en_polarity = true, bool srst_polarity = true, const std::string &src = "");
@ -1349,6 +1351,10 @@ public:
bool arst_value = false, bool clk_polarity = true, bool arst_polarity = true, const std::string &src = "");
RTLIL::Cell* addAdffeGate (RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_en, const RTLIL::SigSpec &sig_arst, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q,
bool arst_value = false, bool clk_polarity = true, bool en_polarity = true, bool arst_polarity = true, const std::string &src = "");
RTLIL::Cell* addAldffGate (RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_aload, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q,
const RTLIL::SigSpec &sig_ad, bool clk_polarity = true, bool aload_polarity = true, const std::string &src = "");
RTLIL::Cell* addAldffeGate (RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_en, const RTLIL::SigSpec &sig_aload, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q,
const RTLIL::SigSpec &sig_ad, bool clk_polarity = true, bool en_polarity = true, bool aload_polarity = true, const std::string &src = "");
RTLIL::Cell* addSdffGate (RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_srst, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q,
bool srst_value = false, bool clk_polarity = true, bool srst_polarity = true, const std::string &src = "");
RTLIL::Cell* addSdffeGate (RTLIL::IdString name, const RTLIL::SigSpec &sig_clk, const RTLIL::SigSpec &sig_en, const RTLIL::SigSpec &sig_srst, const RTLIL::SigSpec &sig_d, const RTLIL::SigSpec &sig_q,

15
manual/CHAPTER_CellLib.tex
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@ -287,13 +287,24 @@ The state of \B{Q} will be set to this value when the reset is active.
Note that the {\tt \$adff} and {\tt \$sdff} cells can only be used when the reset value is constant.
D-type flip-flops with asynchronous load are represented by {\tt \$aldff} cells. As the {\tt \$dff}
cells they have \B{CLK}, \B{D} and \B{Q} ports. In addition they also have a single-bit \B{ALOAD}
input port for the async load enable pin, a \B{AD} input port with the same width as data for
the async load data, and the following additional parameter:
\begin{itemize}
\item \B{ALOAD\_POLARITY} \\
The asynchronous load is active-high if this parameter has the value {\tt 1'b1} and active-low
if this parameter is {\tt 1'b0}.
\end{itemize}
D-type flip-flops with asynchronous set and reset are represented by {\tt \$dffsr} cells.
As the {\tt \$dff} cells they have \B{CLK}, \B{D} and \B{Q} ports. In addition they also have
multi-bit \B{SET} and \B{CLR} input ports and the corresponding polarity parameters, like
{\tt \$sr} cells.
D-type flip-flops with enable are represented by {\tt \$dffe}, {\tt \$adffe}, {\tt \$dffsre},
{\tt \$sdffe}, and {\tt \$sdffce} cells, which are enhanced variants of {\tt \$dff}, {\tt \$adff}, {\tt \$dffsr},
D-type flip-flops with enable are represented by {\tt \$dffe}, {\tt \$adffe}, {\tt \$aldffe}, {\tt \$dffsre},
{\tt \$sdffe}, and {\tt \$sdffce} cells, which are enhanced variants of {\tt \$dff}, {\tt \$adff}, {\tt \$aldff}, {\tt \$dffsr},
{\tt \$sdff} (with reset over enable) and {\tt \$sdff} (with enable over reset)
cells, respectively. They have the same ports and parameters as their base cell.
In addition they also have a single-bit \B{EN} input port for the enable pin and the following parameter:

49
techlibs/common/gen_fine_ffs.py
View File

@ -133,6 +133,55 @@ endmodule
"""
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_ALDFF_{C:N|P}{L:N|P}_ (D, C, L, AD, Q)
//-
//- A {C:negative|positive} edge D-type flip-flop with {L:negative|positive} polarity async load.
//-
//- Truth table: D C L AD | Q
//- ----------+---
//- - - {L:0|1} a | a
//- d {C:\\|/} - - | d
//- - - - - | q
//-
module \$_ALDFF_{C:N|P}{L:N|P}_ (D, C, L, AD, Q);
input D, C, L, AD;
output reg Q;
always @({C:neg|pos}edge C or {L:neg|pos}edge L) begin
if (L == {L:0|1})
Q <= AD;
else
Q <= D;
end
endmodule
""",
"""
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_ALDFFE_{C:N|P}{L:N|P}{E:N|P}_ (D, C, L, AD, E, Q)
//-
//- A {C:negative|positive} edge D-type flip-flop with {L:negative|positive} polarity async load and {E:negative|positive}
//- polarity clock enable.
//-
//- Truth table: D C L AD E | Q
//- ------------+---
//- - - {L:0|1} a - | a
//- d {C:\\|/} - - {E:0|1} | d
//- - - - - - | q
//-
module \$_ALDFFE_{C:N|P}{L:N|P}{E:N|P}_ (D, C, L, AD, E, Q);
input D, C, L, AD, E;
output reg Q;
always @({C:neg|pos}edge C or {L:neg|pos}edge L) begin
if (L == {L:0|1})
Q <= AD;
else if (E == {E:0|1})
Q <= D;
end
endmodule
""",
"""
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_DFFSR_{C:N|P}{S:N|P}{R:N|P}_ (C, S, R, D, Q)
//-
//- A {C:negative|positive} edge D-type flip-flop with {S:negative|positive} polarity set and {R:negative|positive}

284
techlibs/common/simcells.v
View File

@ -1252,6 +1252,290 @@ always @(posedge C or posedge R) begin
end
endmodule
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_ALDFF_NN_ (D, C, L, AD, Q)
//-
//- A negative edge D-type flip-flop with negative polarity async load.
//-
//- Truth table: D C L AD | Q
//- ----------+---
//- - - 0 a | a
//- d \ - - | d
//- - - - - | q
//-
module \$_ALDFF_NN_ (D, C, L, AD, Q);
input D, C, L, AD;
output reg Q;
always @(negedge C or negedge L) begin
if (L == 0)
Q <= AD;
else
Q <= D;
end
endmodule
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_ALDFF_NP_ (D, C, L, AD, Q)
//-
//- A negative edge D-type flip-flop with positive polarity async load.
//-
//- Truth table: D C L AD | Q
//- ----------+---
//- - - 1 a | a
//- d \ - - | d
//- - - - - | q
//-
module \$_ALDFF_NP_ (D, C, L, AD, Q);
input D, C, L, AD;
output reg Q;
always @(negedge C or posedge L) begin
if (L == 1)
Q <= AD;
else
Q <= D;
end
endmodule
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_ALDFF_PN_ (D, C, L, AD, Q)
//-
//- A positive edge D-type flip-flop with negative polarity async load.
//-
//- Truth table: D C L AD | Q
//- ----------+---
//- - - 0 a | a
//- d / - - | d
//- - - - - | q
//-
module \$_ALDFF_PN_ (D, C, L, AD, Q);
input D, C, L, AD;
output reg Q;
always @(posedge C or negedge L) begin
if (L == 0)
Q <= AD;
else
Q <= D;
end
endmodule
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_ALDFF_PP_ (D, C, L, AD, Q)
//-
//- A positive edge D-type flip-flop with positive polarity async load.
//-
//- Truth table: D C L AD | Q
//- ----------+---
//- - - 1 a | a
//- d / - - | d
//- - - - - | q
//-
module \$_ALDFF_PP_ (D, C, L, AD, Q);
input D, C, L, AD;
output reg Q;
always @(posedge C or posedge L) begin
if (L == 1)
Q <= AD;
else
Q <= D;
end
endmodule
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_ALDFFE_NNN_ (D, C, L, AD, E, Q)
//-
//- A negative edge D-type flip-flop with negative polarity async load and negative
//- polarity clock enable.
//-
//- Truth table: D C L AD E | Q
//- ------------+---
//- - - 0 a - | a
//- d \ - - 0 | d
//- - - - - - | q
//-
module \$_ALDFFE_NNN_ (D, C, L, AD, E, Q);
input D, C, L, AD, E;
output reg Q;
always @(negedge C or negedge L) begin
if (L == 0)
Q <= AD;
else if (E == 0)
Q <= D;
end
endmodule
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_ALDFFE_NNP_ (D, C, L, AD, E, Q)
//-
//- A negative edge D-type flip-flop with negative polarity async load and positive
//- polarity clock enable.
//-
//- Truth table: D C L AD E | Q
//- ------------+---
//- - - 0 a - | a
//- d \ - - 1 | d
//- - - - - - | q
//-
module \$_ALDFFE_NNP_ (D, C, L, AD, E, Q);
input D, C, L, AD, E;
output reg Q;
always @(negedge C or negedge L) begin
if (L == 0)
Q <= AD;
else if (E == 1)
Q <= D;
end
endmodule
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_ALDFFE_NPN_ (D, C, L, AD, E, Q)
//-
//- A negative edge D-type flip-flop with positive polarity async load and negative
//- polarity clock enable.
//-
//- Truth table: D C L AD E | Q
//- ------------+---
//- - - 1 a - | a
//- d \ - - 0 | d
//- - - - - - | q
//-
module \$_ALDFFE_NPN_ (D, C, L, AD, E, Q);
input D, C, L, AD, E;
output reg Q;
always @(negedge C or posedge L) begin
if (L == 1)
Q <= AD;
else if (E == 0)
Q <= D;
end
endmodule
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_ALDFFE_NPP_ (D, C, L, AD, E, Q)
//-
//- A negative edge D-type flip-flop with positive polarity async load and positive
//- polarity clock enable.
//-
//- Truth table: D C L AD E | Q
//- ------------+---
//- - - 1 a - | a
//- d \ - - 1 | d
//- - - - - - | q
//-
module \$_ALDFFE_NPP_ (D, C, L, AD, E, Q);
input D, C, L, AD, E;
output reg Q;
always @(negedge C or posedge L) begin
if (L == 1)
Q <= AD;
else if (E == 1)
Q <= D;
end
endmodule
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_ALDFFE_PNN_ (D, C, L, AD, E, Q)
//-
//- A positive edge D-type flip-flop with negative polarity async load and negative
//- polarity clock enable.
//-
//- Truth table: D C L AD E | Q
//- ------------+---
//- - - 0 a - | a
//- d / - - 0 | d
//- - - - - - | q
//-
module \$_ALDFFE_PNN_ (D, C, L, AD, E, Q);
input D, C, L, AD, E;
output reg Q;
always @(posedge C or negedge L) begin
if (L == 0)
Q <= AD;
else if (E == 0)
Q <= D;
end
endmodule
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_ALDFFE_PNP_ (D, C, L, AD, E, Q)
//-
//- A positive edge D-type flip-flop with negative polarity async load and positive
//- polarity clock enable.
//-
//- Truth table: D C L AD E | Q
//- ------------+---
//- - - 0 a - | a
//- d / - - 1 | d
//- - - - - - | q
//-
module \$_ALDFFE_PNP_ (D, C, L, AD, E, Q);
input D, C, L, AD, E;
output reg Q;
always @(posedge C or negedge L) begin
if (L == 0)
Q <= AD;
else if (E == 1)
Q <= D;
end
endmodule
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_ALDFFE_PPN_ (D, C, L, AD, E, Q)
//-
//- A positive edge D-type flip-flop with positive polarity async load and negative
//- polarity clock enable.
//-
//- Truth table: D C L AD E | Q
//- ------------+---
//- - - 1 a - | a
//- d / - - 0 | d
//- - - - - - | q
//-
module \$_ALDFFE_PPN_ (D, C, L, AD, E, Q);
input D, C, L, AD, E;
output reg Q;
always @(posedge C or posedge L) begin
if (L == 1)
Q <= AD;
else if (E == 0)
Q <= D;
end
endmodule
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_ALDFFE_PPP_ (D, C, L, AD, E, Q)
//-
//- A positive edge D-type flip-flop with positive polarity async load and positive
//- polarity clock enable.
//-
//- Truth table: D C L AD E | Q
//- ------------+---
//- - - 1 a - | a
//- d / - - 1 | d
//- - - - - - | q
//-
module \$_ALDFFE_PPP_ (D, C, L, AD, E, Q);
input D, C, L, AD, E;
output reg Q;
always @(posedge C or posedge L) begin
if (L == 1)
Q <= AD;
else if (E == 1)
Q <= D;
end
endmodule
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
//-
//- $_DFFSR_NNN_ (C, S, R, D, Q)

49
techlibs/common/simlib.v
View File

@ -1890,6 +1890,30 @@ endmodule
// --------------------------------------------------------
module \$aldff (CLK, ALOAD, AD, D, Q);
parameter WIDTH = 0;
parameter CLK_POLARITY = 1'b1;
parameter ALOAD_POLARITY = 1'b1;
input CLK, ALOAD;
input [WIDTH-1:0] AD;
input [WIDTH-1:0] D;
output reg [WIDTH-1:0] Q;
wire pos_clk = CLK == CLK_POLARITY;
wire pos_aload = ALOAD == ALOAD_POLARITY;
always @(posedge pos_clk, posedge pos_aload) begin
if (pos_aload)
Q <= AD;
else
Q <= D;
end
endmodule
// --------------------------------------------------------
module \$sdff (CLK, SRST, D, Q);
parameter WIDTH = 0;
@ -1939,6 +1963,31 @@ endmodule
// --------------------------------------------------------
module \$aldffe (CLK, ALOAD, AD, EN, D, Q);
parameter WIDTH = 0;
parameter CLK_POLARITY = 1'b1;
parameter EN_POLARITY = 1'b1;
parameter ALOAD_POLARITY = 1'b1;
input CLK, ALOAD, EN;
input [WIDTH-1:0] D;
input [WIDTH-1:0] AD;
output reg [WIDTH-1:0] Q;
wire pos_clk = CLK == CLK_POLARITY;
wire pos_aload = ALOAD == ALOAD_POLARITY;
always @(posedge pos_clk, posedge pos_aload) begin
if (pos_aload)
Q <= AD;
else if (EN == EN_POLARITY)
Q <= D;
end
endmodule
// --------------------------------------------------------
module \$sdffe (CLK, SRST, EN, D, Q);
parameter WIDTH = 0;