1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2020 Marcelina Kościelnicka <mwk@0x04.net>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "kernel/yosys.h"
#include "kernel/sigtools.h"
#include "kernel/ff.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct DffunmapPass : public Pass {
DffunmapPass() : Pass("dffunmap", "unmap clock enable and synchronous reset from FFs") { }
void help() override
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" dffunmap [options] [selection]\n");
log("\n");
log("This pass transforms FF types with clock enable and/or synchronous reset into\n");
log("their base type (with neither clock enable nor sync reset) by emulating the\n");
log("clock enable and synchronous reset with multiplexers on the cell input.\n");
log("\n");
log(" -ce-only\n");
log(" unmap only clock enables, leave synchronous resets alone.\n");
log("\n");
log(" -srst-only\n");
log(" unmap only synchronous resets, leave clock enables alone.\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
{
log_header(design, "Executing DFFUNMAP pass (unmap clock enable and synchronous reset from FFs).\n");
bool ce_only = false;
bool srst_only = false;
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++) {
if (args[argidx] == "-ce-only") {
ce_only = true;
continue;
}
if (args[argidx] == "-srst-only") {
srst_only = true;
continue;
}
break;
}
extra_args(args, argidx, design);
if (ce_only && srst_only)
log_cmd_error("Options -ce-only and -srst-only are mutually exclusive!\n");
for (auto mod : design->selected_modules())
{
SigMap sigmap(mod);
FfInitVals initvals(&sigmap, mod);
for (auto cell : mod->selected_cells())
{
if (!RTLIL::builtin_ff_cell_types().count(cell->type))
continue;
FfData ff(&initvals, cell);
IdString name = cell->name;
if (!ff.has_clk)
continue;
if (ce_only) {
if (!ff.has_ce)
continue;
ff.unmap_ce();
} else if (srst_only) {
if (!ff.has_srst)
continue;
ff.unmap_srst();
} else {
if (!ff.has_ce && !ff.has_srst)
continue;
ff.unmap_ce_srst();
}
ff.emit();
}
}
}
} DffunmapPass;
PRIVATE_NAMESPACE_END
|
