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crpr for clk paths thru tristate enable 

Signed-off-by: James Cherry <cherry@parallaxsw.com>
This commit is contained in:
James Cherry 2025-03-17 14:58:15 -07:00
parent 710faf3d03
commit 8d32e876a5
2 changed files with 26 additions and 11 deletions
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4
include/sta/Search.hh
View File

@ -253,6 +253,7 @@ public:
const MinMax *min_max, const MinMax *min_max,
const PathAnalysisPt *path_ap); const PathAnalysisPt *path_ap);
Tag *thruClkTag(PathVertex *from_path, Tag *thruClkTag(PathVertex *from_path,
Vertex *from_vertex,
Tag *from_tag, Tag *from_tag,
bool to_propagates_clk, bool to_propagates_clk,
Edge *edge, Edge *edge,
@ -260,10 +261,13 @@ public:
const MinMax *min_max, const MinMax *min_max,
const PathAnalysisPt *path_ap); const PathAnalysisPt *path_ap);
ClkInfo *thruClkInfo(PathVertex *from_path, ClkInfo *thruClkInfo(PathVertex *from_path,
Vertex *from_vertex,
ClkInfo *from_clk_info, ClkInfo *from_clk_info,
bool from_is_clk,
Edge *edge, Edge *edge,
Vertex *to_vertex, Vertex *to_vertex,
const Pin *to_pin, const Pin *to_pin,
bool to_is_clk,
const MinMax *min_max, const MinMax *min_max,
const PathAnalysisPt *path_ap); const PathAnalysisPt *path_ap);
ClkInfo *clkInfoWithCrprClkPath(ClkInfo *from_clk_info, ClkInfo *clkInfoWithCrprClkPath(ClkInfo *from_clk_info,

33
search/Search.cc
View File

@ -2158,11 +2158,11 @@ PathVisitor::visitFromPath(const Pin *from_pin,
|| !gclk->combinational()) || !gclk->combinational())
&& fanins->hasKey(to_vertex) && fanins->hasKey(to_vertex)
&& !(fdbk_edges && fdbk_edges->hasKey(edge))) { && !(fdbk_edges && fdbk_edges->hasKey(edge))) {
to_tag = search_->thruClkTag(from_path, from_tag, true, edge, to_rf, to_tag = search_->thruClkTag(from_path, from_vertex, from_tag, true,
min_max, path_ap); edge, to_rf, min_max, path_ap);
if (to_tag) { if (to_tag) {
arc_delay = search_->deratedDelay(from_vertex, arc, edge, true, arc_delay = search_->deratedDelay(from_vertex, arc, edge,
path_ap); true, path_ap);
to_arrival = from_arrival + arc_delay; to_arrival = from_arrival + arc_delay;
} }
} }
@ -2242,8 +2242,9 @@ PathVisitor::visitFromPath(const Pin *from_pin,
|| role == TimingRole::tristateDisable())); || role == TimingRole::tristateDisable()));
arc_delay = search_->deratedDelay(from_vertex, arc, edge, arc_delay = search_->deratedDelay(from_vertex, arc, edge,
to_propagates_clk, path_ap); to_propagates_clk, path_ap);
to_tag = search_->thruClkTag(from_path, from_tag, to_propagates_clk, to_tag = search_->thruClkTag(from_path, from_vertex, from_tag,
edge, to_rf, min_max, path_ap); to_propagates_clk, edge, to_rf,
min_max, path_ap);
to_arrival = from_arrival + arc_delay; to_arrival = from_arrival + arc_delay;
} }
} }
@ -2432,8 +2433,10 @@ Search::thruTag(Tag *from_tag,
return to_tag; return to_tag;
} }
// thruTag for clocks.
Tag * Tag *
Search::thruClkTag(PathVertex *from_path, Search::thruClkTag(PathVertex *from_path,
Vertex *from_vertex,
Tag *from_tag, Tag *from_tag,
bool to_propagates_clk, bool to_propagates_clk,
Edge *edge, Edge *edge,
@ -2453,8 +2456,8 @@ Search::thruClkTag(PathVertex *from_path,
&& to_propagates_clk && to_propagates_clk
&& (role->isWire() && (role->isWire()
|| role == TimingRole::combinational())); || role == TimingRole::combinational()));
ClkInfo *to_clk_info = thruClkInfo(from_path, from_clk_info, ClkInfo *to_clk_info = thruClkInfo(from_path, from_vertex, from_clk_info, from_is_clk,
edge, to_vertex, to_pin, edge, to_vertex, to_pin, to_is_clk,
min_max, path_ap); min_max, path_ap);
Tag *to_tag = mutateTag(from_tag,from_pin,from_rf,from_is_clk,from_clk_info, Tag *to_tag = mutateTag(from_tag,from_pin,from_rf,from_is_clk,from_clk_info,
to_pin, to_rf, to_is_clk, to_is_reg_clk, false, to_pin, to_rf, to_is_clk, to_is_reg_clk, false,
@ -2462,13 +2465,15 @@ Search::thruClkTag(PathVertex *from_path,
return to_tag; return to_tag;
} }
// thruTag for clocks.
ClkInfo * ClkInfo *
Search::thruClkInfo(PathVertex *from_path, Search::thruClkInfo(PathVertex *from_path,
Vertex *from_vertex,
ClkInfo *from_clk_info, ClkInfo *from_clk_info,
bool from_is_clk,
Edge *edge, Edge *edge,
Vertex *to_vertex, Vertex *to_vertex,
const Pin *to_pin, const Pin *to_pin,
bool to_is_clk,
const MinMax *min_max, const MinMax *min_max,
const PathAnalysisPt *path_ap) const PathAnalysisPt *path_ap)
{ {
@ -2499,7 +2504,13 @@ Search::thruClkInfo(PathVertex *from_path,
PathVertex *to_crpr_clk_path = nullptr; PathVertex *to_crpr_clk_path = nullptr;
if (sdc_->crprActive() if (sdc_->crprActive()
&& to_vertex->isRegClk()) { // Update crpr clk path for combinational paths leaving the clock
// network (ie, tristate en->out) and buffer driving reg clk.
&& ((from_is_clk
&& !to_is_clk
&& !from_vertex->isRegClk())
|| to_vertex->isRegClk())) {
//printf("%s -> %s\n", from_vertex->name(network_), to_vertex->name(network_));
to_crpr_clk_path = from_path; to_crpr_clk_path = from_path;
changed = true; changed = true;
} }