sta: very crude static timing analysis pass

Co-authored-by: Eddie Hung <eddie@fpgeh.com>

1 files changed, 81 insertions, 0 deletions

diff --git a/tests/various/sta.ys b/tests/various/sta.ys
new file mode 100644
index 000000000..156c31c47
--- /dev/null
+++ b/tests/various/sta.ys
@@ -0,0 +1,81 @@
+read_verilog -specify <<EOT
+module buffer(input i, output o);
+specify
+(i => o) = 10;
+endspecify
+endmodule
+
+module top(input i);
+wire w;
+buffer b(.i(i), .o(w));
+endmodule
+EOT
+
+logger -expect warning "Critical-path does not terminate in a recognised endpoint\." 1
+sta
+
+
+design -reset
+read_verilog -specify <<EOT
+module top(input i, output o, p);
+assign o = i;
+endmodule
+EOT
+
+logger -expect log "No timing paths found\." 1
+sta
+
+
+design -reset
+read_verilog -specify <<EOT
+module buffer(input i, output o);
+specify
+(i => o) = 10;
+endspecify
+endmodule
+
+module top(input i, output o, p);
+buffer b(.i(i), .o(o));
+endmodule
+EOT
+
+sta
+
+
+design -reset
+read_verilog -specify <<EOT
+module buffer(input i, output o);
+specify
+(i => o) = 10;
+endspecify
+endmodule
+
+module top(input i, output o, p);
+buffer b(.i(i), .o(o));
+const0 c(.o(p));
+endmodule
+EOT
+
+logger -expect warning "Cell type 'const0' not recognised! Ignoring\." 1
+sta
+
+
+design -reset
+read_verilog -specify <<EOT
+module buffer(input i, output o);
+specify
+(i => o) = 10;
+endspecify
+endmodule
+module const0(output o);
+endmodule
+
+module top(input i, output o, p);
+buffer b(.i(i), .o(o));
+const0 c(.o(p));
+endmodule
+EOT
+
+sta
+
+logger -expect-no-warnings