read_verilog <<EOT module clkbuf (input i, (* clkbuf_driver *) output o); endmodule module inbuf (input i, output o); endmodule module clkinbuf (input i, (* clkbuf_driver *) output o); endmodule module dff ((* clkbuf_sink *) input clk, input d, output q); endmodule module dffe ((* clkbuf_sink *) input c, input d, e, output q); endmodule module latch (input e, d, output q); endmodule module clkgen (output o); endmodule module inv ((* clkbuf_inv = "i" *) output o, input i); endmodule module top(input clk1, clk2, clk3, d, e, output [4:0] q); wire clk4, clk5, clk6; dff s0 (.clk(clk1), .d(d), .q(q[0])); dffe s1 (.c(clk2), .d(d), .e(e), .q(q[1])); latch s2 (.e(clk3), .d(d), .q(q[2])); sub s3 (.sclk4(clk4), .sclk5(clk5), .sclk6(clk6), .sd(d), .sq(q[3])); dff s4 (.clk(clk4), .d(d), .q(q[4])); dff s5 (.clk(clk5), .d(d), .q(q[4])); dff s6 (.clk(clk6), .d(d), .q(q[4])); endmodule module sub(output sclk4, output sclk5, output sclk6, input sd, output sq); wire sclk7, sclk8, sclk9; wire siq; wire tmp; clkgen s7(.o(sclk4)); clkgen s8(.o(sclk5)); clkgen s9(.o(tmp)); clkbuf s10(.i(tmp), .o(sclk7)); dff s11(.clk(sclk4), .d(sd), .q(siq)); inv s15(.i(sclk7), .o(sclk6)); clkgen s12(.o(sclk8)); inv s13(.o(sclk9), .i(sclk8)); dff s14(.clk(sclk9), .d(siq), .q(sq)); endmodule EOT hierarchy -auto-top design -save ref # ---------------------- design -load ref clkbufmap -buf clkbuf o:i select -assert-count 3 top/t:clkbuf select -assert-count 3 sub/t:clkbuf select -set clk1 w:clk1 %a %co t:clkbuf %i # Find 'clk1' fanouts that are 'clkbuf' select -assert-count 1 @clk1 # Check there is one such fanout select -assert-count 1 @clk1 %x:+[o] %co c:s* %i # Check that the 'o' of that clkbuf drives one fanout select -assert-count 1 @clk1 %x:+[o] %co c:s0 %i # And that one fanout is 's0' select -set clk2 w:clk2 %a %co t:clkbuf %i select -assert-count 1 @clk2 select -assert-count 1 @clk2 %x:+[o] %co c:s* %i select -assert-count 1 @clk2 %x:+[o] %co c:s1 %i select -set clk5 w:clk5 %a %ci t:clkbuf %i select -assert-count 1 @clk5 select -assert-count 1 @clk5 %x:+[o] %co c:s5 %i select -assert-count 1 @clk5 %x:+[i] %ci c:s3 %i select -set sclk4 w:sclk4 %a %ci t:clkbuf %i select -assert-count 1 @sclk4 select -assert-count 1 @sclk4 %x:+[o] %co c:s11 %i select -assert-count 1 @sclk4 %x:+[i] %ci c:s7 %i select -set sclk8 w:sclk8 %a %ci t:clkbuf %i select -assert-count 1 @sclk8 select -assert-count 1 @sclk8 %x:+[o] %co c:s13 %i select -assert-count 1 @sclk8 %x:+[i] %ci c:s12 %i # ---------------------- design -load ref setattr -set clkbuf_inhibit 0 w:clk1 setattr -set clkbuf_inhibit 1 w:clk2 clkbufmap -buf clkbuf o:i select -assert-count 2 top/t:clkbuf select -set clk1 w:clk1 %a %co t:clkbuf %i # Find 'clk1' fanouts that are 'clkbuf' select -assert-count 1 @clk1 # Check there is one such fanout select -assert-count 1 @clk1 %x:+[o] %co c:s* %i # Check that the 'o' of that clkbuf drives one fanout select -assert-count 1 @clk1 %x:+[o] %co c:s0 %i # And that one fanout is 's0' select -assert-count 0 w:clk2 %a %co t:clkbuf %i # ---------------------- design -load ref setattr -set clkbuf_inhibit 1 w:clk1 setattr -set buffer_type "bufg" w:clk2 clkbufmap -buf clkbuf o:i w:* a:buffer_type=none a:buffer_type=bufr %u %d select -assert-count 3 top/t:clkbuf select -assert-count 3 sub/t:clkbuf select -set clk1 w:clk1 %a %co t:clkbuf %i # Find 'clk1' fanouts that are 'clkbuf' select -assert-count 1 @clk1 # Check there is one such fanout select -assert-count 1 @clk1 %x:+[o] %co c:s* %i # Check that the 'o' of that clkbuf drives one fanout select -assert-count 1 @clk1 %x:+[o] %co c:s0 %i # And that one fanout is 's0' select -set clk2 w:clk2 %a %co t:clkbuf %i # Find 'clk1' fanouts that are 'clkbuf' select -assert-count 1 @clk2 # Check there is one such fanout select -assert-count 1 @clk2 %x:+[o] %co c:s* %i # Check that the 'o' of that clkbuf drives one fanout select -assert-count 1 @clk2 %x:+[o] %co c:s1 %i # And that one fanout is 's0' # ---------------------- design -load ref setattr -set buffer_type "none" w:clk1 setattr -set buffer_type "bufr" w:clk2 setattr -set buffer_type "bufr" w:sclk4 setattr -set buffer_type "bufr" w:sclk5 clkbufmap -buf clkbuf o:i w:* a:buffer_type=none a:buffer_type=bufr %u %d select -assert-count 0 w:clk1 %a %co t:clkbuf %i select -assert-count 0 w:clk2 %a %co t:clkbuf %i select -assert-count 0 top/t:clkbuf select -assert-count 2 sub/t:clkbuf # ---------------------- design -load ref clkbufmap -buf clkbuf o:i -inpad inbuf o:i select -assert-count 3 top/t:clkbuf select -assert-count 3 sub/t:clkbuf select -assert-count 2 top/t:inbuf select -assert-count 0 sub/t:inbuf select -set clk1 w:clk1 %a %co t:inbuf %i select -assert-count 1 @clk1 select -assert-count 1 @clk1 %x:+[o] %co t:clkbuf %i select -set clk1b @clk1 %x:+[o] %co t:clkbuf %i select -assert-count 1 @clk1b %x:+[o] %co c:s* %i select -assert-count 1 @clk1b %x:+[o] %co c:s0 %i select -set clk2 w:clk2 %a %co t:inbuf %i select -assert-count 1 @clk2 select -assert-count 1 @clk2 %x:+[o] %co t:clkbuf %i select -set clk2b @clk2 %x:+[o] %co t:clkbuf %i select -assert-count 1 @clk2b %x:+[o] %co c:s* %i select -assert-count 1 @clk2b %x:+[o] %co c:s1 %i select -set clk5 w:clk5 %a %ci t:clkbuf %i select -assert-count 1 @clk5 select -assert-count 1 @clk5 %x:+[o] %co c:s5 %i select -assert-count 1 @clk5 %x:+[i] %ci c:s3 %i select -set sclk4 w:sclk4 %a %ci t:clkbuf %i select -assert-count 1 @sclk4 select -assert-count 1 @sclk4 %x:+[o] %co c:s11 %i select -assert-count 1 @sclk4 %x:+[i] %ci c:s7 %i select -set sclk8 w:sclk8 %a %ci t:clkbuf %i select -assert-count 1 @sclk8 select -assert-count 1 @sclk8 %x:+[o] %co c:s13 %i select -assert-count 1 @sclk8 %x:+[i] %ci c:s12 %i # ---------------------- design -load ref clkbufmap -inpad inbuf o:i select -assert-count 2 top/t:inbuf select -assert-count 0 sub/t:inbuf select -set clk1 w:clk1 %a %co t:inbuf %i select -assert-count 1 @clk1 select -assert-count 1 @clk1 %x:+[o] %co c:s* %i select -assert-count 1 @clk1 %x:+[o] %co c:s0 %i select -set clk2 w:clk2 %a %co t:inbuf %i select -assert-count 1 @clk2 select -assert-count 1 @clk2 %x:+[o] %co c:s* %i select -assert-count 1 @clk2 %x:+[o] %co c:s1 %i # ---------------------- design -load ref clkbufmap -buf clkbuf o:i -inpad clkinbuf o:i select -assert-count 1 top/t:clkbuf select -assert-count 3 sub/t:clkbuf select -assert-count 2 top/t:clkinbuf select -assert-count 0 sub/t:clkinbuf select -set clk1 w:clk1 %a %co t:clkinbuf %i select -assert-count 1 @clk1 select -assert-count 1 @clk1 %x:+[o] %co c:s* %i select -assert-count 1 @clk1 %x:+[o] %co c:s0 %i select -set clk2 w:clk2 %a %co t:clkinbuf %i select -assert-count 1 @clk2 select -assert-count 1 @clk2 %x:+[o] %co c:s* %i select -assert-count 1 @clk2 %x:+[o] %co c:s1 %i select -set clk5 w:clk5 %a %ci t:clkbuf %i select -assert-count 1 @clk5 select -assert-count 1 @clk5 %x:+[o] %co c:s5 %i select -assert-count 1 @clk5 %x:+[i] %ci c:s3 %i select -set sclk4 w:sclk4 %a %ci t:clkbuf %i select -assert-count 1 @sclk4 select -assert-count 1 @sclk4 %x:+[o] %co c:s11 %i select -assert-count 1 @sclk4 %x:+[i] %ci c:s7 %i select -set sclk8 w:sclk8 %a %ci t:clkbuf %i select -assert-count 1 @sclk8 select -assert-count 1 @sclk8 %x:+[o] %co c:s13 %i select -assert-count 1 @sclk8 %x:+[i] %ci c:s12 %i