原创 Report registers without clock in DC

How can I get a report for registers that do not have a clock in Design Compiler?

Answer:

You can use the following script in Design Compiler to report registers without clocks:

dc_shell> set design_all_clocks [all_clocks]
{clk1 clk2 clk3 clk4}

dc_shell> foreach_in_collection clk $design_all_clocks {
set no_clock_reg [remove_from_collection [all_registers] [all_registers -clock $clk]]
}

dc_shell> query_objects $no_clock_reg
{U1}

In PrimeTime, you can use the -verbose option with the check_timing command to list 
all registers that do not have a clock.