finding process operating on falling edge

Run "Report Clock Transfers" to see numbers on all types of transfers(rr is rising edge to rising edge, rf is rising to falling, etc.). For specific paths, you can do:

report_timing -setup -npaths 200 -detail full_path -rise_from * -fall_to * -panel_name "200 rise to fall transfers"

This just shows rise to fall, regardless of clock. You coul also do:

report_timing -setup -npaths 200 -detail full_path -rise_from_clock SRC_CLK -fall_to_clock DST_CLK -panel_name "rise of SRC_CLK to fall of DST_CLK"

This will do it for specific clocks. You can combine these, do different rise/fall variations,etc.