create_clock -name {clk} -period 25 -waveform {0 12.5 } [ get_ports { clk } ]
create_clock -name {clkDiv64} -period 1600 -waveform {0 800 } [ get_ports { clkDiv64 } ]
create_clock -name {clkDiv128} -period 3200 -waveform {0 1600 } [ get_ports { clkDiv128 } ]