diff --git a/hw/efinix_fpga/simulation/src/sim_top.sv b/hw/efinix_fpga/simulation/src/sim_top.sv
index 855ac03..d3d1b3c 100644
--- a/hw/efinix_fpga/simulation/src/sim_top.sv
+++ b/hw/efinix_fpga/simulation/src/sim_top.sv
@@ -34,7 +34,7 @@ end
 initial begin
     r_clk_cpu <= '1;
     forever begin
-        #125 r_clk_cpu <= ~r_clk_cpu;
+        #250 r_clk_cpu <= ~r_clk_cpu;
     end
 end