diff --git a/lib/sim_components.vhd b/lib/sim_components.vhd
new file mode 100644
index 0000000..631a807
--- /dev/null
+++ b/lib/sim_components.vhd
@@ -0,0 +1,72 @@
+library ieee ;
+use ieee.std_logic_1164.all;
+use ieee.math_real.all;
+
+
+entity CC_PLL is
+generic (
+  REF_CLK         : string := "0";          -- reference clk in MHz
+  OUT_CLK         : string := "0";          -- output clk in MHz
+  PERF_MD         : string := "UNDEFINED";  -- LOWPOWER, ECONOMY, SPEED (optional, global, setting of Place&Route can be used instead)
+  LOW_JITTER      : natural := 1;           -- 0: disable, 1: enable low jitter mode
+  CI_FILTER_CONST : natural := 2;           -- optional CI filter constant
+  CP_FILTER_CONST : natural := 4            -- optional CP filter constant
+);
+port (
+  CLK_REF             : in std_logic;
+  CLK_FEEDBACK        : in std_logic;
+  USR_CLK_REF         : in std_logic;
+  USR_LOCKED_STDY_RST : in std_logic;
+  USR_PLL_LOCKED_STDY : out std_logic;
+  USR_PLL_LOCKED      : out std_logic;
+  CLK270              : out std_logic;
+  CLK180              : out std_logic;
+  CLK0                : out std_logic := '1';
+  CLK90               : out std_logic := '0';
+  CLK_REF_OUT         : out std_logic
+);
+end entity;
+
+
+architecture sim of CC_PLL is
+
+  constant c_period_ns : real := (1000.0 / real'value(OUT_CLK));
+  constant c_half_period_ns : real := c_period_ns / 2.0;
+
+begin
+
+  Log : process is
+  begin
+    report CC_PLL'instance_name & " CC_PLL CLK0 = " & to_string(1000.0/(c_period_ns), 2) & " MHz";
+    wait;
+  end process;
+  
+  CLK0   <= not CLK0 after c_half_period_ns * ns;
+  CLK90  <= transport CLK0 after (c_half_period_ns / 2.0) * ns;
+  CLK180 <= not CLK0;
+  CLK270 <= not CLK90;
+
+  CLK_REF_OUT <= CLK_REF;
+
+  USR_PLL_LOCKED <= '1';
+
+end architecture;
+
+
+library ieee ;
+use ieee.std_logic_1164.all;
+
+
+entity CC_CFG_END is
+port (
+  CFG_END : out std_logic
+);
+end entity;
+
+
+architecture sim of CC_CFG_END is
+begin
+
+  CFG_END <= '1';
+
+end architecture;