added CMAC interface out of QSFP3

source/axis_demux_128b.vhd

@@ -0,0 +1,46 @@
+library IEEE;
+use IEEE.STD_LOGIC_1164.ALL;
+Library xpm;
+use xpm.vcomponents.all;
+
+-- Uncomment the following library declaration if using
+-- arithmetic functions with Signed or Unsigned values
+--use IEEE.NUMERIC_STD.ALL;
+
+-- Uncomment the following library declaration if instantiating
+-- any Xilinx leaf cells in this code.
+--library UNISIM;
+--use UNISIM.VComponents.all;
+
+entity axis_demux_128b is
+  port ( 
+    aselect                     : in  std_logic;
+
+    s_axis_tdata                : in  std_logic_vector(127 downto 0);
+    s_axis_tvalid               : in  std_logic;
+    s_axis_tready               : out std_logic;
+
+    m0_axis_tdata               : out std_logic_vector(127 downto 0);
+    m0_axis_tvalid              : out std_logic;
+    m0_axis_tready              : in  std_logic;
+
+    m1_axis_tdata               : out std_logic_vector(127 downto 0);
+    m1_axis_tvalid              : out std_logic;
+    m1_axis_tready              : in  std_logic
+    );
+end entity axis_demux_128b;
+
+architecture imp of axis_demux_128b is
+
+begin
+     
+  m0_axis_tdata    <= s_axis_tdata;
+  m0_axis_tvalid   <= s_axis_tvalid  when aselect = '0' else '0';
+
+  m1_axis_tdata    <= s_axis_tdata; 
+  m1_axis_tvalid   <= s_axis_tvalid  when aselect = '1' else '0';
+    
+  s_axis_tready    <= m0_axis_tready when aselect = '0' else m1_axis_tready;
+
+end imp;
+