adding files

1 files changed, 19 insertions, 0 deletions

diff --git a/nghdl/Example/trial_fa/trial_fa.vhdl b/nghdl/Example/trial_fa/trial_fa.vhdl
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+++ b/nghdl/Example/trial_fa/trial_fa.vhdl
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+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+ 
+entity trial_fa is
+  port (
+    i_bit1  : in std_logic_vector(0 downto 0);
+    i_bit2  : in std_logic_vector(0 downto 0);
+    i_bit3  : in std_logic_vector(0 downto 0);
+    o_sum   : out std_logic_vector(0 downto 0);
+    o_carry : out std_logic_vector(0 downto 0)
+    );
+end trial_fa;
+ 
+architecture rtl of trial_fa is
+begin
+  o_sum   <= i_bit1 xor i_bit2 xor i_bit3;
+  o_carry <= (i_bit1 and i_bit2) or (i_bit2 and i_bit3) or (i_bit3 and i_bit1);
+end rtl;
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