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architecture Behavioral of af_sigmoid is
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architecture Behavioral of af_sigmoid is
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-- Definition of internal modules, constants, signals, etc...
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-- Definition of internal modules, constants, signals, etc...
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-- Sigmoid parameters:
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-- Sigmoid parameters:
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constant f0 : real := 2.0; -- Slope at the origin
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constant f0 : real := 1.0; -- Slope at the origin
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constant fr : real := 2.0; -- fr = fmax - fmin
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constant fr : real := 2.0; -- fr = fmax - fmin
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signal dataIn: integer range (2**Nbit-1) downto 0; -- To convert std_logic_vector input to integer index for the LUT
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signal dataIn: integer range (2**Nbit-1) downto 0; -- To convert std_logic_vector input to integer index for the LUT
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type table_t is array(0 to (2**Nbit)-1) of std_logic_vector(Nbit-1 downto 0); -- LUT type
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type table_t is array(0 to (2**Nbit)-1) of std_logic_vector(Nbit-1 downto 0); -- LUT type
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-- Function Sigmoidal: generates the Look-Up-Table for the sigmoid activation function:
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-- Function Sigmoidal: generates the Look-Up-Table for the sigmoid activation function:
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-- margin: maximun value of x.
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-- margin: maximun value of x.sim:/ann_tb/ann1/layers_insts(1)/multiple_activation_functions/multiple_activation_function_insts(1)/activation_function_inst/Sigmoid_f/siglut_inst/Activation
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function Sigmoidal(margin:real;Nbit:natural) return table_t is
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function Sigmoidal(margin:real;Nbit:natural) return table_t is
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variable scale,x,y,w,t: real;
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variable scale,x,y,w,t: real;
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variable u: integer;
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variable u: integer;
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variable fbits: std_logic_vector(Nbit-1 downto 0);
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variable fbits: std_logic_vector(Nbit-1 downto 0);
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variable table: table_t;
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variable table: table_t;
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signal Table: table_t := Sigmoidal(1.0,Nbit); -- Generation of the LUT (at synthesis time)
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signal Table: table_t := Sigmoidal(1.0,Nbit); -- Generation of the LUT (at synthesis time)
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begin
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begin
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-- Description of the activation function
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-- Description of the activation function
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dataIn <= to_integer(signed(inputs));
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dataIn <= to_integer(unsigned(inputs));
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Activation: process(clk,reset)
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Activation: process(clk,reset)
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begin
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begin
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if clk'event and clk = '1' then
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if clk'event and clk = '1' then
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if reset = '1' then
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if reset = '1' then
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