/* Author: Brian Hill
 * Date:
 * Module: relu_backprop
 * Desc:  The backpropagation calculation for the ReLU layer
 *        using single precision floating point values
 */

module relu_backprop( input   logic   clk,
                      input   logic [31:0] in_data[WIDTH-1:0],
                      output  logic [31:0] out_data[WIDTH-1:0])
  parameter NEGATIVE_SLOPE = 0.0
  parameter WIDTH = 256

  // for each value 'x' in the input vector, calculate max(0, 'x')
  for i in 0:WIDTH-1
  	// if input data 'x' greater than 0, pass along to output
  	if in_data[i] > 0
    	out_data[i] = in_data[i]
    // otherwise we pass along negative slope value (usually 0)
    else
    	out_data[i] = NEGATIVE_SLOPE

endmodule