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[/] [xilinx_virtex_fp_library/] [trunk/] [GeneralPrecMAF/] [Multiply_Accumulate.v] - Rev 7
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`timescale 1ns / 1ps ////////////////////////////////////////////////////////////////////////////////// // Company: // Engineer: // // Create Date: 17:53:05 10/15/2013 // Design Name: // Module Name: Multiply_Accumulate // Project Name: // Target Devices: // Tool versions: // Description: C ± A*B // // Dependencies: // // Revision: // Revision 0.01 - File Created // Additional Comments: // ////////////////////////////////////////////////////////////////////////////////// module Multiply_Accumulate #( parameter size_exponent = 8, //exponent bits parameter size_mantissa = 24, //mantissa bits parameter size_counter = 5, //log2(size_mantissa) + 1 = 5 parameter size_exception_field = 2, // zero/normal numbers/infinity/NaN parameter zero = 00, //00 parameter normal_number = 01, //01 parameter infinity = 10, //10 parameter NaN = 11, //11 parameter pipeline = 0, parameter pipeline_pos = 0, //8 bits parameter size = size_exponent + size_mantissa + size_exception_field, parameter size_mul_mantissa = size_mantissa + size_mantissa, parameter size_mul_counter = size_counter + 1) ( input clk, input rst, input [size - 1:0] a_number_i, input [size - 1:0] b_number_i, input [size - 1:0] c_number_i, input sub, output[size - 1:0] resulting_number_o); wire [size_mantissa - 1 : 0] m_a_number, m_b_number, m_c_number; wire [size_exponent - 1 : 0] e_a_number, e_b_number, e_c_number; wire s_a_number, s_b_number, s_c_number; wire [size_exception_field - 1 : 0] sp_case_a_number, sp_case_b_number, sp_case_c_number; //--------------------------------------------------------------------------------------- wire [size_mul_mantissa-1:0] mul_mantissa, c_mantissa; wire [size_mul_mantissa :0] acc_resulting_number; wire [size_mul_mantissa :0] ab_shifted_mul_mantissa, c_shifted_mantissa; wire [size_exponent : 0] exp_ab; wire [size_exponent-1:0] modify_exp_ab, modify_exp_c; wire [size_mul_counter-1: 0] lz_mul; wire sign_res; wire eff_sub; wire ovf; wire comp_exp; wire [size_mul_mantissa+1:0] normalized_mantissa; wire [size_mantissa - 1 : 0] rounded_mantissa; wire [size_exponent :0] unnormalized_exp; wire [size_mantissa-2:0] final_mantissa; wire [size_exponent-1:0] final_exponent; wire [size_exception_field - 1 : 0] sp_case_result_o; assign m_a_number = {1'b1, a_number_i[size_mantissa - 2 :0]}; assign m_b_number = {1'b1, b_number_i[size_mantissa - 2 :0]}; assign m_c_number = {1'b1, c_number_i[size_mantissa - 2 :0]}; assign e_a_number = a_number_i[size_mantissa + size_exponent - 1 : size_mantissa - 1]; assign e_b_number = b_number_i[size_mantissa + size_exponent - 1 : size_mantissa - 1]; assign e_c_number = c_number_i[size_mantissa + size_exponent - 1 : size_mantissa - 1]; assign s_a_number = a_number_i[size - size_exception_field - 1]; assign s_b_number = b_number_i[size - size_exception_field - 1]; assign s_c_number = c_number_i[size - size_exception_field - 1]; assign sp_case_a_number = a_number_i[size - 1 : size - size_exception_field]; assign sp_case_b_number = b_number_i[size - 1 : size - size_exception_field]; assign sp_case_c_number = c_number_i[size - 1 : size - size_exception_field]; //instantiate multiply component multiply #( .size_mantissa(size_mantissa), .size_counter(size_counter), .size_mul_mantissa(size_mul_mantissa)) multiply_instance ( .a_mantissa_i(m_a_number), .b_mantissa_i(m_b_number), .mul_mantissa(mul_mantissa)); assign c_mantissa = {1'b0,m_c_number, {(size_mantissa-1'b1){1'b0}}}; assign exp_ab = e_a_number + e_b_number - ({1'b1,{(size_exponent-1'b1){1'b0}}} - 1'b1); assign {modify_exp_ab, modify_exp_c, unnormalized_exp} = (exp_ab >= e_c_number)? {8'd0,(exp_ab - e_c_number), exp_ab} : {(e_c_number - exp_ab), 8'd0, {1'b0,e_c_number}}; //instantiate shifter component for mul_mantissa shift, mul_mantissa <=> ab_mantissa shifter #( .INPUT_SIZE(size_mul_mantissa), .SHIFT_SIZE(size_exponent), .OUTPUT_SIZE(size_mul_mantissa + 1'b1), .DIRECTION(1'b0), .PIPELINE(pipeline), .POSITION(pipeline_pos)) shifter_ab_instance( .a(mul_mantissa), .arith(1'b0), .shft(modify_exp_ab), .shifted_a(ab_shifted_mul_mantissa)); //instantiate shifter component for c_mantissa shift shifter #( .INPUT_SIZE(size_mul_mantissa), .SHIFT_SIZE(size_exponent), .OUTPUT_SIZE(size_mul_mantissa + 1'b1), .DIRECTION(1'b0), .PIPELINE(pipeline), .POSITION(pipeline_pos)) shifter_c_instance( .a(c_mantissa), .arith(1'b0), .shft(modify_exp_c), .shifted_a(c_shifted_mantissa)); //instantiate effective_op component effective_op effective_op_instance( .sign_a(s_a_number), .sign_b(s_b_number), .sign_c(s_c_number), .sub(sub), .eff_sub(eff_sub)); //instantiate accumulate component accumulate #( .size_mantissa(size_mantissa), .size_counter(size_counter), .size_mul_mantissa(size_mul_mantissa)) accumulate_instance ( .ab_number_i(ab_shifted_mul_mantissa[size_mul_mantissa:1]), .c_number_i(c_shifted_mantissa[size_mul_mantissa:1]), .sub(eff_sub), .ovf(ovf), .acc_resulting_number_o(acc_resulting_number)); //instantiate leading_zeros component leading_zeros #( .SIZE_INT(size_mul_mantissa + 1'b1), .SIZE_COUNTER(size_mul_counter), .PIPELINE(pipeline)) leading_zeros_instance( .a(acc_resulting_number), .ovf(ovf), .lz(lz_mul)); //instantiate shifter component shifter #( .INPUT_SIZE(size_mul_mantissa + 1'b1), .SHIFT_SIZE(size_mul_counter), .OUTPUT_SIZE(size_mul_mantissa + 2'd2), .DIRECTION(1'b1), .PIPELINE(pipeline), .POSITION(pipeline_pos)) shifter_instance( .a(acc_resulting_number), .arith(1'b0), .shft(lz_mul), .shifted_a(normalized_mantissa)); //instantiate rounding component rounding #( .SIZE_MOST_S_MANTISSA(size_mantissa), .SIZE_LEAST_S_MANTISSA(size_mul_mantissa-size_mantissa+2)) rounding_instance ( .unrounded_mantissa(normalized_mantissa[size_mul_mantissa+1 : size_mul_mantissa+2-size_mantissa]), .dummy_bits(normalized_mantissa[size_mul_mantissa+1-size_mantissa : 0]), .rounded_mantissa(rounded_mantissa)); //instantiate special_cases_mul_acc component special_cases_mul_acc #( .size_exception_field(size_exception_field), .zero(zero), .normal_number(normal_number), .infinity(infinity), .NaN(NaN)) special_cases_mul_acc_instance ( .sp_case_a_number(sp_case_a_number), .sp_case_b_number(sp_case_b_number), .sp_case_c_number(sp_case_c_number), .sp_case_result_o(sp_case_result_o)); //compute resulted_sign assign sign_res = (eff_sub)? ((c_shifted_mantissa > ab_shifted_mul_mantissa)? s_c_number : ~s_c_number) : s_c_number; assign final_exponent = unnormalized_exp - lz_mul + 2'd2; assign final_mantissa = rounded_mantissa[size_mantissa-2 : 0]; assign resulting_number_o = {sp_case_result_o, sign_res, final_exponent, final_mantissa}; endmodule
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