diff --git a/rtl/ibex_multdiv_fast.sv b/rtl/ibex_multdiv_fast.sv index bbe69fa7..a63fee5f 100644 --- a/rtl/ibex_multdiv_fast.sv +++ b/rtl/ibex_multdiv_fast.sv @@ -59,7 +59,7 @@ module ibex_multdiv_fast ( logic signed [34:0] mac_res_signed; logic [34:0] mac_res_ext; - logic [33:0] mac_res_q, mac_res_n, mac_res, op_reminder_n; + logic [33:0] mac_res_q, mac_res_n, mac_res, op_remainder_n; logic [15:0] mult_op_a; logic [15:0] mult_op_b; logic [33:0] accum; @@ -75,7 +75,7 @@ module ibex_multdiv_fast ( logic [31:0] op_denominator_n; logic [31:0] op_numerator_n; logic [31:0] op_quotient_n; - logic [31:0] next_reminder; + logic [31:0] next_remainder; logic [32:0] next_quotient; logic [32:0] res_adder_h; logic mult_is_ready; @@ -107,7 +107,7 @@ module ibex_multdiv_fast ( mult_en_i: mac_res_q <= mac_res_n; div_en_i: - mac_res_q <= op_reminder_n; + mac_res_q <= op_remainder_n; default: mac_res_q <= mac_res_q; endcase @@ -128,15 +128,15 @@ module ibex_multdiv_fast ( assign res_adder_h = alu_adder_ext_i[33:1]; - assign next_reminder = is_greater_equal ? res_adder_h[31:0] : mac_res_q[31:0]; + assign next_remainder = is_greater_equal ? res_adder_h[31:0] : mac_res_q[31:0]; assign next_quotient = is_greater_equal ? {1'b0,op_quotient_q} | {1'b0,one_shift} : {1'b0,op_quotient_q}; assign one_shift = {31'b0, 1'b1} << div_counter_q; // The adder in the ALU computes alu_operand_a_o + alu_operand_b_o which means - // Reminder - Divisor. If Reminder - Divisor >= 0, is_greater_equal is equal to 1, - // the next Reminder is Reminder - Divisor contained in res_adder_h and the + // Remainder - Divisor. If Remainder - Divisor >= 0, is_greater_equal is equal to 1, + // the next Remainder is Remainder - Divisor contained in res_adder_h and the always_comb begin if ((mac_res_q[31] ^ op_denominator_q[31]) == 1'b0) begin is_greater_equal = (res_adder_h[31] == 1'b0); @@ -153,7 +153,7 @@ module ibex_multdiv_fast ( always_comb begin : div_fsm div_counter_n = div_counter_q - 5'h1; - op_reminder_n = mac_res_q; + op_remainder_n = mac_res_q; op_quotient_n = op_quotient_q; divcurr_state_n = divcurr_state_q; op_numerator_n = op_numerator_q; @@ -166,12 +166,12 @@ module ibex_multdiv_fast ( if (operator_i == MD_OP_DIV) begin // Check if the Denominator is 0 // quotient for division by 0 - op_reminder_n = '1; + op_remainder_n = '1; divcurr_state_n = equal_to_zero ? MD_FINISH : MD_ABS_A; end else begin // Check if the Denominator is 0 - // reminder for division by 0 - op_reminder_n = {2'b0, op_a_i}; + // remainder for division by 0 + op_remainder_n = {2'b0, op_a_i}; divcurr_state_n = equal_to_zero ? MD_FINISH : MD_ABS_A; end // 0 - B = 0 iff B == 0 @@ -193,8 +193,8 @@ module ibex_multdiv_fast ( end MD_ABS_B: begin - // reminder - op_reminder_n = { 33'h0, op_numerator_q[31]}; + // remainder + op_remainder_n = { 33'h0, op_numerator_q[31]}; // B abs value op_denominator_n = div_sign_b ? alu_adder_i : op_b_i; divcurr_state_n = MD_COMP; @@ -205,25 +205,25 @@ module ibex_multdiv_fast ( end MD_COMP: begin - op_reminder_n = {1'b0, next_reminder[31:0], op_numerator_q[div_counter_n]}; + op_remainder_n = {1'b0, next_remainder[31:0], op_numerator_q[div_counter_n]}; op_quotient_n = next_quotient[31:0]; divcurr_state_n = (div_counter_q == 5'd1) ? MD_LAST : MD_COMP; // Division - alu_operand_a_o = {mac_res_q[31:0], 1'b1}; // it contains the reminder + alu_operand_a_o = {mac_res_q[31:0], 1'b1}; // it contains the remainder alu_operand_b_o = {~op_denominator_q[31:0], 1'b1}; // -denominator two's compliment end MD_LAST: begin if (operator_i == MD_OP_DIV) begin - // this time we save the quotient in op_reminder_n (i.e. mac_res_q) since - // we do not need anymore the reminder - op_reminder_n = {1'b0, next_quotient}; + // this time we save the quotient in op_remainder_n (i.e. mac_res_q) since + // we do not need anymore the remainder + op_remainder_n = {1'b0, next_quotient}; end else begin - // this time we do not save the quotient anymore since we need only the reminder - op_reminder_n = {2'b0, next_reminder[31:0]}; + // this time we do not save the quotient anymore since we need only the remainder + op_remainder_n = {2'b0, next_remainder[31:0]}; end // Division - alu_operand_a_o = {mac_res_q[31:0], 1'b1}; // it contains the reminder + alu_operand_a_o = {mac_res_q[31:0], 1'b1}; // it contains the remainder alu_operand_b_o = {~op_denominator_q[31:0], 1'b1}; // -denominator two's compliment divcurr_state_n = MD_CHANGE_SIGN; @@ -232,11 +232,11 @@ module ibex_multdiv_fast ( MD_CHANGE_SIGN: begin divcurr_state_n = MD_FINISH; if (operator_i == MD_OP_DIV) begin - op_reminder_n = (div_change_sign) ? {2'h0,alu_adder_i} : mac_res_q; + op_remainder_n = (div_change_sign) ? {2'h0,alu_adder_i} : mac_res_q; end else begin - op_reminder_n = (rem_change_sign) ? {2'h0,alu_adder_i} : mac_res_q; + op_remainder_n = (rem_change_sign) ? {2'h0,alu_adder_i} : mac_res_q; end - // ABS(Quotient) = 0 - Quotient (or Reminder) + // ABS(Quotient) = 0 - Quotient (or Remainder) alu_operand_a_o = {32'h0 , 1'b1}; alu_operand_b_o = {~mac_res_q[31:0], 1'b1}; end