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|
`include "core/uarch.sv"
module core_control_mul
(
input logic clk,
rst_n,
input insn_decode dec,
input logic mul_ready,
input word rd_value_a,
rd_value_b,
input ctrl_cycle cycle,
next_cycle,
input logic issue,
output word mul_a,
mul_b,
mul_c_hi,
mul_c_lo,
output reg_num mul_r_add_hi,
mul_r_add_lo,
output logic mul,
mul_add,
mul_long,
mul_start,
mul_signed
);
word hold_a, hold_b;
assign {mul_c_hi, mul_c_lo} = {rd_value_a, rd_value_b};
assign {mul_a, mul_b} = mul_add ? {hold_a, hold_b} : {rd_value_a, rd_value_b};
always_ff @(posedge clk or negedge rst_n)
if(!rst_n) begin
mul <= 0;
mul_add <= 0;
mul_long <= 0;
mul_start <= 0;
mul_signed <= 0;
mul_r_add_hi <= {$bits(mul_r_add_hi){1'b0}};
mul_r_add_lo <= {$bits(mul_r_add_lo){1'b0}};
hold_a <= 0;
hold_b <= 0;
end else begin
mul_start <= 0;
unique case(next_cycle)
ISSUE: begin
mul <= issue && dec.ctrl.mul;
mul_add <= dec.mul.add;
mul_long <= dec.mul.long_mul;
mul_signed <= dec.mul.signed_mul;
mul_r_add_hi <= dec.mul.r_add_hi;
mul_r_add_lo <= dec.mul.r_add_lo;
end
MUL:
mul_start <= cycle != MUL;
MUL_ACC_LD: begin
hold_a <= rd_value_a;
hold_b <= rd_value_b;
end
endcase
end
//TODO: mul update_flags
endmodule
|
