case(store_funct3)
                sb: begin
                    mem_data_out_mux_sel = 2;
                    case(mem_address[1:0])
                        0: begin
                            mem_byte_enable = 4'b0001;
                        end
                        1: begin
                            mem_byte_enable = 4'b0010;
                        end
                        2: begin
                            mem_byte_enable = 4'b0100;
                        end
                        3: begin
                            mem_byte_enable = 4'b1000;
                        end
                        default: ;
                    endcase
                end
                sh: begin
                    mem_data_out_mux_sel = 1;
                    case(mem_address[1])
                        0: begin
                            mem_byte_enable = 4'b0011;
                        end
                        1: begin
                            mem_byte_enable = 4'b1100;
                        end
                        default: ;
                    endcase
                end
                sw: begin
                    mem_byte_enable = 4'b1111;
                    mem_data_out_mux_sel = 0;
                end
                default: ; //nothing
            endcase