Cross coverage with automatic bins and random constraints

SystemVerilog
,
1

Hi all, can someone suggest a better way to write the field “ignore_bins” in this case?
Otherwise does someone know if there is a way to do a cross coverage with automatic cross bins that respects also the constraints? I mean without defining the ignore_bins.
Thanks in advance.

class pl_txn;
		
	typedef struct packed {
		reg[7:0] ttag;   	// tag to be triggered
		reg[3:0] ttype;   // type to be triggered
		reg[3:0] op_type;
		} rnd_var_struct;
		
	randc rnd_var_struct rnd_var;
		
	constraint rnd_constr { (rnd_var.op_type inside {[4'h2:4'h4]}) -> (rnd_var.ttag inside {8'h1,8'h4,8'h7});
						    (rnd_var.op_type inside {[4'h0:4'h1]}) -> (rnd_var.ttag == 8'h1);
						    rnd_var.op_type inside {[4'h0:4'h4]};
						    rnd_var.ttag inside {[8'h1:8'h7]};
						    rnd_var.ttype inside {[4'h1:4'h6]};	}
							
	covergroup pl_cg;
		// option.cross_auto_bin_max = 0;
		TAG: coverpoint rnd_var.ttag {
			bins one = {8'h1};
			bins four = {8'h4};
			bins seven = {8'h7};
			bins others = default;
			}
		TYPE: coverpoint rnd_var.ttype {
			bins cp_cmd 	= {4'b0001};
			bins cp_dataout = {4'b0010};
			bins cp_rtt 	= {4'b0011};
			bins cp_datain 	= {4'b0100};
			bins cp_rsp		= {4'b0101};
			bins cp_tgpio 	= {4'b0110};
			}
		OP_TYPE: coverpoint rnd_var.op_type {
			bins cp_gpio_l 	= {4'h0};	//lower 4 clock cycles
			bins cp_gpio_u 	= {4'h1};	//upper 4 clock cycles
			bins cp_write 	= {4'h2};
			bins cp_read 	= {4'h3};
			bins cp_query 	= {4'h4};
			}
 		CROSS: cross OP_TYPE, TYPE, TAG {
			ignore_bins i1 = (binsof(OP_TYPE.cp_gpio_l) || binsof(OP_TYPE.cp_gpio_u)) && (binsof (TAG.four) 
                                          || binsof (TAG.seven)) && (binsof (TYPE.cp_cmd) || binsof (TYPE.cp_dataout) 
                                          || binsof (TYPE.cp_rtt) || binsof (TYPE.cp_datain)
                                          || binsof (TYPE.cp_rsp) || binsof (TYPE.cp_tgpio));
			}
	endgroup
	
	function new();
		pl_cg = new();
	endfunction
		

endclass: pl_txn