TDO is driven on th rising edge of tck

[omerguzelelectronicguy]

riscv-dbg/src/dmi_jtag_tap.sv

Lines 202 to 211 in 618ee6e

	// TDO changes state at negative edge of TCK
	always_ff @(posedge tck_n, negedge trst_ni) begin : p_tdo_regs
	if (!trst_ni) begin
	td_o <= 1'b0;
	tdo_oe_o <= 1'b0;
	end else begin
	td_o <= tdo_mux;
	tdo_oe_o <= (shift_ir | shift_dr);
	end
	end

As I understand the jtag standarts tells that tdo should be driven in the falling edge of the tck. It is also left as comment in the code section above. However, It is driven in the rising edge. Did I misunderstand the standart? What am I missing? Or Is this just a small bug in the code?

[omerguzelelectronicguy]

I missed that it is driven in posedge of tck_n which is negedge of tck.