module cmi_decoder_h(cmi,clk,rst,nrz);
	input rst,clk,cmi;
	ouput nrz;
	reg nrz;
	reg t[3:0];
	d_ff d1(cmi,clk,t[0]);
	d_ff d2(cmi,~clk,t[1]);
	d_ff d3(t[1],clk,t[2]);
	xnor(t[3],t[0],t[2]);
	d_ff d3(t[3],~clk,nrz);
endmodule


module d_ff(d,clk,q);
 input clk,d;
 output q;
 reg q;
 always @ (posedge clk)
 q<=d;
endmodule