RS Latch for DE2-70 Board

`timescale 1ns/100ps
module RSFF (SW, LEDR, LEDG);
input [17:0] SW; // toggle switches
output [17:0] LEDR; // red LEDs
output [7:0] LEDG; // green LEDs


wire s,r;
wire q,q_b;

    
assign LEDR = SW;
assign s = SW[0];
assign r = SW[1];

nor #(4) 
     g1 ( q_b, s, q ),
     g2 ( q, r, q_b );
     
assign LEDG[0]=q;
assign LEDG[1]=q_b;

endmodule

/*
module RSFF (input s, r, output q, q_b );
    nor #(4) 
     g1 ( q_b, s, q ),
     g2 ( q, r, q_b );
endmodule
*/