| module example; |
| |
| reg [7:0] vec; |
| reg [3:0] ix; |
| wire vix = vec[ix]; |
| |
| initial begin |
| $display( " time ix vix vec" ); |
| $display( " ---- ---- --- --------" ); |
| $monitor( "%T %b %b %b", $time, ix, vix, vec ); |
| vec = 8'b00000000; |
| ix = 0; // 0 |
| #100 ix = 1; // 100 |
| #100 ix = 2; // 200 |
| #100 ix = 3; // 300 |
| #100 ix = 4; // 400 |
| #100 ix = 5; // 500 |
| #100 ix = 6; // 600 |
| #100 ix = 7; // 700 |
| #100 ix = 8; // 800 |
| #100 ix = 4'b001x; // 900 |
| #100 ix = 4'b01x0; // 1000 |
| #100 ix = 4'b0x01; // 1100 |
| #100 ix = 0; // 1200 |
| #100 vec[ix] = 1'b1; // 1300 |
| #100 vec[ix] = 1'b0; // 1400 |
| #100 ix = 3; // 1500 |
| #100 vec[ix] = 1'b1; // 1600 |
| #100 vec[ix] = 1'b0; // 1700 |
| #100 ix = 6; // 1800 |
| #100 vec[ix] = 1'b1; // 1900 |
| #100 vec[ix] = 1'b0; // 2000 |
| #100 ix = 8; // 2100 |
| #100 vec[ix] = 1'b1; // 2200 |
| #100 vec[ix] = 1'b0; // 2300 |
| #100 ix = 4'b010x; // 2400 |
| #100 vec[ix] = 1'b1; // 2500 |
| #100 vec[ix] = 1'b0; // 2600 |
| #100 ix = 4'b00x1; // 2700 |
| #100 vec[ix] = 1'b1; // 2800 |
| #100 vec[ix] = 1'b0; // 2900 |
| #100 ix = 4'b0x10; // 3000 |
| #100 vec[ix] = 1'b1; // 3100 |
| #100 vec[ix] = 1'b0; // 3200 |
| #100 ix = 4'bxxxx; // 3300 |
| #100 vec[ix] = 1'b1; // 3400 |
| #100 vec[ix] = 1'b0; // 3500 |
| #100 $display( "Finish at time %T", $time ); |
| end |
| |
| endmodule |
