20'd0: instruction <= 32'h3c104000; // lui     $s0,    0x4000
20'd1: instruction <= 32'h20110001; // addi    $s1,    $zero,  1
20'd2: instruction <= 32'hae110000; // sw      $s1,    0($s0)
20'd3: instruction <= 32'h8e120000; // lw      $s2,    0($s0)
20'd4: instruction <= 32'hae120004; // sw      $s2,    4($s0)