module instr_decode(
    input    [23: 0]    instruction ,//指令
    output   [7: 0]     opcode      ,//操作码
    output   [7: 0]     slave_id    ,//电路id
    output   [7: 0]     data         //数据
 );

 assign slave_id = instruction[23:16];
 assign opcode   = instruction[15: 8];
 assign data     = instruction[7: 0];

endmodule