仿真显示状态机ascii

enum logic [3:0] {IDLE=4’d0,STEP1=4’d1,STEP2=4’d2} cur_sta,next_sta;

定义结构体

typedef struct packed{
reg [5:0]   a  ;
reg [5:0]   b  ;
}   spi_cmd    ;
logic    [3:0]  [$bits(spi_cmd )-1:0]   data   ;
spi_cmd  [3:0]                          data   ;