Typedef req_t

typedef struct packed {                                       
    aw_chan_t aw;                                       
    logic     aw_valid;                                 
    w_chan_t  w;                                        
    logic     w_valid;                                  
    logic     b_ready;                                  
    ar_chan_t ar;                                       
    logic     ar_valid;                                 
    logic     r_ready;                                  
  } req_t;