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;