[AHB eVC]How to send transfers with no IDLE cycles

Hi, 

I want to send multiple SINGLE bursts with no intervals in between. like 2-2-2-2-2-2-2-2...

However, when I use the following source code, I got a couple of IDLE cycles like 2-2-0-2-2-2-0-2-0-2..., and I don't understand why. Can anybody help me?

(I am using non_blocking_write api, so there will be no 1 cycle loss between bursts.)

struct ahb_trans{

trans_type : vr_ahb_burst_kind;
trans_dir : vr_ahb_direction;
trans_size : vr_ahb_transfer_size;
trans_addr : vr_ahb_address;
trans_data : vr_ahb_data;

};

extend vr_ahb_master_seq_kind : [ MY_SEQ ];

extend MY_SEQ vr_ahb_master_seq {

!ahb_trans;

for i from 0 to 10 {

gen ahb_trans;

non_blocking_write( ahb_trans.trans_addr,
                                     {ahb_trans.trans_data},
                                      ahb_trans.trans_type,
                                      ahb_trans.trans_size);

};

};

* MY_SEQ will be used in MAIN sequence.

Appreciate any help.