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CC2480 doesn't drive SRDY low when packets received

Hi

We use CC2480 to set up one zigbee wirless network and exchange data between devices.  

Now it seems the networking function is working and ok, the routers and enddevices can get the short address from coordinator correctly. 

But when the end-divce or one router send messages to the coorindator with 0x0000 short address, or broadcast the message packets in the zigbee network, the coordinator does not drive the SRDY low after received the packet. when we use the sniffer to monitor the traffic, the sniffer can catch the sent message packets and the ACK message packets. But the coordinator does not drive the SRDY to low.

we checked the start request command, and the start request comfirm message can be sent out by cc2480 correctly after host MCU sent out the start request command message to cc2480 through SPI interface.

anybody met the same situation ? any one can give me one suggestion ?

thanks a lot

Peter