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Problem with bad CRC in CC2530 sniffer

Other Parts Discussed in Thread: CC2530

I try to make a raw IEEE.802.15.4 packet for CC2530 chip. Content of my packet follow:
0x00 0x00 0x00 0x00 0xA7 0x05 0x40 0x00 0x56 0x27 0x9E
There are a preamble (0x00 0x00 0x00 0x00), a SFD (0xA7), a frame length (0x05), a payload (0x40 0x00 0x56 ) and a 16-bit CRC (0x27 0x9E). This packet implement a physical layer of that protocol. The payload and appropriate CRC were taken from IEEE.802.15.4 standard as an example. For analyze I use the TI SmartRF Packet Sniffer in a Generic mode. I've got all my packets and their payload seems well, but the FCS checking always fail.

Could anybody explain me how to make good CRC for this packet? Unfortunately, it's impossible to look at the FCS that calculated by chip itself.