Driver Development Kit (DDK)

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what the structure of packet?

Hello everyone
   I am developing pci-7344`s driver under RTX.It says in the DDK that
command and data passed to or from the controller is handled in a
packet format. A packet consists of resourceID,commandID,data etc.Now I
know the information of resourceID,commandID,data etc.DDK or the
hardware user manual does not mention how to send them in a packet.
  Moreover The command buffer register is 16-bit.
  I try to send them one by one but it indicates "modal error" in the
csr.Since I have not programmed "error-handling" part of the driver ,so
I do not know what the error codes are.
 
Hope some advice on how to send the command packet? It is best if there
is an example !!
Thank you!!!
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