Table 1—This is how the AX11005 sets up a packet for processing. All of the header information and the data payload can be easily accessed by with the AX11005 driver and API calls that are provided with the AX11005 development kit.

Offset address	Bit field	Field name	Size	Description
00h	bit[15:0]	NPR	2 bytes	Next pointer
02h	bit[11:0]	Length	12 bits	Packet length
	bit[14:12]	BPBB	3 bits	RX buffer used page number before REPP boundary (only valid when PCB =1)
	bit[15]	PCB	1 bit	Packet crossing boundary flag
04h	bit[7:0]	Data offset	1 byte	Data offset address of RX data payload
	bit[15:8]	Protocol	1 byte	Protocol type. It should be equal to the protocol field of the IP header for IP packets. It should be set to 0xFF for non-IP packets.
NPR	Length	BPBB	PCB	Data offset	Protocol	IP Header (for nontransparent)	Data payload
2bytes	12 bits	3 bits	1 bit	1 bytes	1 bytes	or Ethernet header (for transparent)