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Byte Offset	Name	Description	Note
0	Version[7:0]	Version number	Echoed back
1	OpCode[7:0]	Operation Code	Echoed back
2	TID[7:0]	Transaction ID	Echoed back
3	DevAddr[7:0]	Device Address	Echoed back
4	RegAddr[31:24]	Register Address	Echoed back
5	RegAddr[23:16]
6	RegAddr[15:8]
7	RegAddr[7:0]
8	MemData[31:24]	Memory Data	Only used for non-posted operations Either read or write data depending on OP-code value
9	MemData[23:16]
10	MemData[15:8]
11	MemData[7:0]
12	Respond[7:0]	Responds Value from Transaction	Only used for non-posted operations. non-zero if error BIT0 = Memory Transaction Responds BIT1 = Version Mismatch Error BIT2 = non 32-bit address alignment BIT3 = Framing Error BIT[7:4] = 0x0

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