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changes.mady.by.user Larry Ruckman

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changes.mady.by.user Sandberg, Hampus

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Byte OffsetNameDescriptionNote
0Header[7:0]
  • Version number
  • Operation Type
  • Device Address
  • Version number = Echoed back
  • Operation Type = Echoed back
  • Device Address:
    • if 0x0 = Echoed back
    • Else decremented by 1 from request's device address
1RegAddr[31:24]Register AddressEchoed back
2RegAddr[23:16]
3RegAddr[15:8]
4RegAddr[7:0]
5MemData[31:24]Memory Data
  • Returns the read data if read operation
  • Returns the write data if write operation


6MemData[23:16]
7MemData[15:8]
8MemData[7:0]
9Footer[7:0]Responds  Value

Only used for non-posted operations.  non-zero if error

  • BIT[1:0] = Memory Transaction Responds
  • BIT2 = Version Mismatch Error
  • BIT3 = non 32-bit address alignment
  • BIT4 = checksum error
  • BIT[7:5] = 0x0


10Checksum[7:0]Checksum
  • Calculated from all data payload bytes
  • ByteOffset[9:0]
  • One's complement


References