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Table 18.7
Dword1 ITD Fields
Bit Range
Field
31 - 12
BufferPage0 (BP0)
•
Load Condition
Dword1 is loaded with pci_Data[31:0] when LoadDescriptorDword[1] is asserted.
•
Update Condition
Dword1 is updated with the new CBP only for a GTD when the
fm_TransactionServiced and UpdateTD are asserted, and the completion code is
DataOverrun, DataUnderrrun, or NoError.
c) Dword2
Dword2 contains the address of the next TD in the linked list.
•
Fields
Table 18.8
Dword2 Fields
Bit Range
Field
31 - 4
NextTD
•
Load Condition
Dword2 is loaded with pci_Data[31:4] when LoadDescriptorDword[2] is asserted.
•
Update Condition
Dword2 is updated with the current value of the DoneHead pointer when the TD is
retired.
d) Dword3
Dword3 contains the value of the last byte of the data packet.
•
Fields
Table 18.9
Dword3 GTD Fields
Bit Range
Field
31 - 12
BufferEndPage (BEPage)
11 - 0
BEOffset
Table 18.10 Dword3 ITD Fields
Bit Range
Field
31 - 12
BufferEndPage (BEPage)
11 - 0
BEOffset / Offset1
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