Rev. 3.0, 03/01, page 282 of 390
a) Dword0
Dword0 contains the status information for the Transfer Descriptor.
•
Field
Table 18.4
Dword0 GTD Fields
Bit Range
Field
31 - 28
CompletionCode
27 - 26
ErrorCount
25 - 24
DataToggle
23 - 21
DelayInterrupt
20 - 19
Direction
18
BufferRounding
Table 18.5
Dword0 ITD Fields
Bit Range
Field
31 - 28
CompletionCode
26 - 24
FrameCount
23 - 21
DelayInterrupt
15 - 0
StartingFrame
•
Load Condition
Dword0 is loaded with pci_Data[31:0] when LoadDescriptorDword[0] is asserted.
•
Update Condition
Dword0 is updated when the TD has been serviced (fm_TransactionServiced) and is
being written back to memory (UpdateTD).
The updated fields for GTD are CompletionCode, ErrorCount, and DataToggle.
The updated field for ITD is CompletionCode.
b) Dword1
Dword1 contains the current buffer pointer (CBP) for a GTD, and the buffer page 0 for an
ITD.
•
Fields
Table 18.6
Dword1 GTD Fields
Bit Range
Field
31 - 12
CBPage
11 - 0
CBPOffset
Summary of Contents for HD64465
Page 25: ...Rev 3 0 03 01 page 6 of 390 ...
Page 59: ...Rev 3 0 03 01 page 40 of 390 ...
Page 97: ...Rev 3 0 03 01 page 78 of 390 ...
Page 147: ...Rev 3 0 03 01 page 128 of 390 ...
Page 199: ...Rev 3 0 03 01 page 180 of 390 ...
Page 247: ...Rev 3 0 03 01 page 228 of 390 ...
Page 385: ...Rev 3 0 03 01 page 366 of 390 ...
Page 389: ...Rev 3 0 03 01 page 370 of 390 ...
Page 409: ...Rev 3 0 03 01 page 390 of 390 ...