Isochronous Transfer Descriptor Format. 4 2 2 3 1 2 0 1 6 1 1 5 2 1 0 1 5 0 0 4 0 CC – FC DI — SF Buffer Page 0 (BP0) — Offset1/PSW1 Offset0/PSW0 Offset3/PSW3 Offset2/PSW2 Offset5/PSW5 Offset4/PSW4 Offset7/PSW7 Offset6/PSW6 Dword 0 Dword 1 Dword 2 Dword 3 Dword 4 Dword 5 Dword 6 Dword 7 SF R StartingFrame This field contains the low order 16 bits of the frame number in which the first data packet of the Isochronous TD is to be sent. DI R DelayInterrupt This field contains the interrupt delay for this Isochronous TD. FC R FrameCount Number of data packets (frames) of data described by this Isochronous TD. FrameCount = 0 implies 1 data packet and FrameCount = 7 implies 8. CC R/W ConditionCode This field contains the completion code when the Isochronous TD is moved to the Done Queue (see Section 0.) BP0 R BufferPage0 The physical page number of the first byte of the data buffer used by this Isochronous TD NextTD R/W NextTD This entry points to the next Isochronous TD on the queue of Isochronous TDs linked to an ED BE R BufferEnd Contains the physical address of the last byte in the buffer. OffsetN R Offset Used to determine size and starting address of an isochronous data packet. PSWN W PacketStatusWord Contains completion code and, if applicable, size received for an isochronous data packet (details in Section 4.3.2.4.)
Appears in 2 contracts
Sources: Adopter’s Agreement for Open Host Controller Interface Reciprocal Covenant, Adopter’s Agreement for Open Host Controller Interface Reciprocal Covenant