Split Transaction Isochronous Transfer Descriptor (Sitd); Next Link Pointer; Split-Transaction Isochronous Transaction Descriptor (Sitd); Itd Buffer Pointer Page 2 (Plus) - Intel IXP45X Developer's Manual

USB 2.0 Host Controller—Intel
Table 148.

iTD Buffer Pointer Page 2 (Plus)

Bit
31:12
11:2
1:0
Table 149. iTD Buffer Pointer Page 3-6
Bit
31:12
11:0
9.13.4

Split Transaction Isochronous Transfer Descriptor (siTD)

All full-speed isochronous transfers through the internal transaction translator are
managed using the siTD data structure. This data structure satisfies the operational
requirements for managing the split transaction protocol.
Figure 48.

Split-transaction Isochronous Transaction Descriptor (siTD)

9.13.4.1

Next Link Pointer

DWord0 of a siTD is a pointer to the next schedule data structure.
August 2006
Order Number: 306262--, Revision: 004US
® ®
IXP45X and Intel IXP46X Product Line of Network Processors
Buffer Pointer. This is a 4K aligned pointer to physical memory. Corresponds to memory
address bits [31:12].
(Reserved). This bit reserved for future use and should be zero.
Multi. This field is used to indicate to the host controller the number of transactions that should
be executed per transaction description (e.g. per micro-frame). The valid values are:
Value Meaning
00b (Reserved). A zero in this field yields undefined results.
01b One transaction to be issued for this endpoint per micro-frame
10b Two transactions to be issued for this endpoint per micro-frame
11b Three transactions to be issued for this endpoint per micro- frame
Buffer Pointer. This is a 4K aligned pointer to physical memory. Corresponds to memory address
bits [31:12].
(Reserved). These bits reserved for future use and should be zero.
Description
Description
® ®
Intel IXP45X and Intel IXP46X Product Line of Network Processors
B4465-01
Developer's Manual
395