Isochronous (High-Speed) Transfer Descriptor (Itd); Asynchronous Schedule Organization - Intel IXP45X Developer's Manual

USB 2.0 Host Controller—Intel
Figure 46.

Asynchronous Schedule Organization

The Asynchronous list is a simple circular list of queue heads as shown in
(This figure is identical to
The ASYNCLISTADDR register is simply pointer to the next queue head. This
implements a pure round-robin service for all queue heads linked into the
asynchronous list.
9.13.3

Isochronous (High-Speed) Transfer Descriptor (iTD)

The format of an isochronous transfer descriptor is illustrated in
Transaction Descriptor (iTD)" on page
isochronous endpoints. All other transfer types should use queue structures.
Isochronous TDs must be aligned on a 32-byte boundary.
August 2006
Order Number: 306262--, Revision: 004US
® ®
IXP45X and Intel IXP46X Product Line of Network Processors
Operational Registers
ASYNCLISTADDR
Figure 39 on page
Intel
Bulk Control Queue Heads
H
357; it is duplicated here for convenience.)
392. This structure is used only for high-speed
® ®
IXP45X and Intel IXP46X Product Line of Network Processors
B4020-01
Figure 46.
"Isochronous
Developer's Manual
391