Rev. 3.0, 03/01, page 263 of 390
USB RESUME
When in the U
SB
R
ESUME
state, the Host Controller forces resume signaling on the bus. While in
U
SB
R
ESUME
, the Root Hub is responsible for propagating the USB Resume signal to downstream
ports as specified in the USB Specification. The Host Controller's list processing and SOF Token
generation are disabled while in U
SB
R
ESUME
. In addition, the FrameNumber field of
HcFmNumber does not increment while the Host Controller is in the U
SB
R
ESUME
state.
U
SB
R
ESUME
is only entered from U
SB
S
USPEND
. The transition to U
SB
R
ESUME
can be initiated by
the Host Controller Driver or by a USB remote wakeup signaled by the Root Hub. The Host
Controller is responsible for resolving state transition conflicts between the hardware wakeup and
Host Controller Driver initiated state transitions. Legal state transitions from U
SB
R
ESUME
are to
U
SB
R
ESET
and to U
SB
O
PERATIONAL
.
The Host Controller Driver is responsible for USB Resume signal timing as defined by the USB
Specification.
List Processing
The List Processor consists of four main blocks. The four blocks are the List Control block, the ED
block, the TD block, and the Request block. The first three blocks operate in a lock step fashion
with the List Control block triggering the ED block, which in turn triggers the TD block. These
blocks are responsible for issuing their own bus master requests to the Request block which
interfaces to the Host Controller Bus Master.
Summary of Contents for HD64465
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