參數(shù)資料
型號(hào)： μPD9210FGC-7EA
廠商： NEC Corp.
英文描述： USB Host Controller(USB主控制器)
中文描述： USB主機(jī)控制器（的USB主控制器）
文件頁(yè)數(shù)： 40/95頁(yè)
文件大小： 423K
代理商： ΜPD9210FGC-7EA
CHAPTER 3 DESCRIPTION OF USB HOST CONTROLLER FUNCTIONS
40
3.6 HC Mode Changes
HostControllerFunctionalState indicates which of the four states (modes) the HC is in: U
SB
O
PERATIONAL
, U
SB
R
ESET
,
U
SB
S
USPEND
, and U
SB
R
ESUME
. The HCD can change USB modes only as shown in Figure 3-12 and the HC can
execute only one change: from U
SB
S
USPEND
to U
SB
R
ESUME
during a remote wakeup event.
Figure 3-12. HC Mode Changes
U
SB
O
PERATIONAL
U
SB
S
USPEND
U
SB
R
ESUME
U
SB
R
ESET
U
SB
R
ESET
write
U
SB
O
PERATIONAL
write
U
SB
R
ESET
write
Hardware Reset
U
SB
R
ESET
write
U
SB
S
USPEND
write
U
SB
O
PERATIONAL
write
Software Reset
U
SB
R
ESUME
write
or
Remote Wakeup
When in U
SB
O
PERATIONAL
mode, the HC services lists and issues an SOF token. FrameInterval is loaded to
FrameRemaining at the same time as the mode is being changed to U
SB
O
PERATIONAL
.
The first SOF token to be sent after changing to U
SB
O
PERATIONAL
mode is sent at the frame boundary when
changing from FrameRemaining (value: “0”) to FrameInterval. At U
SB
R
ESET
, the HC forcibly sends a reset signal to
the bus. After a hardware reset, the HC always changes to U
SB
R
ESET
mode. When in U
SB
S
USPEND
mode, the USB is
temporarily stopped. When in this mode, the HC monitors the USB wakeup operations. The HC can forcibly change
to U
SB
R
ESUME
mode according to the remote wakeup condition. This change may conflict with the change to U
SB
R
ESET
mode that is performed by the HCD. When such a conflict has occurred, the HCD’s change to U
SB
R
ESET
mode takes
priority. A change to U
SB
R
ESUME
mode is not possible during the first 5 ms following a change to U
SB
S
USPEND
mode.
When in U
SB
R
ESUME
mode, the HC forcibly sends a resume signal to the bus. While in U
SB
R
ESUME
mode, the root hub
always passes a USB resume signal to downstream ports. The change to U
SB
R
ESUME
is started by a remote wakeup
signal sent by the HCD or the root hub.
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