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)： 53/95頁(yè)
文件大小： 423K
代理商： ΜPD9210FGC-7EA
CHAPTER 4 POWER MANAGEMENT
53
4.3 Transition Conditions for Bus States and Device States
The following conditions must be met for a device state transition to occur.
Table 4-1. Device State Transition Conditions
State Transition
Transition Condition
Transition Request Source
D0
→
D2
Register setting specifies USB = USB_RESET or SUSPEND state
System
D0
→
D3
Register setting specifies USB = USB_RESET state and device's power is
off or a HW_RESET occurs
System
D2
→
D0
Register setting
System,
USB_Wakeup
D3
→
D0
Register setting
System
D2
→
D3
Register setting specifies USB = USB_RESET state and device's power is
off or a HW_RESET occurs
System
USB state transitions are defined in the USB specifications. The transition conditions are listed below.
Table 4-2. USB State Transition Conditions
Transition Condition
State Transition
Operational Register
Setting
H/W_Reset
S/W_Reset
Wakeup
Request
Attach
Detection
Dettach
Detection
Operational
→
Reset
{
{
×
×
×
×
Suspend
→
Reset
{
{
×
×
×
×
Resume
→
Reset
{
{
×
×
×
×
Reset
→
Operational
{
×
×
×
×
×
Operational
→
Suspend
{
×
{
×
×
×
Suspend
→
Operational
{
×
×
×
×
×
Suspend
→
Resume
{
×
×
{
{
{
Resume
→
Operational
{
×
×
×
×
×
Reset
→
Suspend
×
×
{
×
×
×
Resume
→
Suspend
×
×
{
×
×
×
Remark
Wakeup: Wakeup request from USB device
The mutual relation between the device and the external (USB or PCI) interface is determined as follows,
according to the previously described relations between the PCI bus and the device state as well as the device/USB
state transition information.
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