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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） |
| 文件頁數(shù)： | 55/95頁 |
| 文件大?。?/td> | 423K |
| 代理商： | ΜPD9210FGC-7EA |
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CHAPTER 4 POWER MANAGEMENT
55
4.4 Device State Transition Flow
To prevent faults in USB control operations from occurring due a transition between device states, such control
operations must follow a predetermined flow during a state transition. Make sure that such transitions comply with
the device state transition flow described in Table 4-4 below. Also, make sure that the HCD and System processing
comply with the OpenHCI specifications.
Table 4-4. State Control
Device State
USB State
State Transition Control
Suspend
→
Resume
Transition is only when RESUME signal is sent from USB
Flow A
Operational (bus master REQ)
Flow B
Operational (interrupt event)
Flow A
Operational (write to internal register)
Flow C
D0
(PCI = CLKRUN)
All other transitions
Normal HCD control
D2
Suspend
→
Resume
Flow D
D3
No transition
None
D0
→
D2
All transitions
Flow E
D0
→
D3
All transitions
Flow F
D2
→
D3
Reset, Suspend
Flow F
D2
→
D0
Reset, Suspend
Request from System Flow G
USB Wakeup request Flow D
D3
→
D0
Reset
Don’t care
Flow A
(a) Assert INTA
(b) Normal clock supply
(c) Interrupt servicing
(d) Deassert INTA
INTA output is synchronized to a 12-MHz clock and there is a delay of up to 170 ns between clearing of the status
register and clearing of INTA.
(HC)
(System)
(System)
(HC)
Flow B
(a) Assert CRUN (only when CLKRUN# is at high level)
(b) Normal clock supply
(c) Assert REQ
(d) PCI bus master operation
(e) Deassert REQ
(f)
Multiple Clock Continues operation using CRUN, when necessary
The maximum allowable time between assertion of CRUN and assertion of GNT to a device is 7
μ
s. This is a
restriction that applies to REQ for cases where data that includes at least 64 bytes is transferred via an
Isochronous Transaction. If more than 7
μ
s elapses before processing is started, some Isochronous data may be
lost during transfer. See the specifications of PCI Mobile Design Guide for CRUN operations.
(HC)
(System)
(HC)
(HC)
(HC)
(HC)
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