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參數(shù)資料
| 型號： | μPD9210FGC-7EA |
| 廠商： | NEC Corp. |
| 英文描述： | USB Host Controller(USB主控制器) |
| 中文描述： | USB主機控制器（的USB主控制器） |
| 文件頁數(shù)： | 46/95頁 |
| 文件大?。?/td> | 423K |
| 代理商： | ΜPD9210FGC-7EA |
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CHAPTER 3 DESCRIPTION OF USB HOST CONTROLLER FUNCTIONS
46
Figure 3-18. Input Emulation Flowchart for USB Keyboard/Mouse
S
oftware (HDC, BIOS,
Driver)
proceed
IR
Note 4
= 1:SMI
←
0
IR
Note 4
= 1:INTA
←
0
HceOutput
←
USB Date
OutputFull
←
1
Keyboard Date:AuxOutputFull
←
0
Mouse Date:Aux OutputFull
←
1
AOF
Note 6
= 0:IRO1
←
1
AOF
Note 6
= 1:IRO2
←
1
IR
Note 4
= 1:SMI
←
0
IR
Note 4
= 0:INTA
←
0
I/O
60h Access Intercept
AD
←
HceOutput
OutputFull
←
0
IRO1
←
0, IRO2
←
0
Emulation for
USB Keyboard/mouse
I/O 60h Read
IRQEn = 1&
OutputFull = 1
FINISHED
Emulation Done
FINISHED
MA
Note 1
= 1
& OF
Note 2
= 0&
CP
Note 3
= 1
Done Queue Process
WritebackDoneHead
Interrupt
NO
YES
YES
TD for USB Keyboard/mouse
Done without Error
Notes 1.
MA = PCI Command Reg. Memory Access
2.
OF = OutputFull
3.
CP = CharacterPending (set by system software)
4.
IR = InterruptRouting
5.
The WritebackDoneHead interrupt is generated at the same time as the emulation interrupt. The
system software acknowledges these interrupts and must clear both of them.
6.
AOF = AuxOutputFull
When the system software detects the emulation interrupt, the transferred data is written to HceOutput Reg.
(108h) via a memory write operation and “1” is set to the OutputFull field. In addition, “0” is set to HceStatus’s
AuxOutputFull field if the data is keyboard data and “1” is set to that field if the data is mouse data. At that point, the
system software performs operations such as deleting the contents of the TD’s DoneQueue field or canceling
interrupts. This setting asserts IRO1 (IRQ1) if for keyboard data or IRO2 (IRQ12) if for mouse data. In cases where
assertion of the IRO1 or IRO2 signal causes the software to perform I/O read access to address 60h, the HC
intercepts this access and outputs the HceOutput value to the data bus instead of the keyboard controller. Next, “0”
is set to the OutputFull field, and IRO1 or IRO2 is deasserted. By performing this series of operations, the software is
able to handle USB keyboard/mouse data in the same way as legacy keyboard/mouse data.
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