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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)： | 48/95頁 |
| 文件大?。?/td> | 423K |
| 代理商： | ΜPD9210FGC-7EA |
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CHAPTER 3 DESCRIPTION OF USB HOST CONTROLLER FUNCTIONS
48
Figure 3-20 shows a legacy operation flowchart for output operations. When EmulationEnable is “0”, only legacy
keyboard or mouse devices are valid. Consequently, the HC does not receive I/O access and write operations to I/O
address 60h/64h are performed directly from the keyboard controller. When EmulationEnable is “1”, the HC
intercepts the write operation to I/O address 60h/64h and writes the data to HceInput, then sets “1” to HceStatus’s
InputFull field. In addition, it sets “0” to HceStatus’s CmdData field when data is written to 60h, and it sets “1” to that
field when data is written to 64h. Once the HC confirms that “1” has been set to MemoryAccess, InputFull, and
EmulationEnable, it generates an emulation interrupt. When writing to a USB keyboard or mouse, the system
software reads from HceInput upon detecting the emulation interrupt, and then sets “0” to InputFull. Next, the system
software generates data in the TD and USB formats, based on the data that was read, and processes this data via
ordinary USB operations. Meanwhile, when writing to a legacy keyboard or mouse, the system software not only
reads HceInput and sets “0” to InputFull, it also sets “0” to EmulationEnable. Since setting “0” to EmulationEnable
means that the HC no longer receives I/O access, writing to I/O address 60h or 64h is performed by writing directly to
the keyboard controller. The value of CmdData is checked to determine whether output is to I/O address 60h or 64h.
If a GateA20 sequence occurs, it takes priority over the operations described above.
Figure 3-20. Output-related Legacy Operation Flowchart
IR
Note 2
= 1:SMI
←
0
IR
Note 2
= 0:INTA
←
0
I/O Access to HC
Disable
I/O Access to HC
Enable
HceInput
←
AD
InputFull
←
1
Emulation for
USB Keyboard/mouse
Emulation for
Legacy Keyboard/mouse
Legacy support
OUTPUT
Write to I/O 60h/64h
Write to I/O 60h/64h
GateA20 Sequence
MA
Note 1
= 1&
InputFull = 1
EmulationEnable
= 1
Data to keyboard Controller
FINISHED
GateA20 Sequence
Write to I/O 60h:
CmdData
←
0
Write to I/O 64h:
CmdData
←
1
YES
NO
YES
YES
NO
NO
S
oftware (HDC, BIOS,
Driver)
proceed
Notes 1.
MA = PCI Command Reg. Memory Access
2.
IR = InterruptRouting
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