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參數(shù)資料
| 型號(hào)： | μPD72012 |
| 廠商： | NEC Corp. |
| 英文描述： | Hub Controller For USB(集線器控制器) |
| 中文描述： | 集線器控制器的USB（集線器控制器） |
| 文件頁數(shù)： | 20/40頁 |
| 文件大?。?/td> | 342K |
| 代理商： | ΜPD72012 |
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20
Preliminary Data Sheet S13918EJ2V0DS00
μ
PD72012
(4/5)
Value
Standard ROM code
product
No.
Field
Size
(Bytes)
Contents
003
004
User ROM
code
product
7
bDeviceRemovable
1
Uses a bitmap to show whether or not removable
devices are connected to HUB ports.
“1” shows that the connected device is non-
removable, and “0” shows that it is removable. Set
“1” if a port that is used cannot be connected nor
disconnected using an external circuit.
Note that, according to the USB standard, if a non-
removable device is connected to a downstream port
of the HUB, the host may define the system
containing the HUB as a composite device.
When the number of ports that can be port enabled
is limited by the PVSEL pin setting or User ROM
code product settings, set “0” for all ports that are
not port enabled. The meaning of the bitmap is as
follows.
Bit 0:
Bit 1:
Always set to “0”.
If “1”, the device connected to port 1 is
non-removable.
If “1”, the device connected to port 2 is
non-removable.
If “1”, the device connected to port 3 is
non-removable.
If “1”, the device connected to port 4 is
non-removable.
If “1”, the device connected to port 5 is
non-removable.
Bits 7,6: Always set to “0”.
Bit 2:
Bit 3:
Bit 4:
Bit 5:
For a standard ROM code product (003, 004), all
ports are removable.
0x00
0x00
0xXX
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