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參數(shù)資料
| 型號： | UPD72012 |
| 廠商： | NEC Corp. |
| 英文描述： | HUB CONTROLLER FOR UNIVERSAL SERIAL BUS |
| 中文描述： | 集線器控制器通用串行總線 |
| 文件頁數(shù)： | 20/36頁 |
| 文件大小： | 414K |
| 代理商： | UPD72012 |
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20
Data Sheet S13918EJ3V0DS
μ
PD72012
(4/4)
Value
Standard ROM code
product
No.
Field
Size
(Bytes)
Contents
003
004
Mask
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, if a non-removable device is connected to
a downstream port of the HUB, bit 2 of
wHubCharacteristics field should be set to “1”.
When the number of ports that can be port enabled
is limited by the PVSEL pin setting or Mask 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
8
bPortPwrCtrlMask
1
This field exists for reasons of compatibility with
software written for 1.0 compliant devices. All bits in
this field should be set to 1B.
0xFF
0xFF
0xFF
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