Rainbow Electronics W90P710CDG User Manual
Page 189
W90P710CD/W90P710CDG
Publication Release Date: September 19, 2006
- 189 -
Revision B2
Host Controller Root Hub Descriptor B Register
This register is only reset by a power-on reset. It is written during system initialization to configure the
Root Hub. These bits should not be written during normal operation.
REGISTER ADDRESS
R/W
DESCRIPTION
RESET
VALUE
HcRhDescriptorB 0xFFF0_504C
R/W Host Controller Root Hub Descriptor B Register 0x0000_0000
31
30
29
28
27
26
25
24
PPCM
23
22
21
20
19
18
17
16
PPCM
15
14
13
12
11
10
9
8
DEVRM
7
6
5
4
3
2
1
0
DEVRM
BITS
DESCRIPTION
[31:16] PPCM
PortPowerControlMask
Global-power switching. This field is only valid if NoPowerSwitching is
cleared and PowerSwitchingMode is set (individual port switching). When
set, the port only responds to individual port power switching commands
(Set/ClearPortPower). When cleared, the port only responds to global power
switching commands (Set/ClearGlobalPower).
0 = Device not removable
1 = Global-power mask
Port Bit relationship - Unimplemented ports are reserved, read/write '0'.
0 : Reserved
1 : Port 1
2 : Port 2
...
15 : Port 15
[15:0] DEVRM
DeviceRemoveable
table of none-4 ports default to removable devices.
0 = Device not removable
1 = Device removable
Port Bit relationship
0 : Reserved
1 : Port 1
2 : Port 2
...
15 : Port 15
Unimplemented ports are reserved, read/write '0'.