W90N745CD/W90N745CDG
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.
RESET
REGISTER
ADDRESS
R/W
DESCRIPTION
VALUE
R/W Host Controller Root Hub Descriptor B Register 0x0000_0000
HcRhDescriptorB 0xFFF0_504C
31
23
15
7
30
22
14
6
29
21
13
5
28
20
12
4
27
19
11
3
26
18
10
2
25
17
9
24
16
8
PPCM
PPCM
DEVRM
DEVRM
1
0
BITS
DESCRIPTION
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
[31:16] PPCM
Port Bit relationship - Unimplemented ports are reserved, read/write '0'.
0 : Reserved
1 : Port 1
2 : Port 2
...
15 : Port 15
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
[15:0]
DEVRM
2 : Port 2
...
15 : Port 15
Unimplemented ports are reserved, read/write '0'.
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