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NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 766 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
Host Controller Root Hub Descriptor B Register (HcRhDeB)
Register
Offset
R/W
Description
Reset Value
HcRhDeB
0x04C
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
DevRemove
7
6
5
4
3
2
1
0
DR
Bits
Description
[31:16]
PPCM
Port Power Control Mask
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 mas..k
Port Bit relationship - Unimplemented ports are reserved, read/write '0'.
0 : Reserved
1 : Port 1
2 : Port 2
15 : Port 15
[15:0]
DR
Device Removable
NUC970 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'.