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NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 764 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
Host Controller Root Hub Descriptor A Register (HcRhDeA)
Register
Offset
R/W
Description
Reset Value
HcRhDeA
0x048
R/W
Host Controller Root Hub Descriptor A Register
0x0100_0002
31
30
29
28
27
26
25
24
POTPGT
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
Reserved
NOCP
OCPM
DT
NPS
PSM
7
6
5
4
3
2
1
0
NDP
Bits
Description
[31:24]
POTPGT
Power on to Power Good Time
This field value is represented as the number of 2 ms intervals, which ensuring that the
power switching is effective within 2 ms. Only bits [25:24] are implemented as R/W. The
remaining bits are read only as ‘0’. It is not expected that these bits be written to anything
other than 1h, but limited adjustment is provided. This field should be written to support
system implementation. This field should always be written to a non-zero value.
[23:13]
Reserved
Reserved.
[12]
NOCP
No over Current Protection
Global over-current reporting implemented in HYDRA-2. This bit should be written to
support the external system port over-current implementation.
0 = Over-current status is reported.
1 = Over-current status is not reported.
[11]
OCPM
Over Current Protection Mode
Global over-current reporting implemented in HYDRA-2. This bit should be written 0 and is
only valid when NoOverCurrentProtection is cleared.
0 = Global Over-Current.
1 = Individual Over-Current.
[10]
DT
Device Type
-4is not a compound device.
[9]
NPS
No Power Switching
Global power switching implemented in HYDRA-2. This bit should be written to support the
external system port power switching implementation.
0 = Ports are power switched.
1 = Ports are always powered on.