NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 748 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
Host Controller Interrupt Status Register (HcIntSts)
Register
Offset
R/W
Description
Reset Value
HcIntSts
0x00C
R/W
Host Controller Interrupt Status Register
0x0000_0000
31
30
29
28
27
26
25
24
Reserved
OC
Reserved
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
Reserved
7
6
5
4
3
2
1
0
Reserved
RHSC
FNO
UE
RD
SF
WDH
SO
Bits
Description
[31]
Reserved
Reserved.
[30]
OC
Ownership Change
This bit is set when the OwnershipChangeRequest bit of HcCommandStatus is set.
[29:7]
Reserved
Reserved.
[6]
RHSC
Root Hub Status Change
This bit is set when the content of HcRhStatus or the content of any HcRhPortStatus
register has changed.
[5]
FNO
Frame Number Overflow
Set when bit 15 of HcFNum changes value.
[4]
UE
Unrecoverable Error
This event is not implemented and is hard-
coded to ‘0.’ Writes are ignored.
[3]
RD
Resume Detected
Set when Host Controller detects resume signaling on a downstream port.
[2]
SF
Start of Frame
Set when the Frame Management block si
gnals a ‘Start of Frame’ event.
[1]
WDH
Write Back Done Head
Set after the Host Controller has written HcDoneHead to HccaDoneHead.
[0]
SO
Scheduling Overrun
Set when the List Processor determines a Schedule Overrun has occurred.