
NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 747 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
Host Controller Command Status Register (HcComSts)
Register
Offset
R/W
Description
Reset Value
HcComSts
0x008
R/W
Host Controller Command Status Register
0x0000_0000
31
30
29
28
27
26
25
24
Reserved
23
22
21
20
19
18
17
16
Reserved
SOC
15
14
13
12
11
10
9
8
Reserved
7
6
5
4
3
2
1
0
Reserved
OCR
BLF
CLF
HCR
Bits
Description
[31:18]
Reserved
Reserved.
[17:16]
SOC
Schedule Overrun Count
This field is increment every time the SchedulingOverrun bit in HcInterruptStatus is set.
The count wraps from ‘11’ to ‘00.’
[15:4]
Reserved
Reserved.
[3]
OCR
Ownership Chang Request
When set by software, this bit sets the OwnershipChange field in HcInterruptStatus. The
bit is cleared by software.
[2]
BLF
Bulk List Filled
Set to indicate there is an active ED on the Bulk List. The bit may be set by either
software or the Host Controller and cleared by the Host Controller each time it begins
processing the head of the Bulk List.
[1]
CLF
Control List Filled
Set to indicate there is an active ED on the Control List. It may be set by either software
or the Host Controller and cleared by the Host Controller each time it begins processing
the head of the Control List.
[0]
HCR
Host Controller Reset
This bit is set to initiate the software reset. This bit is cleared by the Host Controller, upon
completed of the reset operation.