NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 770 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
USB Operational Mode Enable Register (OpModEn)
Register
Offset
R/W
Description
Reset Value
OpModEn
0x204
R/W
USB Operational Mode Enable Register
0X0000_0000
31
30
29
28
27
26
25
24
Reserved
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
Reserved
SIEPD
7
6
5
4
3
2
1
0
Reserved
OCAL
Reserved
ABORT
DBR16
Bits
Description
[31:9]
Reserved
Reserved.
[8]
SIEPD
SIE Pipeline Disable
When set, waits for all USB bus activity to complete prior to returning completion status to
the List Processor. This is a failsafe mechanism to avoid potential problems with the clk_dr
transition between 1.5 MHz and 12 MHz.
[7:4]
Reserved
Reserved.
[3]
OCAL
Over Current Active Low
This bit controls the polarity of over current flag from external power IC.
0 = Over current flag is high active.
1 = Over current flag is low active.
[2]
Reserved
Reserved.
[1]
ABORT
AHB Bus ERROR Response
This bit indicates there is an ERROR response received in AHB bus.
0 = No ERROR response received.
1 = ERROR response received.
[0]
DBR16
Data Buffer Region 16
When set, the size of the data buffer region is 16 bytes. Otherwise, the size is 32 bytes.