NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 736 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
USB Asynchronous Schedule Sleep Timer Register (UASSTR)
Register
Offset
R/W
Description
Reset Value
UASSTR
0x03C R/W
USB Asynchronous Schedule Sleep Timer Register
0x0000_0BD6
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
ASTMR
7
6
5
4
3
2
1
0
ASTMR
Bits
Description
[31:11]
Reserved
Reserved.
[11:0]
ASSTMR
Asynchronous Schedule Sleep Timer
This field defines the AsyncSchedSleepTime of EHCI spec.
The asynchronous schedule sleep timer is used to control how often the host controller
fetches asynchronous schedule list from system memory while the asynchronous schedule
is empty.
The default value of this tim
er is 12’hBD6. Because this timer is implemented in UTMI clock
(30MHz) domain, the default sleeping time will be about 100us.