Global control and status register – Digi NS9750 User Manual
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U S B C o n t r o l l e r M o d u l e
Global Control and Status register
Address: 9010 0000
The Global Control and Status register contains all USB global and status information.
The USB can operate as a device or host, but cannot operate as both simultaneously
unless used in feedback mode. Feedback mode is useful for development and testing
only. The inactive block (host or device) is held in reset.
Register bit assignment
Bits
Access
Mnemonic
Reset
Description
D31:13
N/A
Not used
0x00000
Always read as 0.
D12
R
DISABLE
(DSABL)
0
Disable
0
Indicates that USB is enabled
1
Indicates that USB is disable
Indicates whether USB is disabled or enabled.
D11
R
HRST
1
Host reset
0
Indicates that the host block is enabled
1
Indicates that the host block is in reset
Provides the host block reset status.
D10:09
R
DRST
11
Device reset
00
Indicates that the device block is enabled
01
Indicates that the device block is in reset
Provides the device block reset status.
D08:06
N/A
Reserved
N/A
N/A
Table 417: Global Control and Status register
Not used
13
12
11
10
9
8
7
6
5
4
3
2
1
0
15
14
31
29
28
27
26
25
24
23
22
21
20
19
18
17
16
30
Not used
Not used
DSABL HRST
DRST
Reserved
SUSP
WKUP
Not
used
HST
DV