Hcrhstatus register – Digi NS9750 User Manual
Page 780
U S B h o s t b l o c k r e g i s t e r s
7 5 6
N S 9 7 5 0 H a r d w a r e R e f e r e n c e
HcRhStatus register
Address: 9010 1050
The HcRhStatus register has two parts:
The lower word of a Dword represents the hub status field.
The upper word of the Dword represents the hub status change field.
Register bit assignment
D15:00
R/W
DR
IS
DeviceRemovable
Each bit is dedicated to a root hub port.
When cleared, the attached device is removable.
When set, the attached device is not removable.
Bit 0: Reserved
Bit 1: Device attached to port #1
Bit 2: Device attached to port #2
...
Bit 15: device attached to port #15
Bits
Access
Mnemonic
Reset
Description
Table 442: HcRhDesdcriptorB register
Bits
Access
Mnemonic
Reset
Description
D31
W
CRWE
N/A
ClearRemoteWakeupEnable
0
Has no effect
1
Clears DeviceRemoveWakeupEnable
D30:18
N/A
Not used
N/A
Always write to 0.
Table 443: HcRhStatus register
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
CRWE
CCIC
LPSC
DRWE
Not used
OCI
LPS