ISP1160
Embedded USB Host Controller
Philips Semiconductors
Table 28: HcRhDescriptorA register: bit description
Bit
31
30
29
28
27
26
25
24
Symbol
Reset
Access
Bit
POTPGT[7:0]
IS
R/W
23
IS
R/W
22
IS
R/W
21
IS
R/W
20
IS
R/W
19
IS
R/W
18
IS
R/W
17
IS
R/W
16
Symbol
Reset
Access
Bit
reserved
0
0
0
0
R/W
12
0
0
R/W
10
DT
0
0
R/W
9
0
R/W
8
R/W
15
R/W
R/W
13
R/W
11
14
Symbol
Reset
Access
Bit
reserved
NOCP
IS
OCPM
IS
NPS
IS
PSM
IS
0
R
7
0
R
6
0
R
5
R/W
4
R/W
3
R
R/W
1
R/W
0
2
Symbol
Reset
Access
reserved
NDP[1:0]
0
0
0
0
0
0
IS
R
IS
R
R
R
R
R
R
R
Table 29: HcRhDescriptorA register: bit description
Bit
Symbol
Description
31 to 24
POTPGT
[7:0]
PowerOnToPowerGoodTime: This byte specifies the duration
HCD has to wait before accessing a powered-on port of the Root
Hub. The unit of time is 2 ms. The duration is calculated as
POTPGT × 2 ms.
23 to 13
12
-
reserved
NOCP
NoOverCurrentProtection: This bit describes how the
overcurrent status for the Root Hub ports are reported. When this
bit is cleared, the OverCurrentProtectionMode field specifies
global or per-port reporting.
0 — overcurrent status is reported collectively for all downstream
ports
1 — no overcurrent reporting supported
11
OCPM
OverCurrentProtectionMode: This bit describes how the
overcurrent status for the Root Hub ports is reported. At reset, this
field reflects the same mode as PowerSwitchingMode. This field is
valid only if the NoOverCurrentProtection field is cleared.
0 — overcurrent status is reported collectively for all downstream
ports
1 — overcurrent status is reported on a per-port basis. On
power-up, clear this bit and then set it to logic 1.
10
DT
DeviceType: This bit specifies that the Root Hub is not a
compound device—it is not permitted. This field should always
read/write 0.
9397 750 11371
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
Product data
Rev. 04 — 04 July 2003
49 of 88
NXP [ NXP ]
