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ISP1561 Datasheet, PDF (57/102 Pages) NXP Semiconductors – ISP1561BM
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Philips Semiconductors
ISP1561
USB PCI host controller
Table 78: HcRhDescriptorA register: bit allocation
Bit
31
30
29
Symbol
Reset
1
1
1
Access
R/W
R/W
R/W
Bit
23
22
21
Symbol
Reset
0
0
0
Access
-
-
-
Bit
15
14
13
Symbol
reserved
Reset
0
0
0
Access
-
-
-
Bit
7
6
5
Symbol
Reset
0
0
0
Access
R
R
R
28
27
POTPGT[7:0]
1
1
R/W
R/W
20
19
reserved
0
0
-
-
12
11
NOCP
OCPM
0
1
R/W
R/W
4
3
NDP[7:0]
0
0
R
R
[1] X is 1 for OHCI1 (2P) and OHCI2 (2P); X is 0 for OHCI1 (1P) and OHCI2 (1P).
[2] X is 0 for OHCI1 (2P) and OHCI2 (2P); X is 1 for OHCI1 (1P) and OHCI2 (1P).
26
1
R/W
18
0
-
10
DT
0
R
2
0
R
25
1
R/W
17
0
-
9
NPS
0
R/W
1
X[1]
R
24
1
R/W
16
0
-
8
PSM
1
R/W
0
X[2]
R
Table 79: 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. It is implementation-specific. The unit of time
is 2 ms. The duration is calculated as POTPGT × 2 ms.
23 to 13 -
reserved
12
NOCP
NoOverCurrentProtection: This bit describes how the
overcurrent status for Root Hub ports are reported. When this
bit is cleared, the OCPM (OverCurrentProtectionMode) field
specifies global or per-port reporting.
11
OCPM
0 — overcurrent status is reported collectively for all
downstream ports
1 — no overcurrent protection supported
OverCurrentProtectionMode: This bit describes how the
overcurrent status for Root Hub ports are reported. At reset,
this fields reflects the same mode as PowerSwitchingMode.
This field is valid only if the NOCP field is cleared.
10
DT
0 — overcurrent status is reported collectively for all
downstream ports
1 — overcurrent status is reported on a per-port basis
DeviceType: This bit specifies that the Root Hub is not a
compound device. The Root Hub is not permitted to be a
compound device. This field should always read 0.
9397 750 10015
Product data
Rev. 01 — 06 February 2003
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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