ISP1160
Embedded USB Host Controller
Philips Semiconductors
10.3.4 HcRhPortStatus[1:2] (R/W [1]:15H/95H, [2]: 16H/96H)
The HcRhPortStatus[1:2] register is used to control and report port events on a
per-port basis. NumberDownstreamPorts represents the number of HcRhPortStatus
registers that are implemented in hardware. The lower word is used to reflect the port
status, whereas the upper word reflects the status change bits. Some status bits are
implemented with special write behavior. If a transaction (token through handshake)
is in progress when a write to change port status occurs, the resulting port status
change must be postponed until the transaction completes. Reserved bits should
always be written logic 0.
Code (Hex): [1] = 15, [2] = 16 — read
Code (Hex): [1] = 95, [2] = 96 — write
Table 34: HcRhPortStatus[1:2] register: bit allocation
Bit
31
30
29
28
27
26
25
24
Symbol
Reset
Access
Bit
reserved
0
0
R/W
22
0
0
0
R/W
19
0
R/W
18
0
R/W
17
0
R/W
16
R/W
23
R/W
21
R/W
20
Symbol
Reset
Access
Bit
reserved
0
PRSC
0
OCIC
0
PSSC
0
PESC
0
CSC
0
0
0
R/W
15
R/W
14
R/W
13
R/W
12
R/W
11
R/W
10
R/W
9
R/W
8
Symbol
Reset
Access
Bit
reserved
LSDA
0
PPS
0
0
R/W
7
0
R/W
6
0
R/W
5
0
R/W
4
0
R/W
3
0
R/W
2
R/W
1
R/W
0
Symbol
Reset
Access
reserved
0
PRS
0
POCI
0
PSS
0
PES
0
CCS
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Table 35: HcRshPortStatus[1:2] register: bit description
Bit
Symbol
-
Description
31 to 21
20
reserved
PRSC
PortResetStatusChange: This bit is set at the end of the 10 ms
port reset signal. The HCD writes a logic 1 to clear this bit. Writing
a logic 0 has no effect.
0 — port reset is not complete
1 — port reset is complete
19
OCIC
PortOverCurrentIndicatorChange: This bit is valid only if
overcurrent conditions are reported on a per-port basis. This bit is
set when Root Hub changes the PortOverCurrentIndicator bit. The
HCD writes a logic 1 to clear this bit. Writing a logic 0 has no
effect.
0 — no change in PortOverCurrentIndicator
1 — PortOverCurrentIndicator has changed
9397 750 11371
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
Product data
Rev. 04 — 04 July 2003
53 of 88
NXP [ NXP ]
