ISP1362
Single-chip USB OTG controller
Philips Semiconductors
Table 56: HcRhDescriptorA register: bit description…continued
Bit
Symbol Description
PSM
8
PowerSwitchingMode: This bit is used to specify how the power
switching of the Root Hub ports is controlled. It is implementation
specific. This field is valid only if the NoPowerSwitching (NPS) field is
cleared.
0 — all ports are powered at the same time
1 — each port is individually powered. This mode allows port power to
be controlled by either the global switch or per-port switching. If the
PortPowerControlMask (PPCM) bit is set, the port responds to only
port power commands (Set/ClearPortPower). If the port mask is
cleared, then the port is controlled only by the global power switch
(Set/ClearGlobalPower).
7 to 2
1 to 0
-
reserved
NDP[1:0] NumberDownstreamPorts: These bits specify the number of
downstream ports supported by the Root Hub. It is implementation
specific. The maximum number of ports supported is 2.
15.3.2 HcRhDescriptorB register (R/W: 13H/93H)
The HcRhDescriptorB register is the second register of two describing the
characteristics of the Root Hub. These fields are written during initialization to
correspond with the system implementation. Reset values are implementation
specific. Table 57 shows the bit allocation of the register.
Code (Hex): 13 — read
Code (Hex): 93 — write
Table 57: HcRhDescriptorB register: bit allocation
Bit
31
30
29
28
27
26
25
24
Symbol
Reset
Access
Bit
reserved
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
23
22
21
20
19
18
17
16
Symbol
Reset
Access
Bit
reserved
PPCM[2:0]
-
-
-
-
-
-
-
-
-
-
IS
R/W
9
R/W
R/W
15
14
13
12
11
10
8
Symbol
Reset
Access
Bit
reserved
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
7
6
5
4
3
2
0
Symbol
Reset
Access
reserved
DR[2:0]
IS
-
-
-
-
-
-
-
-
-
-
R/W
R/W
R/W
9397 750 12337
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data
Rev. 03 — 06 January 2004
84 of 150
NXP [ NXP ]
