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JDP2S01T Datasheet, PDF (84/150 Pages) Toshiba Semiconductor – UHF~VHF Band RF Attenuator Applications | |||
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Philips Semiconductors
ISP1362
Single-chip USB OTG controller
Table 56: HcRhDescriptorA register: bit descriptionâ¦continued
Bit
Symbol Description
8
PSM
PowerSwitchingMode: This bit is used to specify how the power
switching of the Root Hub ports is controlled. It is implementation
speciï¬c. This ï¬eld is valid only if the NoPowerSwitching (NPS) ï¬eld is
cleared.
7 to 2
1 to 0
0 â all ports are powered at the same time
1 â 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).
-
reserved
NDP[1:0] NumberDownstreamPorts: These bits specify the number of
downstream ports supported by the Root Hub. It is implementation
speciï¬c. 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 ï¬elds are written during initialization to
correspond with the system implementation. Reset values are implementation
speciï¬c. Table 57 shows the bit allocation of the register.
Code (Hex): 13 â read
Code (Hex): 93 â write
Table 57: HcRhDescriptorB register: bit allocation
Bit
31
30
29
Symbol
Reset
-
-
-
Access
-
-
-
Bit
23
22
21
Symbol
reserved
Reset
-
-
-
Access
-
-
-
Bit
15
14
13
Symbol
Reset
-
-
-
Access
-
-
-
Bit
7
6
5
Symbol
reserved
Reset
-
-
-
Access
-
-
-
28
27
reserved
-
-
-
-
20
19
-
-
-
-
12
11
reserved
-
-
-
-
4
3
-
-
-
-
26
25
24
-
-
-
-
-
-
18
17
16
PPCM[2:0]
IS
R/W
R/W
R/W
10
9
8
-
-
-
-
-
-
2
1
0
DR[2:0]
IS
R/W
R/W
R/W
9397 750 12337
Product data
Rev. 03 â 06 January 2004
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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