HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 574

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Rev. 1.00, 02/04, page 536 of 804
Bit
9
8
7
6
5
4
3
2
1
0
Bit Name
NPS
PSM
NDP7
NDP6
NDP5
NDP4
NDP3
NDP2
NDP1
NDP0
Initial
Value
1
0
0
0
0
0
0
0
1
0
R/W
R/W
R/W
R
R
R
R
R
R
R
R
Description
No Power Switching
This bit selects whether the power switching is supported
or ports are always power-supplied. This bit is
implementation specific. When this bit is cleared, the
PSM bit specifies the global/port switching.
Note: Because the initial value is 1, first clear this bit
0: Ports can be power-switched.
1: Ports are always powered on when the host controller
Power Switching Mode
This bit specifies how the power switching of the root-hub
port is controlled. This bit is implementation specific. This
bit is valid only when the NPS bit is cleared.
0: All ports are simultaneously power-supplied.
1: Each port is power-supplied individually. In this mode,
Number Downstream Ports
These bits specify the number of downstream ports
supported by the root hub. These bits are implementation
specific. The minimum number of ports is 1. The
maximum number of ports which are supported by the
OpenHCI is 15.
is powered on.
the port power is controlled with either of global/port
switching. When the PPCM bit in the HcRhDescriptorB
register is set, the port is reacted only to the port-
power command (set/clear port power). When the port
mask is cleared, the port is controlled only by the
global power-switch (set/clear global power).
(write 0 with the host controller driver) to enable
power switching of the port.