SH7721 datasheet(850/1524 Pages) RENESAS

850 / 1524 page

Section 24

USB Host Controller (USBH)

Rev. 3.00 Jan. 18, 2008 Page 788 of 1458

REJ09B0033-0300

Bit

Bit Name

Initial

Value

R/W

Description

NPS

R/W

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.

0: Ports can be power-switched

1: Ports are always powered on when the host controller is

powered on

Note:

Since the initial value is 1, first clear this bit (write 0

with the HCD) to enable power switching of the

port.

PSM

R/W

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,

the port power is controlled with either of global/port

switching. When the PPCM bit in USBHRDB 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).

NDP7

NDP6

NDP5

NDP4

NDP3

NDP2

NDP1

NDP0

Number Down stream Ports

These bits specify the number of downstream ports

supported by the root hub. These bits are implementation

specific.

In this LSI, their value is H'2.

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