Rainbow-electronics W90P710CDG Bedienungsanleitung PDF herunterladen (Seite 189)

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101

W90P710CD/W90P710CDG

Publication Release Date: September 19, 2006

- 189 - Revision B2

Host Controller Root Hub Descriptor B Register

This register is only reset by a power-on reset. It is written during system initialization to configure the

Root Hub. These bits should not be written during normal operation.

RESET

VALUE

HcRhDescriptorB 0xFFF0_504C

R/W Host Controller Root Hub Descriptor B Register 0x0000_0000

31 30 29 28 27 26 25 24

PPCM

23 22 21 20 19 18 17 16

PPCM

15 14 13 12 11 10 9 8

DEVRM

7 6 5 4 3 2 1 0

DEVRM

BITS DESCRIPTION

[31:16] PPCM

PortPowerControlMask

Global-power switching. This field is only valid if NoPowerSwitching is

cleared and PowerSwitchingMode is set (individual port switching). When

set, the port only responds to individual port power switching commands

(Set/ClearPortPower). When cleared, the port only responds to global power

switching commands (Set/ClearGlobalPower).

0 = Device not removable

1 = Global-power mask

Port Bit relationship - Unimplemented ports are reserved, read/write '0'.

0 : Reserved

1 : Port 1

2 : Port 2

...

15 : Port 15

[15:0] DEVRM

DeviceRemoveable

table of none-4 ports default to removable devices.

0 = Device not removable

1 = Device removable

Port Bit relationship

0 : Reserved

1 : Port 1

2 : Port 2

...

15 : Port 15

Unimplemented ports are reserved, read/write '0'.

1 2 ... 184 185 186 187 188 189 190 191 192 193 194 ... 551 552

Rainbow-electronics W90P710CDG Bedienungsanleitung Seite 189

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