SC2200 datasheet(295/433 Pages) NSC

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Core Logic Module (Continued)

NoPowerSwitching. This bit should be written to support the external system port power switching implementation.

0: Ports are power switched.

1: Ports are always powered on.

PowerSwitchingMode. This bit is only valid when NoPowerSwitching is cleared. This bit should be written 0.

0: Global Switching.

1: Individual Switching

7:0

NumberDownstreamPorts (Read Only). USB supports three downstream ports.

Note:

This register is only reset by a power-on reset (PCIRST#). It is written during system initialization to configure the Root Hub.

These bit should not be written during normal operation.

Offset 4Ch-4Fh

HcRhDescriptorB Register (R/W)

Reset Value = 00000000h

31:16

PortPowerControlMask. Global-power switching. This field is only valid if NoPowerSwitching is cleared and Power-

SwitchingMode is set (individual port switching). When set, the port only responds to individual port power switching com-

mands (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

DeviceRemoveable. USB 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.

Note:

This register is only reset by a power-on reset (PCIRST#). It is written during system initialization to configure the Root Hub.

These bit should not be written during normal operation.

Offset 50h-53h

HcRhStatus Register (R/W)

Reset Value = 00000000h

ClearRemoteWakeupEnable (Write Only). Writing a 1 to this bit clears DeviceRemoteWakeupEnable. Writing a 0 has no

effect.

30:18

Reserved. Read/Write 0s.

OverCurrentIndicatorChange. This bit is set when OverCurrentIndicator changes. Writing a 1 clears this bit. Writing a 0

has no effect.

Read: LocalPowerStatusChange. Not supported. Always read 0.

Write: SetGlobalPower. Write a 1 issues a SetGlobalPower command to the ports. Writing a 0 has no effect.

Read: DeviceRemoteWakeupEnable. This bit enables ports' ConnectStatusChange as a remote wakeup event.

0: Disabled.

1: Enabled.

Write: SetRemoteWakeupEnable. Writing a 1 sets DeviceRemoteWakeupEnable. Writing a 0 has no effect.

14:2

Reserved. Read/Write 0s.

Table 5-42. USB_BAR+Memory Offset: USB Controller Registers (Continued)

Bit

Description

SC2200 Datasheet(PDF) 295 Page - National Semiconductor (TI)

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