SC3200 datasheet(307/447 Pages) AMD

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AMD Geode™ SC3200 Processor Data Book

307

Core Logic Module - USB Controller Registers - PCIUSB

Revision 5.1

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.

OverCurrentIndicator. This bit reflects the state of the OVRCUR pin. This field is only valid if NoOverCurrentProtection

and OverCurrentProtectionMode are cleared.

0: No over-current condition.

1:Over-current condition.

Read: LocalPowerStatus. Not Supported. Always read 0.

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

Note:

This register is reset by the UsbReset state.

Table 6-42. USB_BAR+Memory Offset: USB Controller Registers (Continued)

Bit

Description

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