32579BCore Logic Module - USB Controller Registers - PCIUSB

 

 

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

Bit

 

Description

 

 

 

 

8

 

Read: PortPowerStatus. This bit reflects the power state of the port regardless of the power switching mode.

 

 

0: Port power is off.

 

 

 

1: Port power is on.

 

 

 

If NoPowerSwitching is set, this bit is always read as 1.

 

 

 

Write: SetPortPower. Writing a 1 sets PortPowerStatus. Writing a 0 has no effect.

 

 

 

 

 

7:5

 

Reserved. Read/Write 0s.

 

 

 

 

 

4

 

Read: PortResetStatus.

 

 

 

0: Port reset signal is not active.

 

 

 

1: Port reset signal is active.

 

 

 

Write: SetPortReset. Writing a 1 sets PortResetStatus. Writing a 0 has no effect.

 

 

 

 

3

 

Read: PortOverCurrentIndicator. This bit reflects the state of the OVRCUR pin dedicated to this port. This field is only

 

 

valid if NoOverCurrentProtection is cleared and OverCurrentProtectionMode is set.

 

 

 

0: No over-current condition.

 

 

 

1: Over-current condition.

 

 

 

Write: ClearPortSuspend. Writing a 1 initiates the selective resume sequence for the port. Writing a 0 has no effect.

 

 

 

 

2

 

Read: PortSuspendStatus.

 

 

 

0: Port is not suspended.

 

 

 

1: Port is selectively suspended.

 

 

 

Write: SetPortSuspend. Writing a 1 sets PortSuspendStatus. Writing a 0 has no effect.

 

 

 

 

 

1

 

Read: PortEnableStatus.

 

 

 

0:

Port disabled.

 

 

 

1:

Port enabled.

 

 

 

Write: SetPortEnable. Writing a 1 sets PortEnableStatus. Writing a 0 has no effect.

 

 

 

 

 

0

 

Read: CurrentConnectStatus.

 

 

 

0:

No device connected.

 

 

 

1:

Device connected.

 

 

 

If DeviceRemoveable is set (not removable) this bit is always 1.

 

 

 

Write: ClearPortEnable. Writing 1 a clears PortEnableStatus. Writing a 0 has no effect.

 

 

 

 

 

Note:

This register is reset by the UsbReset state.

 

 

 

 

Offset 60h-9Fh

Reserved

Reset Value = xxh

 

 

 

 

 

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AMD Geode™ SC1200/SC1201 Processor Data Book

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AMD SC1200, SC1201 manual 32579BCore Logic Module USB Controller Registers Pciusb, Reserved Reset Value = xxh 294