SC1100 datasheet(261/348 Pages) NSC

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Core Logic Module (Continued)

ConnectStatusChange. This bit indicates a connect or disconnect event has been detected. Writing a 1 clears this bit.

Writing a 0 has no effect.

0: No connect/disconnect event.

1: Hardware detection of connect/disconnect event.

If DeviceRemoveable is set, this bit resets to 1.

15:10

Reserved. Read/Write 0s.

Read: LowSpeedDeviceAttached. This bit defines the speed (and bud idle) of the attached device. It is only valid when

CurrentConnectStatus is set.

0: Full speed device.

1: Low speed device.

Write: ClearPortPower. Writing a 1 clears PortPowerStatus. Writing a 0 has no effect.

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.

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.

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.

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.

Read: PortEnableStatus.

0: Port disabled.

1: Port enabled.

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

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.

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

Bit

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SC1100 Datasheet(PDF) 261 Page - National Semiconductor (TI)

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