AT43USB325 datasheet(89/109 Pages) ATMEL

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3355C–USB–4/05

AT43USB325

1 = Reset complete

This bit is set by the USB hardware after it completes RESET signaling which is initiated when

the Reset and Enable Port command is detected at the Port Control Register, HPCON. The firm-

ware sends this command when it decodes a SetPortFeature(PORT_RESET) request from the

host.

At EOF2 after the hardware completes the port reset, the hardware sets the Port Enable Status

bit and clears the Port Reset Status bit of the Hub Port Status Register, HPSTAT. Cleared by

firmware, ClearPortFeature(PORT_RESET).

• Bit 3 – POCIC: Port Overcurrent Indicator Change

0 = No change has occurred on Overcurrent Indicator

1 = Overcurrent Indicator has changed

This bit is relevant to hubs with individual overcurrent reporting only. The firmware sets this bit

as a result of detecting overcurrent at the ports OVC# pin. The firmware clears bit through Clear-

PortFeature(PORT_OVER_CURRENT). For Port 1, this bit is always cleared.

• Bit 2 – PSSC: Port Suspend Status Change

0 = No change

1 = Resume completed

Port 2, 3 set by hardware upon completion of firmware initiated resume process. Port 1 set by

firmware 20 ms after the next EOF2 after completion of resume process. RESUME signaling is

initiated through global resume, selective resume and remote wakeup. Cleared by firmware via

host request ClearPortFeature(PORT_SUSPEND).

• Bit 1 – PESC: Port Enable/Disable Status Change

0 = No change has occurred on Port Enable/Disable Status

1 = Port Enable/Disable status has changed

Set by hardware due to babble, physical disconnect or overcurrent except for Port 1 in which

case it is set by hardware at EOF2 due to hardware events. Cleared by firmware via Host

request ClearPortFeature(PORT_ENABLE).

• Bit 0 – PCSC: Port Connect Status Change

0 = No change has occurred on Current Connect Status

1 = Current Connect Status has changed

This bit is set by hardware at EOF2 after it detects a connect or disconnect at a port, except for

Port 1. Hardware sets this bit for Port 5 after a hub reset. Cleared by firmware via Host request

ClearPortFeature(PORT_CONNECTION).

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