AT43USB326 datasheet(70/102 Pages) ATMEL

70 / 102 page

AT43USB326

3313D–USB–04/06

Hub Port Status Change Register – PSCR1..3

The microcontroller firmware uses the bits in this register to monitor when a port status change

has occurred, which then gets reported to the host through the Port Change Field

wPortChange.

Except for bit 3, the Port Overcurrent Indicator Change, the bits in this register are set by the

USB hardware. Otherwise, the firmware should only clear these bits.

• Bit 7..5 – Reserved

These bits are reserved in the AT43USB326 and will read as zero.

• Bit 4 – RSTSC: Port Reset Status Change

0 = No change

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

firmware 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 Sta-

tus 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

ClearPortFeature(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

Bit

543

Port1 $1FB0

–

RSTSC

POCIC

PSSC

PESC

PCSC

PSCR1

Port2 $1FB1

–

RSTSC

POCIC

PSSC

PESC

PCSC

PSCR2

Port3 $1FB2

–

RSTSC

POCIC

PSSC

PESC

PCSC

PSCR3

Read/Write

Initial Value

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