AT43USB325 datasheet(86/109 Pages) ATMEL

86 / 109 page

3355C–USB–4/05

AT43USB325

8.4.4

Hub Port Status Register

The bits in this register are used by the microcontroller firmware when reporting a port's status

through the Port Status Field, wPortStatus. Bits 3 (POCI) and 5 (PPSTAT) are used by the USB

hardware and are the only two bits that the firmware should set or clear. All other bits should not

be modified by the firmware.

8.4.4.1

Hub Port Status Register – HPSTAT1:5

• Bit 7 – Reserved

This bit is reserved in the AT43USB325 and will read as zero.

• Bit 6 – LSP: Low-speed Device Attached

0 = Full-speed device attached to this port

1 = Slow-speed device attached to this port

Set to 0 for Port 1 (full-speed only). Set and cleared by the hardware upon detection of device at

EOF2.

• Bit 5 – PPSTAT: Port Power Status

0 = Port is powered OFF

1 = Port is powered ON

Set to 1 for Port 1. Set and cleared based on present status of port power.

• Bit 4 – PRSTAT: Port Reset Status

0 = Reset signaling not asserted

1 = Reset signaling asserted

Set and cleared by the hardware as a result of initiating a port reset by Port Control Register.

• Bit 3 – POCI: Port Overcurrent Indicator

0 = Power normal

1 = Overcurrent exist on port

Set to 0 for Port 1. Set and cleared by firmware upon detection of an overcurrent or removal of

an overcurrent.

Bit

Port1 $1FB8

–

LSP

PPSTAT

PRSTAT

POCI

PSSTAT

PESTAT

PCSTAT

HPSTAT1

Port2 $1FB9

–

LSP

PPSTAT

PRSTAT

POCI

PSSTAT

PESTAT

PCSTAT

HPSTAT2

Port3 $1FBA

–

LSP

PPSTAT

PRSTAT

POCI

PSSTAT

PESTAT

PCSTAT

HPSTAT3

Port4 $1FBB

–

LSP

PPSTAT

PRSTAT

POCI

PSSTAT

PESTAT

PCSTAT

HPSTAT4

Port5 $1FBC

–

LSP

PPSTAT

PRSTAT

POCI

PSSTAT

PESTAT

PCSTAT

HPSTAT5

Read/Write

R/W

Initial Value

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