AT43311 Просмотр технического описания (PDF) - Atmel Corporation

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AT43311

USB Hub

Atmel Corporation 

AT43311

Get_Hub_Status

Get_Hub_Status returns the current Hub status that has changed since the previous acknowledgment of the setup packet

of the Host.

The Hub will returned two words of data as described in the following two tables. Word0 is the Hub Status Field, wHubSta-

tus, and Word1 is the Hub Change Field,wHubChange.

Hub Status Field, wHubStatus

Bit Description

Local Power Status, indicates the state of the local power supply

0

0 = Local power supply good

1 = Local power supply lost

1

Over-Current Indicator, indicates over-current condition on a global hub basis. AT43311 reports over current

condition on a per port basis therefore this bit is always read as 0

2-15 Reserved. Always read as 0’s

Hub Change Field, wHubChange

Bit

Description

Local Power Status Change, C_HUB_LOCAL_POWER, corresponds to bit 0 of wHubStatus

0

0 = No change has occurred in local power status

1 = Local power status has changed

1

Over-Current Indicator Change, C_HUB_OVER_CURRENT, corresponds to bit 1 of wHubStatus. AT43311

reports over current condition on a per port basis and therefore this bit is always read as 0

2-15 Reserved. Always read as 0’s.

A Get_Hub_Status will occur if the setup packet is decoded

as:

Field

Value

bmRequestType

Byte 0

10100000B

bRequest

Byte 1

00H

wValue

Byte 2

01H

Byte 3

00H

wIndex

Byte 4

00H

Byte 5

00H

wLength

Byte 6

04H

Byte 7

00H

17

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