參數(shù)資料
型號(hào)： AT43311
廠(chǎng)商： Atmel Corp.
英文描述： USB Hub
中文描述： USB集線(xiàn)器
文件頁(yè)數(shù)： 17/24頁(yè)
文件大?。?/td> 136K
代理商： AT43311
AT43311
17
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
Hub Change Field, wHubChange
A Get_Hub_Status will occur if the setup packet is decoded
as:
Bit
Description
0
Local Power Status, indicates the state of the local power supply
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
Bit
Description
0
Local Power Status Change, C_HUB_LOCAL_POWER, corresponds to bit 0 of wHubStatus
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.
Field
Value
bmRequestType
Byte 0
10100000B
bRequest
Byte 1
00H
wValue
Byte 2
Byte 3
01H
00H
wIndex
Byte 4
Byte 5
00H
00H
wLength
Byte 6
Byte 7
04H
00H
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