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Service
endpoint 0
Read endpoint 0 CSR
Sent
stall
?
Yes Clear SentStall bit
state −> IDLE
No
No
Set ServicedSetupEnd
state −> IDLE
Setup
end
?
Yes
State
Yes
No
= IDLE
?
IDLE mode
TX mode
No
= TX
?
State
Yes
RX mode
= RX*
?
State
Yes
* By default
USBControllerHostandPeripheralModesOperation
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Figure5.ServiceEndpoint0FlowChart
UniversalSerialBus(USB)Controller 32SPRUGH3–November2008
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