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34.2.7.1.1.5.1 IDLE Mode
IDLE mode is the mode the endpoint 0 control must select at power-on or reset and is the mode to which
the endpoint 0 control should return when the RX and TX modes are terminated. It is also the mode in
which the SETUP phase of control transfer is handled (as outlined in
SPRUH82C – April 2013 – Revised September 2016
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Figure 34-7. IDLE Mode Flow Chart
IDLE mode
No
RxPktRdy
set?
Yes
Unload FIFO
Decode command
Command
No
has data
phase
?
Yes
Set
ServiceRxPktRdy
Data
Yes
phase = IN
?
No
State −> RX
Return
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Figure
34-7).
Return
Process command
Set ServicedRxPktRdy
Set DataEnd
Return
State −> TX
Return
Universal Serial Bus 2.0 (USB) Controller
Architecture
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