IDLE Mode
RxPktRdy
Set?
Yes
Unload FIFO
Decode Command
Command
Has Data
Phase?
Set
ServicedRxPktRdy
Data Phase
=
IN?
No
Return
No
Process Command
Set ServicedRxPktRdy
Set DataEnd
Return
Return
Return
Yes
State TX®
No
State RX®
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Functional Description
16.3.8.1.1.4.2 Idle Mode: Control Transfer of Peripheral Mode
IDLE mode is the mode the Endpoint 0 control needs to 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 Figure 16-5).
Figure 16-5. Flow Chart of Setup Stage of a Control Transfer in Peripheral Mode
1707
SPRUH73H–October 2011–Revised April 2013 Universal Serial Bus (USB)
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