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MB90335 Series
12.6
Each Token Flow Chart of USB HOST
The flow chart of each token of USB HOST is as follows.
■ IN, OUT, SETUP Token
CM44-10137-6E
Figure 12.6-1 Flow Chart at IN, OUT, SETUP Token
IN,OUT,
SETUP TOKEN
HADR change?
NO
IN TOKEN
NO
EP1 DIR=1?
NO
EP2C PKS
change?
NO
Buffer direction
OK?
YES
Buffer usable?
YES
Set toggle and Endpoint,
Execute TOKEN
CMPIRQ of
HIRQ=1?
YES
END
FUJITSU MICROELECTRONICS LIMITED
12.6 Each Token Flow Chart of USB HOST
YES
HADR change
YES
YES
YES
EP1 DIR=1?
YES
NO
NO
EP1 PKS
change?
YES
PKS change
NO
Buffer direction change
NO
Set Buffer usable
NO
CHAPTER 12 USB HOST
287
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