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MB90335 Series
Figure 11.4-10 Case where STALL response is executed with software processing
Host or hub
Transaction
to EPn
Clear Feature
command to EP0
(EPn is specified.)
CM44-10137-6E
IN/OUT token
Data (at OUT)
STAL handshake
IN/OUT token
Data (at OUT)
STAL handshake
IN/OUT token
Data (at OUT)
STAL handshake
Setup token
Data
ACK handshake
FUJITSU MICROELECTRONICS LIMITED
11.4 Operation Explanation of USB Function
Function
EPn (End Point n)
of Function Macro
Internal
STAL bit
Condition bit
0
0
Internal
STAL bit
Condition bit
0
1
Internal
STAL bit
Condition bit
1
1
When STAL bit is "1", if a
transaction occurs, the
internal condition bit is
set to "1".
When the internal condition
bit is "1", STALL response to
a transaction continues.
Internal
STAL bit
Condition bit
1
0
When the internal condition
bit is "1", STALL response to
a transaction continues
Although STAL bit is "0", it
does not affect the internal
condition bit.
When EPn is specified with
Clear Feature command,
the internal condition bit is
cleared to "0".
Internal
STAL bit
Condition bit
0
0
CHAPTER 11 USB FUNCTION
Software
Sets STAL bit
to "1".
Clear STAL bit
to "0"
233
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