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AT43USB326 Fiches technique(PDF) 47 Page - ATMEL Corporation

No de pièce AT43USB326
Description  Multimedia USB Keyboard Controller with Embedded Hub
PDF  102 Pages
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Fabricant  ATMEL [ATMEL Corporation]
Site Internet  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT43USB326 Fiches technique(HTML) 47 Page - ATMEL Corporation

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47
AT43USB326
3313D–USB–04/06
Control Transfers at
Control Endpoint EP0
The description given below is for the function control endpoint, but applies to the hub control
endpoint as well if the proper registers are used.
The following illustration describes the three possible types of control transfers – Control
Write, Control Read and No-data control:
The following state diagram shows how the various state transitions are triggered. Additional
decision making may take place within the response states to determine the next expected
state. Unmarked arcs represent transitions that trigger immediately following completion of the
response state processing. Stable states, those requiring an interrupt to exit having no
unmarked arcs as exit paths, are shown in bold.
Setup
Data
Status
Stage
Stage
Stage
Control
Write
DATA0
DATA1
DATA0
DATA0/1
DATA1(0)
Control
Read
DATA0
DATA1
DATA0
DATA0/1
DATA1(0)
Setup
Status
Stage
Stage
No-data
Control
DATA0
DATA1(0)
SETUP(0)
SETUP(0)
OUT(1)
OUT(0)
OUT(0/1)
…
IN(1)
IN(1)
SETUP(0)
IN(1)
IN(1)
OUT(1)
IN(0)
IN(0/1)
…
Legend:
DATAn
Data packet with PID’s
data toggle bit equal to n
DATA1(0)
Zero length DATA1 packet
Idle
Setup
Response
No-data
Status
Response
Control
Read Status
Response
Control
Write Status
Response
RX_SETUP_INT
RX_OUT_INT
TX_COMPLETE_INT
TX_COMPLETE_INT
TX_COMPLETE_INT
RX_OUT_INT
Control
Read Data
Response
TX_COMPLETE_INT
Control
Write Data
Response
RX_OUT_INT
(ANY STABLE STATE)



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