AT43USB325 datasheet(64/109 Pages) ATMEL

64 / 109 page

3355C–USB–4/05

AT43USB325

8.1.1

Control Transfers at Control End-point EP0

The description given below is for the function control end-point, but applies to the hub control

end-point 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

Control

Write

DATA0

DATA1

DATA0

DATA0/1

DATA1(0)

Control

Read

DATA0

DATA1

DATA0

DATA0/1

DATA1(0)

Setup

Status

Stage

No-data

Control

DATA0

DATA1(0)

SETUP(0)

OUT(1)

OUT(0)

OUT(0/1)

…

IN(1)

SETUP(0)

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

AT43USB325 Datasheet(PDF) 64 Page - ATMEL Corporation

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