beautypg.com

The general usb process – Freescale Semiconductor TWR-MCF52259-Ethenet User Manual

Page 93

background image

TM

S

o

ft

w

a

re

G

en

er

a

l

C

o

n

ce

p

ts

The General USB Process

How Data is Transferred in USB

Frame

Transfer

Transfer

There are 4 types of data transfer:

1.

Interrupt

2.

Bulk

3.

Isochronous

4.

Control

The type of transfer depends upon the type of device and its
data requirements (this is discussed in more detail later).