Freescale-semiconductor TWR-MCF52259-Ethenet Manual de usuario descargar pdf (Pagina 105)

Software – General Concepts

Host

What device class are you?

Do you supply the power or do I?

How many and of what type of

endpoints do you need?

Here is your unique address.

What transfer mode do you want?

Endpoints: A uniquely identifiable portion of a Universal

Serial Bus device that is the source or sink of information

in a communication flow between the host and device.

Power can be supplied by the host or the device.

1. Interrupt

2. Bulk

3. Isochronous

4. Control

There are 4 types of data

transfer:

USB Classes have been defined that include class-specific descriptors (e.g. HID

class and mass-storage class)

The Enumeration Process:

What happens when a device is connected?

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Freescale-semiconductor TWR-MCF52259-Ethenet Manual de usuario Pagina 105