AT89C5131-RDTIL datasheet(114/176 Pages) ATMEL

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114

AT89C5131

4136B–USB–09/03

USB Controller

Introduction

The AT89C5131 implements a USB device controller supporting full speed data transfer

in accordance with the USB 1.1 and 2.0 Specifications. In addition to the default control

endpoint 0, it provides 6 other endpoints, which can be configured in control, bulk, inter-

rupt or isochronous modes:

•

Endpoint 0:32-byte FIFO, default control endpoint

•

Endpoint 1, 2, 3: 32-byte FIFO

•

Endpoint 4, 5: 2 x 64-byte Ping-pong FIFO

•

Endpoint 6: 2 x 512-byte Ping-pong FIFO

This allows the firmware to be developed conforming to most USB device classes, for

example:

•

USB Mass Storage Class Control/Bulk/Interrupt (CBI) Transport, Revision 1.0 -

December 14, 1998

•

USB Mass Storage Class Bulk-only Transport, Revision 1.0 - September 31, 1999

•

USB Human Interface Device Class, Version 1.1 - April 7, 1999

•

USB Device Firmware Upgrade Class, Revision 1.0 - May 13, 1999

USB Mass Storage Classes

USB Mass Storage Class CBI

Transport

Within the CBI framework, the control endpoint is used to transport command blocks as

well as to transport standard USB requests. One Bulk-out endpoint is used to transport

data from the host to the device. One Bulk-in endpoint is used to transport data from the

device to the host. And one interrupt endpoint may also be used to signal command

completion (protocol 0) but it is optional and may not be used (protocol 1).

The following configuration adheres to these requirements:

•

Endpoint 0: 8 bytes, Control In-Out

•

Endpoint 4: 64 bytes, Bulk-out

•

Endpoint 5: 64 bytes, Bulk-in

•

Endpoint 3: 8 bytes, Interrupt In

USB Mass Storage Class Bulk-

only Transport

Within the Bulk-only framework, the Control endpoint is only used to transport class-

specific and standard USB requests for device set-up and configuration. One Bulk-out

endpoint is used to transport commands and data from the host to the device. One Bulk-

in endpoint is used to transport status and data from the device to the host. No interrupt

endpoint is needed.

The following configuration adheres to these requirements:

•

Endpoint 0: 8 bytes, Control In-Out

•

Endpoint 4: 64 bytes, Bulk-out

•

Endpoint 5: 64 bytes, Bulk-in

•

Endpoint 3: not used

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