AT43USB353M datasheet(14/95 Pages) ATMEL

14 / 95 page

AT43USB353M

3307B–USB–4/04

address range $00 – $1F are directly bit-accessible using the SBI and CBI instructions. In

these registers, the value of single bits can be checked by using the SBIS and SBIC instruc-

tions. Refer to the instruction set documentations of the AVR for more details. When using the

I/O specific commands, IN and OUT, the I/O address $00 – $3F must be used. When address-

ing I/O registers as SRAM, $20 must be added to this address. All I/O register addresses

throughout this document are shown with the SRAM address in parentheses.

For compatibility with future devices, reserved bits should be written to zero if accessed.

Reserved I/O memory addresses should never be written.

USB Hub

A block diagram of the USB hardware of the AT43USB353M is shown in Figure 3. The USB

hub of the AT43USB353M has 3 downstream ports. The embedded function is permanently

attached to Port 1. Ports 2 and 3 are available as external ports. The actual number of ports

used is strictly defined by the firmware of the AT43USB353M and can vary from 0 to 2.

Because the exact configuration is defined by firmware, ports 2 and 3 may even function as

permanently attached ports as long as the Hub Descriptor identifies them as such.

USB Function

The embedded USB function has its own device address and has a default end-point plus 3

other programmable end-points. Two of these end-points contain their own 64-byte FIFO while

the third end-point has an 8-byte FIFO. End-points 1 - 3 can be programmed as interrupt IN or

OUT or bulk IN or OUT end-points.

Figure 3. USB Hardware

Hub Repeater

Serial Interface Engine

AVR Microcontroller

Data

Address

Control

Hub

Interface

Unit

Port 1

Function

Interface

Unit

Port 0

XCVR

Port 2

XCVR

Port 3

XCVR

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