AT83SND2CMP3 datasheet(44/97 Pages) ATMEL

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AT83SND2CMP3

7524B–MP3–05/06

Description

The USB device controller provides the hardware that the AT83SND2CMP3 needs to

interface a USB link to a data flow stored in a double port memory.

It requires a 48 MHz reference clock provided by the clock controller as detailed in Sec-

tion "", page 44. This clock is used to generate a 12 MHz Full Speed bit clock from the

received USB differential data flow and to transmit data according to full speed USB

device tolerance. Clock recovery is done by a Digital Phase Locked Loop (DPLL) block.

The Serial Interface Engine (SIE) block performs NRZI encoding and decoding, bit stuff-

ing, CRC generation and checking, and the serial-parallel data conversion.

The Universal Function Interface (UFI) controls the interface between the data flow and

the Dual Port RAM, but also the interface with the C51 core itself.

Figure 30 shows how to connect the AT83SND2CMP3 to the USB connector. D+ and D-

pins are connected through 2 termination resistors. Value of these resistors is detailed in

the section “DC Characteristics”.

Figure 28.

USB Device Controller Block Diagram

Figure 29.

USB Connection

USB

CLOCK

48 MHz

12 MHz

D+

D-

DPLL

SIE

UFI

USB

Buffer

To/From

C51 Core

D+

D-

USB

VBUS

USB

GND

D+

D-

VSS

To Power Supply

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