AT83SND1CXXX-ROTIL datasheet(82/212 Pages) ATMEL

Part #	AT83SND1CXXX-ROTIL

Description	Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface

PDF	212 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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82 / 212 page

4109J–8051–10/06

AT8xC51SND1C

•

Bit stuffing and unstuffing.

•

CRC generation and checking.

•

ACKs and NACKs automatic generation.

•

TOKEN type identifying.

•

Address checking.

•

Clock recovery (using DPLL).

Figure 14-4. SIE Block Diagram

14.1.3

Function Interface Unit (UFI)

The Function Interface Unit provides the interface between the AT8xC51SND1C and the SIE. It

manages transactions at the packet level with minimal intervention from the device firmware,

which reads and writes the endpoint FIFOs.

Figure 14-6 shows typical USB IN and OUT transactions reporting the split in the hardware (UFI)

and software (C51) load.

Start of Packet

Detector

Clock

Recover

SYNC Detector

PID Decoder

Address Decoder

Serial to Parallel

Converter

CRC5 & CRC16

Generator/Check

USB Pattern Generator

Parallel to Serial Converter

Bit Stuffing

NRZI Converter

CRC16 Generator

NRZI ‘ NRZ

Bit Unstuffing

Packet Bit Counter

End of Packet

Detector

USB

CLOCK

48 MHz

SysClk

Data In

D+

D-

(12 MHz)

Data Out

AT83SND1CXXX-ROTIL Datasheet(PDF) 82 Page - ATMEL Corporation

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