AT80SND1C-ROTIL datasheet(83/210 Pages) ATMEL

Numer części	AT80SND1C-ROTIL

Szczegółowy opis	Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface

PDF	210 Pages

Scroll/Zoom	100%

Producent	ATMEL [ATMEL Corporation]

Strona internetowa	http://www.atmel.com

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83 / 210 page

AT8xC51SND1C

4109E–8051–06/03

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 59 shows typical USB IN and OUT transactions reporting the split in the hard-

ware (UFI) and software (C51) load.

Figure 58. UFI Block Diagram

Figure 59. USB Typical Transaction Load

To/From C51 Core

Endpoint Control

C51 side

Endpoint Control

USB side

Endpoint 2

Endpoint 1

Endpoint 0

USBCON

USBINT

USBIEN

UEPINT

UEPIEN

UEPNUM

UEPSTAX

USBADDR

UEPCONX

UEPDATX

UEPRST

UBYCTX

UFNUMH

UFNUML

Asynchronous Information

Transfer

Control

FSM

To/From SIE

12 MHz DPLL

OUT Transactions:

HOST

UFI

C51

OUT

DATA0 (n Bytes)

ACK

Endpoint FIFO read (n Bytes)

OUT

DATA1

NACK

OUT

DATA1

ACK

IN Transactions:

HOST

UFI

C51

ACK

Endpoint FIFO Write

DATA1

NACK

C51 interrupt

DATA1

C51 interrupt

Endpoint FIFO write

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