AT43USB326 datasheet(49/102 Pages) ATMEL

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AT43USB326

3313D–USB–04/06

No-data Status

Response State

The Function Interface Unit receives an IN token from the Host. The FIU responds with a zero

length DATA1 packet until receiving an ACK from the host, then asserts a TX_COMPLETE

interrupt.

Control Read Data

Response State

The Function Interface Unit receives an IN token from the Host. The FIU responds with NAKs

until TX_PACKET_READY is set. The FIU then sends the data in the FIFO upstream, retrying

un til it s ucce ssfu lly rece ives a n ACK fr om the h os t. Fin ally, th e FIU clea rs th e

TX_PACKET_READY bit and asserts a TX_COMPLETE interrupt.

Hardware

Firmware

IN token from Host

Send DATA1(0)

ACK from Host

Set TX COMPLETE

→ INT

Read UISR

Read CSR0

If SET ADDRESS, program the new

Address, set ADD_EN bit

Clear TX_COMPLETE, clear Data

End, set Force STALL in CAR0

Set UIAR[EP0 INTACK]

Hardware

Firmware

IN token from Host

a. If TX Packet Ready = 1, send

DATA0/DATA1

b. If TX Packet Ready = 0, send NAK

ACK from Host

Clear TX Packet Ready

Set TX Complete

→ INT

Read UISR

Read CSR0

Clear TX COMPLETE in CAR0:

a. If more data: fill FIFO, set TX

Packet Ready, set DIR in CAR0

b. If no more data: set Force STALL,

set DATA END in CAR0

Set UIAR[EP0 INTACK] to clear

interrupt source

Repeat steps 1 through 8

AT43USB326 Fiches technique(PDF) 49 Page - ATMEL Corporation

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