AT43USB355M-AC datasheet(78/115 Pages) ATMEL

78 / 115 page

AT43USB355

2603G–USB–04/06

Control Read Status

Response State

The Function Interface Unit receives an OUT token from the Host with a zero length DATA1

packet. The FIU responds with a NAK until TX_COMPLETE is cleared. The FIU will then ACK

the retried OUT token from the Host and assert an RX_OUT interrupt.

Control Write Data

Response State

The Function Interface Unit receives an OUT token from the Host with a DATA packet. The

FIU places the incoming data into the FIFO, issues an ACK to the host, and asserts an

RX_OUT interrupt.

Hardware

Firmware

OUT token from Host

DATA1(0) from Host

TX Complete = 0 ?

a. If yes, ACK to Host

Set RX OUT

→ INT

b. If no, NAK to Host

Read UISR

Read CSR0

Clear RX OUT, set Data End, set

Force Stall in H/FCAR0.

Note: A SETUP token will clear Data

End, therefore, it is not cleared by

FW in case Host retries.

Set UIAR[EP0 INTACK] to clear

interrupt source

Hardware

Firmware

OUT token from Host

Put DATA0/DATA1 into FIFO

ACK to Host

Set RX OUT

→ INT

Read UISR

Read CSR0

Read FIFO

Clear RX OUT

If last data packet, set Force STALL,

set DATA END.

Set UIAR[EP0 INTACK] to clear the

interrupt source

Repeat steps 1 through 9 until last DATA PACKET:

AT43USB355M-AC Datenblatt(PDF) 78 Page - ATMEL Corporation

AT43USB355M-AC Datenblatt(HTML) 78 Page - ATMEL Corporation

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