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 数据表(PDF) 78 Page - ATMEL Corporation

AT43USB355M-AC 数据表(HTML) 78 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载