AT90USB646 datasheet(295/434 Pages) ATMEL

295 / 434 page

295

7593A–AVR–02/06

AT90USB64/128

Figure 23-3. Pipe activation flow:

Once the Pipe is activated (EPEN set) and, the hardware is ready to send requests to the

Device.

When configured (CFGOK = 1), only the Pipe Token (PTOKEN) and the polling interval for Inter-

rupt pipe can be modified.

A Control type pipe supports only 1 bank. Any other value will lead to a configuration error

(CFGOK = 0).

A clear of PEN will reset the configuration of the Pipe. All the corresponding Pipe registers are

reset to there reset values. Please refers to the Memory Management chapter for more details.

Note: The firmware has to configure the Default Control Pipe with the following parameters:

• Type: Control

• Token: SETUP

• Data bank: 1

• Size: 64 Bytes

The firmware asks for 8 bytes of the Device Descriptor sending a GET_DESCRIPTOR request.

These bytes contains the MaxPacketSize of the Device default control endpoint and the firm-

ware re-configures the size of the Default Control Pipe with this size parameter.

Pipe

Activ ation

UPCONX

PENABLE=1

UPCFG0X

PTYPE

PT OKEN

PEPNUM

CFGOK=1

ERROR

Yes

UPCFG2X

INT FRQ

(interruptonly)

Pipeactiv ated

and f reezed

UPCFG1X

PSIZE

PBK

CFGMEM

Enablethepipe

SelectthePipetype:

*T ype(Control,Bulk,Interrupt)

*T oken(IN,OUT ,SET UP)

*Endpointnumber

ConfigurethePipememory:

*Pipesize

*Numberofbanks

Configurethepollinginterval

forInterruptpipe

AT90USB646 Datasheet(PDF) 295 Page - ATMEL Corporation

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