AT90USB646 datasheet(287/456 Pages) ATMEL

287 / 456 page

287

7593L–AVR–09/12

AT90USB64/128

Figure 24-3. 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 one 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 refer to “Memory management” on page 252 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 eight bytes of the Device Descriptor sending a GET_DESCRIPTOR

request. These bytes contains the MaxPacketSize of the Device default control endpoint and the

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

Pipe

Activ ation

UPCONX

PENABLE=1

UPCFG0X

PTYPE

PTOKEN

PEPNUM

CFGOK=1

ERROR

Yes

UPCFG2X

INTFRQ

(interruptonly)

Pipeactiv ated

and f reezed

UPCFG1X

PSIZE

PBK

CFGMEM

Enablethepipe

SelectthePipetype:

*Type(Control,Bulk,Interrupt)

*Token(IN,OUT,SETUP)

*Endpointnumber

ConfigurethePipememory:

*Pipesize

*Numberofbanks

Configurethepollinginterval

forInterruptpipe

AT90USB646 Datasheet(PDF) 287 Page - ATMEL Corporation

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