AT90USB646 datasheet(299/456 Pages) ATMEL

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299

7593L–AVR–09/12

AT90USB64/128

• 7 - CFGOK - Configure Pipe Memory OK

Set by hardware if the required memory configuration has been successfully performed.

Cleared by hardware when the pipe is disabled. The USB reset and the reset pipe have no effect

on the configuration of the pipe.

• 6 - OVERFI - Overflow

Set by hardware when a the current Pipe has received more data than the maximum length of

the current Pipe. An interrupt is triggered if the FLERRE bit is set.

Shall be cleared by software. Setting by software has no effect.

• 5 - UNDERFI - Underflow

Set by hardware when a transaction underflow occurs in the current isochronous or interrupt

Pipe. The Pipe can’t send the data flow required by the device. A ZLP will be sent instead. An

interrupt is triggered if the FLERRE bit is set.

Shall be cleared by software. Setting by software has no effect.

Note: the Host controller has to send a OUT packet, but the bank is empty. A ZLP will be sent

and the UNDERFI bit is set.

• 4 - Reserved

The value read from these bits is always 0. Do not set these bits.

• 3-2 - DTSEQ1:0 - Toggle Sequencing flag

Set by hardware to indicate the PID data of the current bank:

00b

Data0

01b

Data1

1xb

Reserved.

For OUT Pipe, this value indicates the next data toggle that will be sent. This is not relative to the

current bank.

For IN Pipe, this value indicates the last data toggle received on the current bank.

• 1-0 - NBUSYBK1:0 - Busy Bank flag

Set by hardware to indicate the number of busy bank.

For OUT Pipe, it indicates the number of busy bank(s), filled by the user, ready for OUT transfer.

For IN Pipe, it indicates the number of busy bank(s) filled by IN transaction from the Device.

00b

All banks are free

01b

1 busy bank

10b

2 busy banks

11b

Reserved.

Bit

765

3210

CFGOK

OVERFI

UNDERFI

DTSEQ1:0

NBUSYBK

UPSTAX

Read/write

RRRR

Initial value

000

0000

AT90USB646 Datasheet(PDF) 299 Page - ATMEL Corporation

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