AT90USB1286-16MU ATMEL [ATMEL Corporation], AT90USB1286-16MU Datasheet - Page 298

• Manufacturer Part Number: AT90USB1286-16MU
• Description: Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
• Manufacturer: ATMEL [ATMEL Corporation]

23.14 IN Pipe management
298
AT90USB64/128
If the OUT Pipe is composed of multiple banks, this also switches to the next data bank. The
TXOUT and FIFOCON bits are automatically updated by hardware regarding the status of the
next bank.
The Pipe must be configured first.
When the Host requires data from the device, the firmware has to determine first the IN mode to
use using the INMODE bit:
The IN request generation will start when the firmware clear the PFREEZE bit.
• INMODE = 0. The INRQX register is taken in account. The Host controller will perform
• INMODE = 1. The USB controller will perform infinite IN request until the firmware freezes the
(INRQX+1) IN requests on the selected Pipe before freezing the Pipe. This mode avoids to
have extra IN requests on a Pipe.
Pipe.
Example with 1 OUT data bank
Example with 2 OUT data banks
Example with 2 OUT data banks
TXOUT
FIFOCON
TXOUT
FIFOCON
TXOUT
FIFOCON
SW
SW
SW
write data from CPU
write data from CPU
write data from CPU
BANK 0
BANK 0
BANK 0
SW
SW
SW
OUT
OUT
OUT
SW
SW
write data from CPU
write data from CPU
(bank 0)
DATA
BANK 1
BANK 1
(bank 0)
(bank 0)
DATA
DATA
ACK
HW
SW
HW
HW
ACK
ACK
SW
OUT
SW
SW
SW
write data from CPU
OUT
write data from CPU
write data from CPU
(bank 1)
DATA
BANK 0
BANK0
BANK0
ACK
(bank 1)
DATA
SW
OUT
7593A–AVR–02/06
ACK