at85c51snd3 ATMEL Corporation, at85c51snd3 Datasheet - Page 132

• Manufacturer Part Number: at85c51snd3
• Description: At85c51snd3 Single-chip Digital Audio Decoder - Encoder With Usb 2.0 Interface
• Manufacturer: ATMEL Corporation

“Manual” Mode
132
AT85C51SND3B
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
The TXOUT bit is set by hardware when the current bank becomes free. This triggers an
interrupt if the TXOUTE bit is set. The FIFOCON bit is set at the same time. The CPU
writes into the FIFO and clears the FIFOCON bit to allow the USB controller to send the
data. 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.
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
OUT
write data from CPU
write data from CPU
write data from CPU
(bank 1)
DATA
BANK 0
BANK0
BANK0
ACK
(bank 1)
DATA
7632D–MP3–01/07
SW
OUT
ACK