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參數(shù)資料
| 型號： | M66596WG |
| 元件分類： | 總線控制器 |
| 英文描述： | UNIVERSAL SERIAL BUS CONTROLLER, PBGA64 |
| 封裝： | 0.80 MM PITCH, FBGA-64 |
| 文件頁數(shù)： | 131/133頁 |
| 文件大小： | 1611K |
| 代理商： | M66596WG |
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M66596FP/WG
rev .1.00
2006.3.14
page 95 of 127
3.9.4
Setup of data to be transmitted using isochronous transfer in the Peripheral mode.
With isochronous data transmission using this controller at Peripheral mode, after data has been written to the
buffer memory, a data packet can be sent with the next frame in which an SOF packet is detected. This function is
called the isochronous transfer transmission data setup function, and it makes it possible to designate the frame
from which transmission began.
If a double buffer is being used for the buffer memory, transmission will be enabled for only one of the two buffers
even after the writing of data to both buffers has been completed, that buffer memory being the one to which the
data writing was completed first. For this reason, even if multiple IN tokens are received, the only buffer memory
that can be sent is one packet’s worth of data.
When an IN token is received, if the buffer memory is in the transmission enabled state, the controller transmits
the data. If the buffer memory is not in the transmission enabled state, however, a Zero-Length packet is sent and an
underrun error occurs.
Figure 3.26 shows an example of transmission using the isochronous transfer transmission data setup function
with the controller, when “IITV=0 (every frame)” has been set. Sending of a Zero-Length packet is displayed in the
illustration as “Null”, in a shaded box.
Transmission enabled state
Buffer A
Buffer B
Writing completed
Empty state
IN
Buffer A
Buffer B
Null
IN
Data-A
IN
Data-B
IN
Buffer A
Buffer B
Null
IN
Data-A
IN
Data-B
IN
Null
Transmission enabled state
Writing in
progress
Writing completed
Empty state
IN
Null
Empty state
IN
Buffer A
Buffer B
Empty state
Data-A
Received token
Sent packet
Received token
Send packet
Received token
Send packet
SOF packet
Writing in
progress
Empty state
Writing in
progress
Transmission enabled state
Empty state Writing in
progress
Writing completed
Transmission
enabled state
Empty state
Writing in
progress
Writing completed
Empty state
Writing in
progress
Writing completed
Transmission
enabled state
Empty state
Writing in
progress
Writing completed
Transmission
enabled state
Empty state
Writing in
progress
Writing completed
Empty state
Writing in
progress
Writing completed
Transmission
enabled state
Empty state
Figure 3.26 Example of data setup function operation
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