Section 23
USB 2.0 Host/Function Module (USB)
Rev. 0.50 May 18, 2006 Page 1189 of 1588
REJ09B0313-0050
After the interval counter has been initialized, the counter is started under the following conditions
1 or 2 when a packet has been transferred normally.
1. An SOF is received following transmission of data in response to an IN token, in the PID =
BUF state.
2. An SOF is received after data following an OUT token is received in the PID = BUF state.
The interval counter is not initialized under the conditions noted below.
1. When the PID bit is set to NAK or STALL
The interval timer does not stop. This module attempts the transactions at the subsequent
interval.
2. The USB bus reset or the USB is suspended
The IITV bit is not initialized. When the SOF has been received, the counter is restarted from
the value prior to the reception of the SOF.
(4) Setup of Data to be Transmitted using Isochronous Transfer when the Function
Controller Function is Selected
With isochronous data transmission using this module in function controller function, 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 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, this
module 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 23.14 shows an example of transmission using the isochronous transfer transmission data
setup function with this module, when IITV = 0 (every frame) has been set. Sending of a zero-
length packet is displayed in the figure as Null, in a shaded box.
Содержание Single-Chip Microcomputer SH7203
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Страница 696: ...Section 13 Watchdog Timer WDT Rev 0 50 May 18 2006 Page 666 of 1588 REJ09B0313 0050 ...
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Страница 796: ...Section 15 Serial Communication Interface with FIFO SCIF Rev 0 50 May 18 2006 Page 766 of 1588 REJ09B0313 0050 ...
Страница 876: ...Section 17 I2 C Bus Interface 3 IIC3 Rev 0 50 May 18 2006 Page 846 of 1588 REJ09B0313 0050 ...
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Страница 1054: ...Section 21 D A Converter DAC Rev 0 50 May 18 2006 Page 1024 of 1588 REJ09B0313 0050 ...
Страница 1226: ...Section 23 USB 2 0 Host Function Module USB Rev 0 50 May 18 2006 Page 1196 of 1588 REJ09B0313 0050 ...
Страница 1294: ...Section 24 LCD Controller LCDC Rev 0 50 May 18 2006 Page 1264 of 1588 REJ09B0313 0050 ...
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Страница 1598: ...Section 31 Electrical Characteristics Rev 0 50 May 18 2006 Page 1568 of 1588 REJ09B0313 0050 ...
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