Section 36 USB Function Controller (USBF)
Rev. 1.00 Oct. 01, 2007 Page 1582 of 1956
REJ09B0256-0100
36.10 Usage
Notes
36.10.1 Setup
Data Reception
The following points should be noted on the EP0s data register (EPDR0s) in which reception of 8-
byte setup data is performed.
1. Since the setup command must be received in the USB, writing from the USB bus side is prior
to reading from the CPU side. While the CPU reads data after completion of reception and
reception of the next setup command is started, reading from the CPU side is forcibly invalid.
Therefore a value to be read after starting reception is undefined.
2. EPDR0s must be read in 8-byte units. If reading is suspended while it is in progress, data
received in the next setup cannot be read successfully.
36.10.2 FIFO
Clear
When the USB cable is disconnected during communication, data which is receiving or
transmitting may remain in the FIFO. Therefore the FIFO must be cleared immediately after
connecting the USB cable again.
Note that the FIFO in which data is receiving from the host or transmitting to the host must not be
cleared.
36.10.3 Overreading/Overwriting of Data Register
The following points should be noted when the data register of the USBF is read from or written
to.
Receive Data Register:
The receive data register must not read data which is more than valid
receive data bytes. That is, data which is more than bytes indicated in the receive data size register
must not be read. In case of the receive data register which has the dual FIFO buffer, the
maximum number of data which can be read in a single time is maximum packet size. Write 1 to
TRG after data in the current valid buffer is read. This writing switches the FIFO buffer. Then, the
new number of bytes is reflected in the receive data size and the next data can be read.
Transmit Data Register:
The transmit data register must not write data which is more than
maximum packet size. In case of the transmit data register which has the dual FIFO buffer, the
maximum number of data which can be written in a single time is maximum packet size. Write 1
to TRG/PKTE after data is written. This writing switches the FIFO buffer. Then, the next data can
be written to another buffer. Therefore data must not be written in both buffers in a single time.
Содержание SH7763
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Страница 144: ...Section 3 Instruction Set Rev 1 00 Oct 01 2007 Page 78 of 1956 REJ09B0256 0100 ...
Страница 170: ...Section 4 Pipelining Rev 1 00 Oct 01 2007 Page 104 of 1956 REJ09B0256 0100 ...
Страница 282: ...Section 7 Caches Rev 1 00 Oct 01 2007 Page 216 of 1956 REJ09B0256 0100 ...
Страница 378: ...Section 9 Interrupt Controller INTC Rev 1 00 Oct 01 2007 Page 312 of 1956 REJ09B0256 0100 ...
Страница 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
Страница 630: ...Section 13 PCI Controller PCIC Rev 1 00 Oct 01 2007 Page 564 of 1956 REJ09B0256 0100 ...
Страница 686: ...Section 14 Direct Memory Access Controller DMAC Rev 1 00 Oct 01 2007 Page 620 of 1956 REJ09B0256 0100 ...
Страница 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
Страница 732: ...Section 17 Watchdog Timer and Reset WDT Rev 1 00 Oct 01 2007 Page 666 of 1956 REJ09B0256 0100 ...
Страница 752: ...Section 18 Power Down Mode Rev 1 00 Oct 01 2007 Page 686 of 1956 REJ09B0256 0100 ...
Страница 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Страница 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
Страница 1060: ...Section 23 Gigabit Ethernet Controller GETHER Rev 1 00 Oct 01 2007 Page 994 of 1956 REJ09B0256 0100 ...
Страница 1062: ...Section 24 IP Security Accelerator SECURITY Rev 1 00 Oct 01 2007 Page 996 of 1956 REJ09B0256 0100 ...
Страница 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Страница 1184: ...Section 27 Serial Communication Interface with FIFO SCIF Rev 1 00 Oct 01 2007 Page 1118 of 1956 REJ09B0256 0100 ...
Страница 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Страница 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Страница 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Страница 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
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