Section 23
USB 2.0 Host/Function Module (USB)
Rev. 0.50 May 18, 2006 Page 1165 of 1588
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23.4.4 Buffer
Memory
(1) Buffer Memory Allocation
Figure 23.9 shows an example of a buffer memory map for this module. The buffer memory is an
area shared by the CPU and this module. In the buffer memory status, there are times when the
access right to the buffer memory is allocated to the user system (CPU side), and times when it is
allocated to this module (SIE side).
The buffer memory sets independent areas for each pipe. In the memory areas, 64 bytes comprise
one block, and the memory areas are set using the first block number of the number of blocks
(specified using the BUFNMB and BUFSIZE bits in PIPEBUF). Moreover, three FIFO ports are
used for access to the buffer memory (reading and writing data). A pipe is assigned to the FIFO
port by specifying the pipe number using the CURPIPE bit in C/DnFIFOSEL.
The buffer statuses of the various pipes can be confirmed using the BSTS bit in DCPCTR and the
INBUFM bit in PIPEnCTR. Also, the access right of the FIFO port can be confirmed using the
FRDY bit in C/DnFIFOCTR.
Содержание Single-Chip Microcomputer SH7203
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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 ...
Страница 1386: ...Section 26 I O Ports Rev 0 50 May 18 2006 Page 1356 of 1588 REJ09B0313 0050 ...
Страница 1512: ...Section 30 List of Registers Rev 0 50 May 18 2006 Page 1482 of 1588 REJ09B0313 0050 ...
Страница 1598: ...Section 31 Electrical Characteristics Rev 0 50 May 18 2006 Page 1568 of 1588 REJ09B0313 0050 ...
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