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USB3613 数据表(PDF) 30 Page - Microchip Technology |
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USB3613 数据表(HTML) 30 Page - Microchip Technology |
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30 / 57 page  USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications Datasheet DS00001714A-page 30 2014 Microchip Technology Inc. Automatic reads and writes happen when there is an external XDATA read or write, using the serial stream that has been previously discussed. 7.1.5 Erase Example To perform a SCTR_ERASE, 32BLK_ERASE, or 64BLK_ERASE, the device writes 0x20, 0x52, or 0xD8, respectively to the first byte of the command buffer, followed by a 3-byte address. The length of the transfer is set to 4 bytes. To perform this, the device drives SPI_CE_N low, then counts out 8 clocks. It then outputs on SPI_DO the 8 bits of command, followed by 24 bits of address of the location to be erased. When the transfer is complete, SPI_CE_N goes high, while the SPI_DI line is ignored in this example. Figure 7.3 SPI Erase Sequence SPI_CE_N SPI_CLK 16 23 24 31 15 12 3 4 05 7 6 ADD. SPI_DO SPI_DI 8 Command MSB MSB ADD. ADD. HIGH IMPEDANCE |
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