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USB3813 数据表(PDF) 64 Page - SMSC Corporation |
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USB3813 数据表(HTML) 64 Page - SMSC Corporation |
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64 / 68 page  USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications Datasheet Revision 1.0 (06-17-13) 64 SMSC USB3813 DATASHEET 9.5.7 SPI Timing The following specifies the SPI timing requirements for the device. Note: The SPI can be configured for 30 MHz or 60 MHz operation via the SPI_SPD_SEL configuration strap. 30 MHz operation timing values are shown in Table 9.7. 60 MHz operation timing values are shown in Table 9.8. Figure 9.4 SPI Timing Table 9.7 SPI Timing Values (30 MHz Operation) SYMBOL DESCRIPTION MIN TYP MAX UNITS tfc Clock frequency 30 MHz tceh Chip enable (SPI_CE_EN) high time 100 ns tclq Clock to input data 13 ns tdh Input data hold time 0 ns tos Output setup time 5 ns toh Output hold time 5 ns tov Clock to output valid 4 ns tcel Chip enable (SPI_CE_EN) low to first clock 12 ns tceh Last clock to chip enable (SPI_CE_EN) high 12 ns SPI_CLK SPI_DI SPI_DO SPI_CE_N tcel tfc tclq tceh tdh toh tos tov toh |
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