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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8379E датащи(PDF) 49 Page - Freescale Semiconductor, Inc |
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MPC8379E датащи(HTML) 49 Page - Freescale Semiconductor, Inc |
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49 / 117 page  MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8 Freescale Semiconductor 49 This figure provides the eSDHC clock input timing diagram. Figure 29. eSDHC Clock Input Timing Diagram 11.3.1 High-Speed Output Path (Write) This figure provides the data and command output timing diagram. Figure 30. High Speed Output Path 11.3.1.1 High-Speed Write Meeting Setup (Maximum Delay) The following equations show how to calculate the allowed skew range between the SD_CLK and SD_DAT/CMD signals on the PCB. Zero clock delay: tSHSKHOV + tDATA_DELAY + tISU < tSHSCKL Eqn. 10 With clock delay: tSHSKHOV + tDATA_DELAY + tISU < tSHSCKL + tCLK_DELAY Eqn. 11 tDATA_DELAY – tCLK_DELAY < tSHSCKL – tISU – tSHSKHOV Eqn. 12 eSDHC tSHSCKR External Clock VM VM VM tSHSCK tSHSCKF VM = Midpoint Voltage (OVDD/2) operational mode tSHSCKL tSHSCKH Output valid time: tSHSKHOV Output hold time: tSHSKHOX tIH (2 ns) tCLK_DELAY Input at the SD CLK at Driving Edge Sampling edge the card Pin SD card pins tISU (6 ns) tDATA_DELAY tSHSCKL tSHSCK (clock cycle) SD CLK at the MPC8379E pin Output from the MPC8379E pins |
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