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SMS01GAF bảng dữ liệu(PDF) 26 Page - Numonyx B.V |
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SMS01GAF bảng dữ liệu(HTML) 26 Page - Numonyx B.V |
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26 / 61 page ![]() SD memory card hardware interface SMSxxxAF, SMSxxxFF, SMSxxxBF 26/61 4 SD memory card hardware interface 4.1 SD memory card bus circuitry Figure 13 shows the internal bus circuitry required for the Full Size SD Memory Card. The SD Memory Card may also feature two additional contacts, that are not part of the internal circuitry. When present in the device, these contacts are located at the level of the Write Protect/Card Detect switch in the socket, and should be connected as illustrated in Figure 13. When DAT3 is used for card detection, the RDAT resistor connected to DAT3 should be disconnected and another resistor should be connected to Ground. RDAT and RCMD are pull-up resistors used to protect the DAT and CMD lines, respectively, against bus floating when no card is inserted or when all card drivers are high impedance. RWP is used to protect the Write Protect/Card Detection switch. Figure 13. Full Size SD Memory Card Circuitry SD Memory Card Host SD Memory Card 9 12345678 CLK DAT0-DAT3 CMD Write Protect RDAT RCMD RWP C1 C2 C3 VDD VDD VDD VSS ai10042 |
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