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SMS01GAF Datasheet(PDF) 26 Page - Numonyx B.V

Part # SMS01GAF
Description  64 MByte, 128 MByte, 256 MByte 512 MByte and 1 GByte, 3.3V Supply Secure Digital??Card
PDF  61 Pages
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Manufacturer  NUMONYX [Numonyx B.V]
Direct Link  http://www.numonyx.com
Logo NUMONYX - Numonyx B.V

SMS01GAF Datasheet(HTML) 26 Page - Numonyx B.V

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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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