SanDisk SD Card
SanDisk SD Card
SanDisk SD Card
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Revision 2.2Chapter 3 – <strong>SD</strong> <strong>Card</strong> Interface Description<strong>SD</strong> <strong>Card</strong> Product Manual3.2 <strong>SD</strong> Bus TopologyThe <strong>SD</strong> Memory <strong>Card</strong> bus has six communication lines and three supply lines.• CMD• DAT0-3• CLK• VDD• VSS[1:2]The description of each signal is contained in Table 3-3.Table 3-3NameCMDDAT0-3CLKV DDV SS [1:2]MMC Bus Signal DescriptionsDescriptionCommand is a bi-directional signal. Host and card drivers are operating in pushpullmode.Data lines are bi-directional signals. Host and card drivers are operating in pushpullmode.Clock is a host to card signal. CLK operates in push-pull mode.Power supply line for all cards.Two ground lines.Figure 3-2 shows the bus topology of several cards with one host in <strong>SD</strong> Bus mode.Figure 3-2<strong>SD</strong> <strong>Card</strong> System Bus TopologyHOSTCLKVddVssD0-3(A),CMD(A)CLKVddVssD0-D3, CMD<strong>SD</strong> Memory<strong>Card</strong> (A)D0-3(B),CMD(B)CLKVddVssD0-D3, CMD<strong>SD</strong> Memory<strong>Card</strong> (B)D0-3(C)CMD(C)CLKVddVssD0, CS, CMDMultiMedia<strong>Card</strong>(C)D1&D2 NotConnected© 2004 <strong>SanDisk</strong> Corporation 3-3 12/08/04
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