SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Manual Página 29

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Industrial Grade SD Card Interface Description
SanDisk Industrial Grade SD Product Manual, Rev. 1.0 © 2003 SANDISK CORPORATION -3-3
Figure 3-1. Industrial Grade SD Card Architecture
3.2. SD Bus Topology
The SD bus has six communication lines and three supply lines:
CMD—Command is a bi-directional signal. (Host and card drivers are operating in push pull mode.)
DAT0-3—Data lines are bi-directional signals. (Host and card drivers are operating in push pull
mode.)
CLK—Clock is a host to cards signal. (CLK operates in push pull mode.)
VDD—VDD is the power supply line for all cards.
VSS[1:2]—VSS are two ground lines.
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