Rainbow Electronics AT91CAP9S250A - Manual (Page 762)

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6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
The MultiMedia Card communication is based on a 7-pin serial bus interface. It has three com-
munication lines and four supply lines.
Notes: 1. I: Input, O: Output, PP: Push/Pull, OD: Open Drain.
2. When several MCI (x MCI) are embedded in a product, MCCK refers to MCIx_CK, MCCDA
to MCIx_CDA, MCDAy to MCIx_DAy.
Figure 41-4. MMC Bus Connections (One Slot)
Note: When several MCI (x MCI) are embedded in a product, MCCK refers to MCIx_CK, MCCDA to MCIx_CDA MCDAy to MCIx_DAy.
Figure 41-5. SD Memory Card Bus Topology
Table 41-2. Bus Topology
Pin
Number
Name Type (1) Description
MCI Pin Name (2)
(Slot z)
1 RSV NC Not connected -
2 CMD I/O/PP/OD Command/response MCCDz
3 VSS1 S Supply voltage ground VSS
4 VDD S Supply voltage VDD
5 CLK I/O Clock MCCK
6 VSS2 S Supply voltage ground VSS
7 DAT[0] I/O/PP Data 0 MCDz0
2 3 4 5 6 1 7 2 3 4 5 6 1 7 2 3 4 5 6 1 7
MCCDA
MCDA0
MCCK
MMC1 MMC2 MMC3
MCI
2 3 4 5 6 1 7 8
SD CARD
9