Rainbow Electronics AT91CAP9S250A User Manual
Page 762
762
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