SAM3SD8C Atmel Corporation, SAM3SD8C Datasheet - Page 828

• Manufacturer Part Number: SAM3SD8C
• Manufacturer: Atmel Corporation

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828
SAM3S8/SD8
SAM3S8/SD8
Figure 34-5. SD Memory Card Bus Topology
The SD Memory Card bus includes the signals listed in
Table 34-5.
Notes:
Figure 34-6. SD Card Bus Connections with One Slot
Note:
When the HSMCI is configured to operate with SD memory cards, the width of the data bus can
be selected in the HSMCI_SDCR register. Clearing the SDCBUS bit in this register means that
the width is one bit; setting it means that the width is four bits. In the case of High Speed Multi-
Media cards, only the data line 0 is used. The other data lines can be used as independent
PIOs.
Pin
Number
1
2
3
4
5
6
7
8
9
1. I: input, O: output, PP: Push Pull, OD: Open Drain.
2. When several HSMCI (x HSMCI) are embedded in a product, MCCK refers to HSMCIx_CK,
When several HSMCI (x HSMCI) are embedded in a product, MCCK refers to HSMCIx_CK,
MCCDA to HSMCIx_CDA MCDAy to HSMCIx_DAy.
MCCDA to HSMCIx_CDA, MCDAy to HSMCIx_DAy.
Name
CD/DAT[3]
CMD
VSS1
VDD
CLK
VSS2
DAT[0]
DAT[1]
DAT[2]
SD Memory Card Bus Signals
MCDA0 - MCDA3
Type
I/O/PP
PP
S
S
I/O
S
I/O/PP
I/O/PP
I/O/PP
MCCDA
MCCK
(1)
9
1
2 3 4 5 6
Card detect/ Data line Bit 3
Data line Bit 0
Data line Bit 1 or Interrupt
Data line Bit 2
Description
Command/response
Supply voltage ground
Supply voltage
Clock
Supply voltage ground
SD CARD
7 8
Table
34-5.
SD CARD
HSMCI Pin Name
(Slot z)
MCDz3
MCCDz
VSS
VDD
MCCK
VSS
MCDz0
MCDz1
MCDz2
11090A–ATARM–10-Feb-12
11090A–ATARM–10-Feb-12
(2)