at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 592

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

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AT91SAM9G20 Preliminary
Figure 35-7. SD Card Bus Connections with Two Slots
Note:
Figure 35-8. Mixing MultiMedia and SD Memory Cards with Two Slots
Note:
When the MCI is configured to operate with SD memory cards, the width of the data bus can be
selected in the MCI_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 multimedia cards, only
the data line 0 is used. The other data lines can be used as independent PIOs.
When several MCI (x MCI) are embedded in a product, MCCK refers to MCIx_CK,MCCDA to
MCIx_CDA, MCDAy to MCIx_DAy, MCCDB to MCIx_CDB, MCDBy to MCIx_DBy.
When several MCI (x MCI) are embedded in a product, MCCK refers to MCIx_CK, MCCDA to
MCIx_CDA, MCDAy to MCIx_DAy, MCCDB to MCIx_CDB, MCDBy to MCIx_DBy.
MCDB0 - MCDB3
MCCDB
MCCDA
MCDA0
MCCK
MCDB0 - MCDB3
MCDA0 - MCDA3
MCCDA
MCCDB
MCCK
1
2 3 4 5 6
MMC1
7
SD CARD
1
2 3 4 5 6
MMC2
SD CARD 1
SD CARD 2
7
1
2 3 4 5 6
6384B–ATARM–15-Dec-08
MMC3
7