Rainbow Electronics AT91CAP9S250A - Manual (Page 761)

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6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
41.4 Pin Name List
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.
41.5 Product Dependencies
41.5.1 I/O Lines
The pins used for interfacing the MultiMedia Cards or SD Cards may be multiplexed with PIO
lines. The programmer must first program the PIO controllers to assign the peripheral func-
tions to MCI pins.
41.5.2 Power Management
The MCI may be clocked through the Power Management Controller (PMC), so the program-
mer must first configure the PMC to enable the MCI clock.
41.5.3 Interrupt
The MCI interface has an interrupt line connected to the Advanced Interrupt Controller (AIC).
Handling the MCI interrupt requires programming the AIC before configuring the MCI.
41.6 Bus Topology
Figure 41-3. Multimedia Memory Card Bus Topology
Table 41-1. I/O Lines Description
Pin Name (2) Pin Description Type (1) Comments
MCCDA Command/response I/O/PP/OD CMD of an MMC or SDCard/SDIO
MCCK Clock I/O CLK of an MMC or SD Card/SDIO
MCDA0 - MCDA3 Data 0..3 of Slot A I/O/PP
DAT0 of an MMC
DAT[0..3] of an SD Card/SDIO
2 3 4 5 6 1 7
MMC