TAM-3517 HARDWARE MANUAL rev B
July 3 2012, TechNexion
52
8.2
Removable Media Interfaces – MMC/ SDIO Signals
The multimedia card high-speed/SD/SD I/O (MMC/SD/SDIO) host controller provides an
interface between a local host (LH) such as a microprocessor unit (MPU) or digital signal
processor (DSP) and either MMC, SD memory cards, or SDIO cards and handles
MMC/SD/SDIO transactions with minimal LH intervention.
The application interface manages transaction semantics. The MMC/SD/SDIO host controller
deals with MMC/SD/SDIO protocol at transmission level, data packing, adding cyclic
redundancy checks (CRC), start/end bit, and checking for syntactical correctness.
The application interface can send every MMC/SD/SDIO command and either poll for the status
of the adapter or wait for an interrupt request, which is sent back in case of exceptions or to
warn of end of operation.
The application interface can read card responses or flag registers. It can also mask individual
interrupt sources. All these operations can be performed by reading and writing control registers.
The MMC/SD/SDIO host controller also supports two DMA channels.
SIGNAL NAME
DESCRIPTION
TYPE PIN TAM-3517
MMC1 CLK
MMC/SD Output Clock
O
59
MMC1 CMD
MMC/SD command signal
IO
64
MMC1 DAT0
MMC/SD Card Data bit 0 / SPI Serial Input
IO
63
MMC1 DAT1
MMC/SD Card Data bit 1
IO
62
MMC1 DAT2
MMC/SD Card Data bit 2
IO
61
MMC1 DAT3
MMC/SD Card Data bit 3
IO
65
MMC1 DAT4
MMC/SD Card Data bit 4
IO
71
MMC1 DAT5
MMC/SD Card Data bit 5
IO
68
MMC1 DAT6
MMC/SD Card Data bit 6
IO
69
8.3
General Purpose IOs Signals Description
By using Multiplexing a maximum of
133 pins
on the module can be turned into GPIOs. By
default the following GPIOs are already acting as GPIO as first function and do not need any
software configuration.
SIGNAL NAME
DESCRIPTION
TYPE PIN TAM-3517
GPIO_137
General-purpose IO 137
IO
74
GPIO_24
General-purpose IO 24
IO
31
GPIO_26
General-purpose IO 26
IO
33
GPIO_28
General-purpose IO 28
IO
39
GPIO_29
General-purpose IO 29
IO
37
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