Texas Instruments OMAP5912 Reference Manual page 16

Overview
1.2 SDRAM/DDRAM Memory Interface
1.3 Synchronous/Asynchronous Burst Memory Interface
1.4 CompactFlash
1.5 Other Memory Types
16 Introduction
The OMAP5912 external memory interface fast (EMIFF) is an synchronous
dynamic RAM (SDRAM) controller that manages all accesses by the various
initiators of an OMAP system. It can support one 16-bit device or two 8-bit
devices. The external interface data bus width is always 16 bits.
The following devices are supported:
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Standard single-data-rate SDRAM
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Low-power single-data-rate SDRAM (mobile SDRAM)
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Standard double-data-rate SDRAM (DDRAM)
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Low-power double-data-rate SDRAM (mobile DDRAM)
In terms of capacity and organization of the memory components that can be
attached, the EMIFF can handle:
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1G-bit, 512M-bit, 256M-bit, 128M-bit, 64M-bit, and 16M-bit devices
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2-bank or 4-bank devices for 16M-bit or 64M-bit devices
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4-bank devices only for any other capacity
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x8 (two devices) or x16 (single device) data bus configuration, except for
the 1G-bit device. The EMIFF supports only two x8, 512M-bit devices and
a single x16, 1G-bit device (128 megabytes, maximum memory
configuration).
The synchronous/asynchronous external memory interface slow (EMIFS)
supports most common memory interface protocols through flexible
programming and timing signals control.
The EMIFS controls up to six devices without adding any external logic through
six independent chip-selects (CSs) and through dedicated memory interface
control signals. Two configurable options are supported:
OMAP5912 supports CompactFlash with a dedicated compact flash
controller.
OMAP5912 includes multiple serial interfaces that can be used to connect
multiple types of memories, including:
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Up to two multimedia cards through the multimedia memory card
interfaces (MMC/SDIO)
SPRU748A