TMS320DM355 datasheet(112/154 Pages) TI

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5.7.2

DDR2/mDDR Memory Controller

5.7.2.1 DDR2/mDDR Memory Controller Electrical Data/Timing

TMS320DM355

Digital Media System-on-Chip (DMSoC)

SPRS463D – SEPTEMBER 2007 – REVISED FEBRUARY 2008

The DDR2 / mDDR Memory Controller is a dedicated interface to DDR2 / mDDR SDRAM. It supports

JESD79D-2A standard compliant DDR2 SDRAM devices and compliant Mobile DDR SDRAM devices.

DDR2 / mDDR SDRAM plays a key role in a DM355-based system. Such a system is expected to require

a significant amount of high-speed external memory for all of the following functions:

• Buffering of input image data from sensors or video sources

• Intermediate buffering for processing/resizing of image data in the VPFE

• Numerous OSD display buffers

• Intermediate buffering for large raw Bayer data image files while performing image processing

functions

• Buffering for intermediate data while performing video encode and decode functions

• Storage of executable code for the ARM

The DDR2 / mDDR Memory Controller supports the following features:

• JESD79D-2A standard compliant DDR2 SDRAM

• Mobile DDR SDRAM

• 256 MByte memory space

• Data bus width 16 bits

• CAS latencies:

–

DDR2: 2, 3, 4, and 5

–

mDDR: 2 and 3

• Internal banks:

–

DDR2: 1, 2, 4, and 8

–

mDDR: 1, 2, and 4

• Burst length: 8

• Burst type: sequential

• 1 CS signal

• Page sizes: 256, 512, 1024, and 2048

• SDRAM autoinitialization

• Self-refresh mode

• Partial array self-refresh (for mDDR)

• Power down mode

• Prioritized refresh

• Programmable refresh rate and backlog counter

• Programmable timing parameters

• Little endian

For details on the DDR2 Memory Controller, refer to TMS320DM35x Digital Media System-on-Chip

(DMSoC) DDR2/mDDR Memory Controller Reference Guide (literature number SPRUEH7).

The Implementing DDR2/mDDR PCB Layout on the TMS320DM35x DMSoC Application Report (literature

number SPRAAR3) specifies a complete DDR2 and mDDR interface solution for the DM355 as well as a

list of compatible DDR2/mDDR devices. TI has performed the simulation and system characterization to

ensure all DDR2 and mDDR interface timings in this solution are met.

TI only supports board designs that follow the guidelines outlined in the Implementing DDR2/mDDR PCB

Layout on the TMS320DM35x DMSoC Application Report (literature number SPRAAR3).

DM355 Peripheral Information and Electrical Specifications

112

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