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TMS320C6655: 8GB DDR3 configuration

Part Number: TMS320C6655

hi, TI

I am wondering DDR3 design with 8GB of addressalbe memory space.

80000000 FFFFFFFF 8 00000000 8 7FFFFFFF 2G DDR3 EMIF data(2)

(2) The memory map only shows the default MPAX configuration of DDR3 memory space. For the extended DDR3 memory space access (up to 8GB), see the MPAX configuration details in C66x CorePac User's Guide and Multicore Shared Memory Controller (MSMC) for KeyStone Devices User's Guide in Section 10.3.

DDRD[31:0] / DDRA[15:0] / DDRCE[1:0] / DDRBA[2:0]

in datasheet

how to configurate DDR3 8GB?

row address 16bit / column address 11bit / 8bank / data bus 32bit = 4GB

4GB * chipset 2 = 8GB

Is the above mentioned correct?

But DDR3 EMIF data in datasheet has 2GB memory space. 

the C6655 supports max 2GB memory space?

Please let me know how to configure DDR3 8GB 


  • Hi,

    No, see Section 1.1 Features in the device datasheet:
    32-BitDDR3Interface
    • DDR3-1333
    • 8GB of Addressable Memory Space

    However to achieve the maximum supported 8GB of addressable memory space you need to configure the address expansion (MPAX).

    Best Regards,
    Yordan