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66AK2G12: DDR3L connection

Snir Rahamim
Prodigy 140 points
Part Number: 66AK2G12


Hello,

I'm designing a new project with 66AK2G12 1GHZ processor. in the spec the max. size of the EMIF DDR is 4GB.

I'll like to connect 4GB DDR3L with ECC. I thought about connect two 2GB 16bit chips and one 8 bit 2GB for ECC.

I checked the EVM of this chip, the design was with 4 chips of 4GB of 8 bit and one chip of 4GB 8 bit for ECC. I'm not sure why is that, I'll like to know if my design is correct.

Regards,
Snir

  • 0
    TI__Guru**** 161600 points

    Hi.

    I'll like to connect 4GB DDR3L with ECC. I thought about connect two 2GB 16bit chips and one 8 bit 2GB for ECC.

    See Table Table7-2. Supported DDR3L Device Combinations and Figure7-2. 32-Bit, One-Bank DDR EMIF Interface Schematic Using Two 16-Bit DDR3L Devices.

    Also 7.2.1 EMIF Overview, The controller supports:
      • 32-bitSDRAMdatabus width with 4-bitECC:

            – 36-bit: 5x8-bit SDRAMs (32 bits for data and 4 bits for ECC, not used bits should be tied-off)

            – 36-bit: 3x16- bit SDRAMs (32 bits for data and 4 bits for ECC, not used bits should be tied-off)

    The EVM uses the first configuration 5x8-bit SDRAMs (32 bits for data and 4 bits for ECC,not used bits should be tied-off). 

    You could use the second option (which matches your use case): 36-bit: 3x16- bit SDRAMs (32 bits for data and 4 bits for ECC, not used bits should be tied-off).

    Best Regards,
    Yordan

  • 0 in reply to Yordan Kovachev
    Prodigy 140 points

    Hi Yordan,

    Thanks, I'll like to use the 2nd configuration of 3x16 Bit.

    Can I use 3 devices of 2GB for total of 4GB?

    Regards,
    Snir