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DM8168: Maximum possible DDR throughput

Hi,

We are working on a use case study on DM8168 and would like to know what is the maximum DDR throughput possible on DM8168. Our understanding is as below

Total Available BW = Clock x 2 x bus width x no of interfaces = 400MHz (maximum supported by DMM and DDR controller) x 2 (for DDR3 dual rate) x 32 bits (maximum bus width supported by DMM and DDR controller) x 2 ( two EMIF interfaces)

= 6.4GBps

Is this understanding correct? or Is there any way we can get better throughput?

Thanks in advance.

Regards

Sayanna