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AM6442: Support of LPDDR4 SDRAM

Rico
Prodigy 40 points
Part Number: AM6442


Tool/software:

I am new in the field of processor and its RAM memory. And I want to know if it es possible to connect the LPDDR4 SDRAM MT53E512M32D1 (Micron) to the Sitara AM64. It is a 16 Gbit RAM / 1 die / dual channel. Is possible the series-connection as proposed in https://www.jedec.org/sites/default/files/files/Marc_Greenberg_Mobile_and_IOT.pdf, page 9 ? I am unsettled because in the TRM AM64x/AM243x Technical Reference Manual (Rev. H,  Chapter 8.1.1, there is following: DDRSSO supports memory bus features: up to 2 ranks and SDRAM address range up to 8 GByte and contrarily in chapter 8.1.1.1, there is: DDRSS0 does not support the following: only 1 rand designs are supported and only address range of up to 2 GBytes is supported. Can you resolve this contradiction. 

The app-note AM64x/AM243x DDR Board Design and Layout Guidelines (Rev. A) make following limitations (table 3-2): one channel, one rank, one die, one device. In this case the LPDDR4 SDRAM MT53E512M32D1 cannot be applied. Is this true?

Thank you for your help

Ricardo

  • +1
    TI__Guru* 88170 points

    Hi Ricardo, AM64x only supports 1 channel (ie x16 data) and one rank.  The discrepancy in the TRM is there because the DDRSS hardware module supports 2 ranks, but as implemented in AM64x, it is limited to only one rank, and the address range is also limited to 2GBytes.  These are just design limitations for the AM64x, other devices (AM62x, AM62Ax, etc), do not have some of these limitations.

    So the memory you cite will not work because it is x32 data (2 channels).  It also appears to be a LPDDR4X device (0.6V IO voltage).  The AM64x only supports LPDDR4 (1.1V IO voltage)

    One example from Micron that you could use is MT53E1G16D1FW

    Regards,

    James