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Open Rex - DDR3 Memory Address

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  • robertferanec
    replied
    I wonder why open rex use all 16 address lines for DDR3 interface, cause as I read in Micron 4Gb DDR3 Addressing it said for 256Mx16 row addressing is A[14:0] and column addressing is A[9:0].
    - It is there to support 8Gb memory chips: http://www.voipac.com/#iMX6-SBC-532441111

    And why the termination resistor of address, command and control is 47 ohm.
    - this was taken from reference schematic

    Leave a comment:


  • justaelvis
    started a topic Open Rex - DDR3 Memory Address

    Open Rex - DDR3 Memory Address

    Hi Robert,
    I wonder why open rex use all 16 address lines for DDR3 interface, cause as I read in Micron 4Gb DDR3 Addressing it said for 256Mx16 row addressing is A[14:0] and column addressing is A[9:0].
    And why the termination resistor of address, command and control is 47 ohm.
    Thank you!
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