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Memory sdram

Discussion in 'Electronic Basics' started by Dave, Nov 15, 2003.

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  1. Dave

    Dave Guest

    Can someone explain me below memory organizations???
    Dave.

    64 Meg x 4 (16 Meg x 4 x 4 banks)
    does above ic have 64 megabytes in 16 banks or have 256 megabytes or it
    is in megabits?


    32 Meg x 8 ( 8 Meg x 8 x 4 banks)
    16 Meg x 16 ( 4 Meg x 16 x 4 banks)
     
  2. Impmon

    Impmon Guest

    Often time when I hear the term "Meg" it is in Megabit. Although it has
    4 bit addresses, it also has 4 banks so the controller could view this
    as 2 banks of 8 bit. Of course I could be wrong as some memory
    manufactures don't always have the uniform standards for reading codes.

    So 16 x 4 x 4 would be 256 Megabit or 32 Megabyte.
    Also 32 Megabyte.
    And 32 as well.
     
  3. Fabricio

    Fabricio Guest

    32 Meg x 8 ( 8 Meg x 8 x 4 banks)
    16 Meg x 16 ( 4 Meg x 16 x 4 banks)

    - PC SDRAM DIMM -

    Example:
    (capacity of the each IC) x (Nº of ICs on the module) / 8 (bits per
    byte) = Capacity of the Module in Megabytes

    32Mbits x 8 ICs / 8 = 32Mbytes (256Mbits) (Single-Sided / 1-bank)

    16Mbits x 16 ICs / 8 = 32Mbytes (256Mbits) (Double-Sided / 2-bank)

    The number of ICs per module always is a multiple of 8 (8, 16, etc)
     
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