memory

Discussion in 'VHDL' started by Mariusz, Dec 8, 2003.

  1. Mariusz

    Mariusz Guest

    Hello,
    I'm new on this group and I'm complete rookie in vhdl ;)
    I have to create model of memory in vhdl for spartan II card. It should
    contain 20480x3 of memory. As far as i know spartan have few memory block's
    but it's only about 56k, while i need approximately 60kb. I know that i can
    use LUT to simulate some memory but i don't know how. I also know that i
    have to use some multiplexer and demultiplexer to convert memory addresses
    to two parts - one for normal memory and second for LUT memory. Can somebody
    help me with this? Maybe some examples or links. How can i use LUT to
    simulate memory and how can i connect this two different memory into one
    logical memory?

    --
    Regards
    M
    Mariusz, Dec 8, 2003
    #1
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  2. Mariusz

    Jim Wu Guest

    > I know that i can
    > use LUT to simulate some memory but i don't know how. I also know that i
    > have to use some multiplexer and demultiplexer to convert memory addresses
    > to two parts - one for normal memory and second for LUT memory. Can

    somebody
    > help me with this? Maybe some examples or links.


    http://www.xilinx.com/bvdocs/appnotes/xapp464.pdf

    > how can i connect this two different memory into one
    > logical memory?


    Use one-bit of address as chip-select/enable to select either the block RAM
    or distributed RAM..

    Jim Wu
    (remove capital letters)
    http://www.geocities.com/jimwu88/chips
    Jim Wu, Dec 9, 2003
    #2
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