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Altera_Forum
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21 years ago

problem with sdram

hi

i built my own board with a EP1C20 and flash and the sdram (MT48LC4M32B2 -7).

i use the nios I and i don't manage to work properly with the sdram.

When i write at the adress 0 i read the value at the adress 0x0 and 0x2 and 0x100 0x102 0x800 0x802 0x900 0x902 and 0x2000 and so on.

I verified many tilmes all my pin out.

the sdram is not close from the the FPGA.

there is no influence when i change the phase shift of the sram_clk(50MHz).

Is there a knew problem with sdram controler and nios I?

I need some help!!!!

thanks

benjamin

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    21 years ago

    --- Quote Start ---

    originally posted by benjamin@Sep 30 2005, 04:42 AM

    hi

    i built my own board with a ep1c20 and flash and the sdram (mt48lc4m32b2 -7).

    i use the nios i and i don't manage to work properly with the sdram.

    when i write at the adress 0 i read the value at the adress 0x0 and 0x2 and 0x100 0x102 0x800 0x802 0x900 0x902 and 0x2000 and so on.

    i verified many tilmes all my pin out.

    the sdram is not close from the the fpga.

    there is no influence when i change the phase shift of the sram_clk(50mhz).

    is there a knew problem with sdram controler and nios i?

    i need some help!!!!

    thanks

    benjamin

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    --- quote end ---

    --- Quote End ---

    hi sir..

    i am working on EPIC6 board and want to access the sdram thru both s/w(c-prog)

    and h/w(custom instr).what should i do to access the sdram..

    i have seen an eg. in which EXPORT ports from the CPU were used to access the LEDs so should i do the same to access the sdram...plz suggest the way u have accessed the sdram.

    byeeeee