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SRAM types, please help !

Discussion in 'Electronic Basics' started by Kroko, Feb 1, 2004.

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  1. Kroko

    Kroko Guest

    Hello !

    I am using a 628128 128K static ram. It has the control
    line /WE /OE /CS1 and CS2. I have tied /OE and /CS1 to
    ground. To control writing and reading I use /WE and CS2.
    This works very well, no problem. I also select and deselect
    the chip with CS2.

    But I now changed the RAM type and am using a V62C518256LL
    32K SRAM, because it has only 28 pins and I need space on
    the board.

    Unfortunately it doesnt have a CS2 but only /WE /OE and /CE

    I thought it would be easy to modify my ram access to use this
    chip, but it doesnt work:

    I tied /CE to ground and use /WE as before. I use the same signal
    as for CS2 to control the /OE line, just inverted.

    Well, it doesn't work....

    Do you have any ideas, why this is so ?

  2. George

    George Guest

    I'm not sure why your solution doesn't work, but I would simply tie
    /OE to low and send the inverted CS2 to the /CE.
  3. John Larkin

    John Larkin Guest

    Tie /OE low and drive /CE with the active-low chip select.

  4. Kroko

    Kroko Guest

    Thank you, I have also tried this when the other solution didn't work,
    but it still didn't work :-(. Are there other important differences
    between the chips I am using ?

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