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Atmel AT28C256 32K SRAM Expansion Driver — Parallax Forums

Atmel AT28C256 32K SRAM Expansion Driver

Vega256Vega256 Posts: 197
edited 2011-03-19 11:08 in Propeller 1
Hey Guys,

Is there a driver that allows the Propeller to read and write to Atmel AT28C256 32K SRAM modules?

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2011-03-18 15:36
    It is not the same SRAM as used in the C3. It's a parallel SRAM and there are no drivers available. It should be easy to make your own, but none exist yet. The C3's SRAM is a serial SPI SRAM, the 23K256 ... very different. When in doubt, read the datasheet. That's what I did to answer the question.
  • David BetzDavid Betz Posts: 14,516
    edited 2011-03-18 16:07
    Mike Green wrote: »
    It is not the same SRAM as used in the C3. It's a parallel SRAM and there are no drivers available. It should be easy to make your own, but none exist yet. The C3's SRAM is a serial SPI SRAM, the 23K256 ... very different. When in doubt, read the datasheet. That's what I did to answer the question.
    Sorry for providing useless information. I've deleted my bogus post. I guess I should let the experts answer in the future.
  • Vega256Vega256 Posts: 197
    edited 2011-03-19 06:52
    David Betz wrote: »
    Sorry for providing useless information. I've deleted my bogus post. I guess I should let the experts answer in the future.
    Hey, don't worry about it; you were just trying to help. Thanks.
  • Vega256Vega256 Posts: 197
    edited 2011-03-19 11:08
    Mike Green wrote: »
    It is not the same SRAM as used in the C3. It's a parallel SRAM and there are no drivers available. It should be easy to make your own, but none exist yet. The C3's SRAM is a serial SPI SRAM, the 23K256 ... very different. When in doubt, read the datasheet. That's what I did to answer the question.
    Would it be as simple as setting the I/O pins to output the address of the data required and then setting eight of the I/O pins as inputs to receive the returned data? (Of course all of this must take place within a certain time specification of the chip)
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