Macronix 1.8V serial flash memory

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  • blazzelia
    Member
    • Nov 2019
    • 40
    • Romania
    #1

    Macronix 1.8V serial flash memory

    Hi,

    Having an Asus FX505DT with a broken BIOS, I pulled the BIOS chip - a Macronix MX25U12873F - to read what's left in it. I noticed the chip is a 1.8V chip while my RaspberryPi provides 3.3V on GPIO lines.
    I also have an USBASP programmer but it supports 5V and 3.3V voltages.

    Any idea on how to safely interface the little guy to one of the readers?

    Thanks,

    B
    Tags: None
    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30952
      • Albion
      #2
      Re: Macronix 1.8V serial flash memory

      buy a 1.8v adapter on ebay for a few €

        Comment

        • blazzelia
          Member
          • Nov 2019
          • 40
          • Romania
          #3
          Re: Macronix 1.8V serial flash memory

          Originally posted by stj
          buy a 1.8v adapter on ebay for a few €
          Yes, I just did that. I was hoping for a quicker trick... thanks

            Comment

            • blazzelia
              Member
              • Nov 2019
              • 40
              • Romania
              #4
              Re: Macronix 1.8V serial flash memory

              I bought a Pololu level shifter adapter but each time when I read the chip I get a slightly different content (I'm checking using MD5SUM). After 2-3 read operations flashbios no longer see the chip. After a few minutes I can read it again.

              I checked the voltage - 1.85 to 1.9V. Any idea what I am missing?

              Thanks,

              B

                Comment

                • Duranitron
                  Badcaps Veteran
                  • Jul 2014
                  • 544
                  • Philippines
                  #5
                  Re: Macronix 1.8V serial flash memory

                  Originally posted by blazzelia
                  Hi,

                  Having an Asus FX505DT with a broken BIOS, I pulled the BIOS chip - a Macronix MX25U12873F - to read what's left in it. I noticed the chip is a 1.8V chip while my RaspberryPi provides 3.3V on GPIO lines.
                  I also have an USBASP programmer but it supports 5V and 3.3V voltages.

                  Any idea on how to safely interface the little guy to one of the readers?

                  Thanks,

                  B
                  you said its broken bios.. just reflash it with a new bios dump.. for the issue about the 1.8v just buy the 1.8v adapter that will not cost you time, effort and problem because it is proven working for a fraction of $.
                  Never stop LEARNING because life never stops TEACHING!

                    Comment

                    • Duranitron
                      Badcaps Veteran
                      • Jul 2014
                      • 544
                      • Philippines
                      #6
                      Re: Macronix 1.8V serial flash memory

                      that 1.8v adapter card will convert your existing 3.3v to 1.8v. that will safely reflash your bios.. i use ezp2010 that has no issue with 1.8v eeprom.. i have never destroy a 1.8v eeprom with this programmer and a little experiment.. i read both the dump with 1.8v adapter attached and without it read and program it , the same dump checked both and verify its identical maybe its how it powers the eeprom.. anyways. thats my opinion..
                      Never stop LEARNING because life never stops TEACHING!

                        Comment

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