Electronics > Microcontrollers

Read/Write EEPROM Fairchild NM93C46 with Buspirate

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MartinMart:
I know the Buspirate is quite an old tool, but if someone still has experience with it, I would really appreciate your help.

I try to read data from an EEPROM with it (Fairchild NM93C46) Datasheet: https://pdf1.alldatasheet.com/datasheet-pdf/view/54268/FAIRCHILD/NM93C46N.html
I also found this tutorial end set everything up the same way: http://dangerousprototypes.com/forum/index.php?topic=7112.0

VCC -> 5V
GND->GND
CS->CS
SK->CLK
Do->Miso
Di->Mosi
3V -> Pullup-restistors


I then used the 3Wire mode set up as in the tutorial above.

When i try the command  [-^^_^ _^:7 r] or ]-^^_^ _^:6 r:1024[ or anything similar I always get 0xFF.

Really appreciate any help and guidance. :D

mon2:
Swap the DO and DI connections and try again.

MartinMart:
Hi, thanks for your help, then the output switches to 0x00...
Edit: I checked all connections again with a multimeter, and then I suddenly received an output of some HEX values and the rest 0xFF, but re-running the same command [-^^_^ _^:6 r:1024] gave me different values? Shouldn't the read output stay the same all the time?

mon2:
Yes, the results should be consistent.

Go back to your original wiring but try with a slower clock value. The max clock is 400khz but suggest to try with 10khz, etc.

MartinMart:
Also did not change anything, tried all available khz (5, 50, 100), same result only 0xFF (which I also get if I have nothing connected to the buspirate at all)
I redid one solder and then checked all connections again with the multimeter, all looks fine. (used 200 Ohm)
When I swap DI/DO I get random values, so I am pretty sure my standard connections is right.
Already tried to initiate/close the command with ]/[ instead of [/] as well, didn't change anything either.

I also checked if the EEPROM still works in its original use and it does, so I did not kill it yet  8)

Any further things I could try? I am slowly running out of ideas...

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