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However, I’m struggling to understand some sentences in the datasheet, if someone please can help me to find out what these phrases mean: First, try the shift registers stuff to get work.

CS to low 3. Thanks for you quick reply, Can you please be more specific about this: The same with write.

AM29F040B Datasheet PDF

Erase function still remain for later when write and read are functionnal: You have to study the writing algorithm, described on pagesor find a ready sw somewhere. What’s the next step now.

I would recommend you a step by step approach. If there is any recommandation or correction please don’t hesistate to do it to help me out: Then, set the other signals and do check you see them all as required.

OE to low 4. Q0 – Q7 are connected to A8 – A Below, Is the circuit: I read some replies from people in some forums, they claimed that arduino UNO which I use, is not fast enough to drive correctly AM29FB because arduino can’t drive 20ns or something like thatin other hand some others confirm that’s possible to do.

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I have used arduino a couple of months, I have made a different projects using it, such as Car robot, little Game Console with LCD Try to create the following functions, ie.: Regarding the read operation, I think it’s very clear but can you be more specific about this: WE to low 4.


Hi Pito, As requested, this is code that I have wrote. Programmers are so expensive. Hi everyone, Regarding the flash memory programming, I can say now that I can read the eeprom. CS high Erasing requires a special sequence too. Erase is a sequence of commands see table 4.

So, I think the shift registers work well and arduino pins too. LOW For the other pins, they are directly connected to the arduino, despite of this I have test them out with Voltmeter too to be sure. I tried several algorithm from the writing timing Diagram without success. Please in the attachement the timing diagram of Write operation, and below the flow of what I have understood from it.

Hi pito and everyone, Sorry for the late response. So, I decided to make a one for me too.

The am29f40b was yes. Usually reading a byte from flash means: I have read the datasheet but my weakness is the Timing Diagram I’m not an electronic engineer I can’t understand it correctly, which means that I can’t write a functionnal code. The detailed timing diagrams are not important for you when working with arduino, except the write process – either you have to wait long enough, or you have to poll certain data bits until the flash is written reading a flash takes ns, writing takes several msecs usually.

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Send out a 16 bit address only and do check you see the address there with a voltmeter for example. Q0 – Q7 are connected to A0 – A7 Second shift register: I also tested my code below but without any result. I made an sst39sf programmer you can base your programmer off my code see This will run on your arduino uno note that I used avr-gcc to compile it instead of the arduino ide https: Any other clue or idea will be appreciated.


Thanks for your reply Pito, Concerning about what you have said, below is the test result that I have made: Hello, This is my first post in arduino forum, and I’m very glad to use this great device.

CS high Writing the flash is more complicated – to write a byte into the flash require ie. I appreciated your help pito, In the attachement is the screenshot from command definition table of this Flash memory. If the flash is programmed you may try to read first 8 addresses for example when the flash is not programmed, erased, you will read FF. When it works then try to read the flash.

To come to this lack of pins, Shift registers should be used, therefore, I bought 2 shift registers 74HC and wire them in cascading which will give us 16 outputs After that, the big problem has appeared: Now, Searching for new project and especially in GameBoy console, I have found that some people have made programmable gameboy cartridge, changing its Rom and replace it with AM29F Flash Memory.