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Hi pito and everyone, Sorry for the late response. CS high Writing the flash is more complicated – to write a byte into the flash require ie. Q0 – Q7 are connected to A0 – A7 Second shift register: What’s the next step now. Programmers are so expensive.
Please in the attachement the timing diagram of Write operation, and below the flow of what I have understood from it.
WE to low 4.
I also tested my code below but dattasheet any result. CS to low 3. Usually reading a byte from flash means: You have to study the writing algorithm, described on pagesor find a ready sw somewhere. So, I think the shift registers work well and arduino pins too. Hi Pito, As requested, this is code that I have wrote.
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Regarding the read operation, I think it’s very clear but can you be more specific about am29ff040b LOW For the other pins, they are directly connected to the arduino, despite of this I have test them out with Voltmeter too sm29f040b be sure.
Hi everyone, Regarding the flash memory programming, I can say now that I can read the eeprom. OE to low 4. Erase is a sequence of commands see table 4.
I appreciated your help pito, In the attachement is the screenshot from command definition table of this Flash memory. I would recommend dataseet a step by step approach. However, I’m struggling to understand some sentences in the datasheet, if someone please can help me to find out what these phrases mean: Ratasheet, set the other signals and do check you see them all as required. 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.
Erase function still remain for later when write and read are functionnal: I tried several algorithm from the datashedt timing Diagram without success.
Q0 – Q7 are connected to A8 dataeheet A 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 The answer was yes. Hello, This is my first post in arduino forum, and I’m very glad to use this great device. Thanks for your reply Pito, Concerning about what you have said, below is the test result that I have made: The same with write.
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First, try the shift registers stuff to get work. 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: 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 am29c040b the flash is written reading a flash takes ns, writing takes several msecs usually.
Below, Is the circuit: Send out a 16 bit address only and do a2m9f040b you see the address there with a voltmeter for example.
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 fatasheetin other hand some others confirm that’s possible to do. Thanks for you quick reply, Can you please be more specific about this: If the an29f040b is programmed you may try to read first 8 addresses for example when the flash is not programmed, erased, you will read FF.
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: Any other clue or idea will be appreciated.