Replace am29f200ab with 29f400bb

[valenmanza]

Good again, I have a query, I am trying to modify the flash of a motronic m7.2 that mounts a 29f200ab but I have reading problems with willen in fact in each reading it generates a different checksum (I have already cleaned the pads perfectly).
I have a 29f400bb that reads it perfectly, my question is if I can write the 256kb file of the 29f200ab in a 29f400bb and how should I do it.
Thank you !

[kris81orzesze]

Good again, I have a query, I am trying to modify the flash of a motronic m7.2 that mounts a 29f200ab but I have reading problems with willen in fact in each reading it generates a different checksum (I have already cleaned the pads perfectly).
I have a 29f400bb that reads it perfectly, my question is if I can write the 256kb file of the 29f200ab in a 29f400bb and how should I do it.
Thank you !
write twice, mean one for frst 256kb and second ,for second part of memory. you have to make the file 512kb size

[valenmanza]

Can someone join me the two files? I do not know how to do it....

[kris81orzesze]

just write first one by programmer and wrte again with offset for second part

Can someone join me the two files? I do not know how to do it....

[valenmanza]

I do not know how to do....

[a500tut]

You file ready.

[valenmanza]

Thanks a million, I try and tell you the result.

[dabyd64]

As the 29f400bb

As the 29f400 has double memory, its has another address line, A17.
If your design used a 29f200, probably that line is unused and left floating.
Check your board. If it's connected to Gnd it's ok.
But if not, that may cause problems. I would put that line to Gnd , that way it would be 100% the same as the 29f200.
https://www.digital-kaos.co.uk/forums/attachment.php?attachmentid=713379&d=1589186764

[ZiZiTun]

there you have pinout from 29F400 PSOP44 and 29F200 PSOP44