Hello everyone, I know there is the BIOS Mods forum and such, but I was wondering if there was a circuit thread. I have some questions about some Flash devices I was wondering if someone could help me with.
Hello! It's a Serial Flash Memory I have the data sheet. I can't post links yet. But the IC is a 25D40/20. Should be the first thing that populates on a search engine. It's made by Zetta Semiconductors I'd like to pull the firmware off of it. I know that's not an easy task. It's not in the Flash ROM supported list or any of the ICS for like the TL866PLus programmer. I'd like to learn how I can build a custom circuit/ use like an STM32 to interface with it and analyze the logic. The end goal would be to write a program that I can interface with the device. Thanks!
Take a look here: https://www.elnec.com/en/device/Zetta/ZD25D40 [TSSOP8]/ Maybe you can search ebay for a "knockoff" programmer that supports it. Worse case, you can use an Arduino with a serial port and send the data to a terminal program on Windows. The interface is SPI, and the device is 3.3V
@Michaela Joy Thanks for the resources, has a lot of interesting stuff on there. I can't find any clones though :/ I didn't think it would work with an arduino as the chip runs at 80-85Mhz and the Arduino only runs at 16Mhz
@value_f0rge: That speed is the maximum speed. You can run it slower than that. Take a look at the spec sheet. http://zettadevice.com/upload/file/20150821/DS_Zetta_25D40_20_RevA.pdf You'll need the data sheet to understand how to make it work using SPI.