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Altera_Forum's avatar
Altera_Forum
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8 years ago

Signal Tap II reading a "1" from SO of FLASH CHIP always, without changes. why?

I'm creating a very simple Flash controller as a school project. The flash chip is MX25L3206E and the FPGA is 5CEFA4F23C8. I created the code attached and routed the proper pins from the chip. After ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

I have been able to communicate with the CHIP, through 9Fh command.

https://www.alteraforum.com/forum/attachment.php?attachmentid=14813

https://www.alteraforum.com/forum/attachment.php?attachmentid=14814

The problem was because my SI was slightly too forward (half period) to the SCLK. So, the chip actually listen each rise of SCLK, if I don't feed it timely, it does not work. And the "1" is indeed an stand by signal, once SO is actually sending something, it change to 0 or 1.

I still keep having the problem that even tho 9Fh (chip identification) and 05h (read status of "still writting" and "write enable active") seems to be working, and using the 02h (write data), only zero comes out from the chip after using 03h (read data) command.

I ran out of ideas.