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1 month ago
Is Serial Flash Discovery Parameter command supported in AT25SF041
Posted byotang30 points 2 repliesHi, I would like to get confirmation if AT25SF041 ( EOL version ) support SFDP command ( 5Ah ) ?
According to this ->//www.wsdof.com/sites/default/files/2020-10/an401…
It stated only newer version AT25SF041B support SFDP command. However, I have an AT25SF041 flash with me. And I can actually send 5Ah and it return 0x50, 0x31, 0x48, 0x31 on first 4 byte. I can confirm this is not AT25SF041B version, cause write to status_register_2 (31h) command doesn't work.
Any idea ? Please help. Also I cannot find SFDP table for AT25SF series in the datasheet. Please let me know where I can get it as well.
thanks,
不
1 month ago
Hi Ot,
AT25SF041 does *not* support SFDP. The AN401 app note is correct.
I just checked myself. For me too 5Ah returned some data which is indeed a bit surprising. However the data returned (both in your case and my case) is not the SFDP signature. The signature should be 0x53, 0x46, 0x44, 0x50 = "S" "F" "D" "P" in ASCII.
My guess, since this was done before my time, is that the 5Ah command was implemented for AT25SF041, however SFDP in general was *not* implemented so there is no valid SFDP block in the device. The command was not removed from the chip for some reason but it is not included in the datasheet, since there is no SFDP support. Again this is the explanation that makes most sense to me.
As for your last question, we do not include SFDP tables in datasheets but we do provide them to users on demand.
Regards,
Eyal