--- Quote Start ---
I think that EPCS don't support (except 128) "Read device Identification" and EPCQ doesn't support "Read Silicon ID", am I correct ?
--- Quote End ---
Correct.
--- Quote Start ---
What do they return if "Read silicon ID" is used for EPCQ and "Read device Identification" for EPCS ?
--- Quote End ---
The DATA (EPCS) or DATA1 (EPCQ) signal is high-impedance when it's not driving. This will be the case when you issue an instruction they don't recognise. What you read back will depend on your design.
If you have a convenient pull-up (which is, probably, not likely to be the case) you'd get something predictable - 0xFF. However, even without you're unlikely to read back a valid device or silicone ID from a device that doesn't support the command.
So, you should be able to distinguish these parts using these two commands.
Happy New Year,
Alex
Honored Contributor
