I write DFh to address 0 on "EPM240T100C5N" by the programmer, security is imposed on the CFM area and only 00 can be read. Is it possible to explain why security is applied even though Security bit is not set ?

Hi TTsuj6,

How did you generate the .pof file? Are you using Quartus programmer to program the .pof file into the EPM240T device CFM memory block ? Or are you using your own custom tools/programmer to program the EPM240T device CFM memory block?

Regards,

Nooraini