EPCQL512 Status Register Bits 7 is on. What is bit 7 and how to turn it off ?

[SLoi0]

Can't make change to the protect bits 2-6 (BP0, BP1, BP2, BP3 and TB) anymore. There is no information on the Status Register Bits 7 in "EPCQ-L Serial Configuration Devices Datasheet"

[ShafiqY_Intel]

Hi SLoi0,

Basically, Status Register Bits 7 is doing nothing. Thus, it is does not matter either 0 or 1.

Do you able to change the Status Register bits 2-6 before?

Do you make any changes before the protect bits 2-6 can't make change?

Thanks😉

[SLoi0]

Yes, I did changed the protect bit register to 0x48 and some how it read back 0xC8 from the status register. When I try to write to the status register again, the status register read back 0xCA and Flag Status Register read back 0x83 (Failure or protection error).

Thanks,

[ShafiqY_Intel]

Hi,

Have you tried to fully erase your Flash device?

Following PDF is the step how to fully erase the flash device.

Thanks

[SLoi0]

Hi MShafiq, I tried to erase with a JIC file which include both the “Used Bitstream’ and “Non-Used Bitstream”, but it failed due to protected sectors. [cid:image006.png@01D5179C.DF734C30] [cid:image001.png@01D5179B.6D329960] Status Register bit 7 got stucked and I can’t change it protect bit anymore. Thanks, Steven