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314 Discussions

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

SLoi0
Beginner
642 Views

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"

0 Kudos
4 Replies
ShafiqY_Intel
Employee
227 Views

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
Beginner
227 Views

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
Employee
227 Views

Hi,

 

Have you tried to fully erase your Flash device?

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

 

Thanks

SLoi0
Beginner
227 Views
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
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