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 How to disable SW data protection
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jamesdinsmore

USA
1 Posts

Posted - 12/08/2018 :  14:28:08  Show Profile  Reply with Quote
I have the GQ_4x4 and am working with 28C64 8Kx8 EEPROMS.
I can program a new Altera chip no problem; but I need to sort out a pile of old used XICOR X28C64 chips that I believe have SW data protection.

Image Insert:

96704 bytes

How can I implement this in a script to disable it and to allow me to write to the chip? My attempt at a script is below (did not work):

;/////////////////////////////////////////

; remove 28HC64 data protection

;

;

;

;

;///////////////////////////////////////////

device X28HC64*PLCC32

uncheckbox verify

wait 1

fill AA 1555 1555

write

fill 55 0AAA 0AAA

write

fill 80 1555 1555

write

fill AA 1555 1555

write

fill 55 0AAA 0AAA

write

fill 20 1555 1555

write

message Script End

Sir BlogAlot
Reply #1

anniel

2209 Posts

Posted - 10/11/2019 :  03:55:03  Show Profile  Reply with Quote
quote:
Originally posted by jamesdinsmore

I have the GQ_4x4 and am working with 28C64 8Kx8 EEPROMS.
I can program a new Altera chip no problem; but I need to sort out a pile of old used XICOR X28C64 chips that I believe have SW data protection.

Image Insert:

96704 bytes

How can I implement this in a script to disable it and to allow me to write to the chip? My attempt at a script is below (did not work):

;/////////////////////////////////////////

; remove 28HC64 data protection

;

;

;

;

;///////////////////////////////////////////

device X28HC64*PLCC32

uncheckbox verify

wait 1

fill AA 1555 1555

write

fill 55 0AAA 0AAA

write

fill 80 1555 1555

write

fill AA 1555 1555

write

fill 55 0AAA 0AAA

write

fill 20 1555 1555

write

message Script End


Did you eventually succeed?
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