Electronics > FPGA

Copy of 18CV8 - question

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yabba235:
Hi !
I copy AMI 18CV8P chip with Labtool 48UXP - save jedec file and for verification save to new tree chip AMI. But is not working !
Is posibillity these chips is fake ?
I attach photo:
first original chip:
second new chips:

up8051:
Układ może być zabezpieczony przed odczytem.
Zostanie utworzony plik JEDEC ale nie będzie zawierał rzeczywistej mapy  FuseBits.

The chip can be read-protected.
A JEDEC file will be created but will not contain the actual FuseBits map.

yabba235:
Well, I don't know - after all, if it is secured, it either shows only zeros or something different every time, and I had the same fusebits every time. If it is secured, it would have to have a "false" read-only map activated when reading is attempted - I didn't read anything about it in the application note, but it says:
"..The PEEL18CV8 provides a special EEPROM security bit that prevents unauthorized reading or copying of designsprogrammed into the device. The security bit is set by the PLD programmer, either at the conclusion of the program-ming cycle or as a separate step, after the device has beenprogrammed. Once the security bit is set it is impossible to verify (read) or program the PEEL until the entire device has first been erased with the bulk-erase function.."
So if I can read it, it is not secured.

up8051:
Układ może być odczytywany zawsze, niezależnie od stanu security bit.
Przy ustawionym Security Bit w odczytanym pliku mapa FuseBit będzie pokazywać same 0 z wyjątkiem
FuseBits odpowiedzialnych za User ID które nie jest protegowane.

Jak podglądniesz zawartość pliku JEDEC to od razu zauważysz czy jest protekcja czy nie.

The chip can always be read, regardless of the security bit status.
With the Security Bit set in the read file, the FuseBit map will show only 0 except
FuseBits responsible for User ID which is not secured.

When you preview the content of the JEDEC file, you will immediately notice whether there is protection or not.

yabba235:
Is this what a map from a secured system looks like?:

 Generated by LabTool-48XP/UXP on Tue May 21 07:24:09 2024
*
QF2696*
L000000 011101111111011111110111111111111111*
L000036 011101111111101110110111111111111111*
L000072 000000000000000000000000000000000000*
L000108 000000000000000000000000000000000000*
L000144 000000000000000000000000000000000000*
L000180 000000000000000000000000000000000000*
L000216 000000000000000000000000000000000000*
L000252 000000000000000000000000000000000000*
L000288 111111111111111111111111110111111111*
L000324 111110111011011101111011111111111111*
L000360 000000000000000000000000000000000000*
L000396 000000000000000000000000000000000000*
L000432 000000000000000000000000000000000000*
L000468 000000000000000000000000000000000000*
L000504 000000000000000000000000000000000000*
L000540 000000000000000000000000000000000000*
L000576 111111111111111111111111111111011111*
L000612 111110111011011110111011111111111111*
L000648 000000000000000000000000000000000000*
L000684 000000000000000000000000000000000000*

Of course, this is only a fragment.

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