Forum Discussion
Occasional ContributorEPM7128LC84-7N CANNOT BE ACCESSED
You first need to be careful with your nomenclature.
EPM7128LC... devices are NOT JTAG programmable devices. They must be programmed on a 3rd party parallel programmer.
EPM7128SLC... (note the 'S') are JTAG programmable devices, but they can be programmed to disable the JTAG pins and use as I/O pins.
I am assuming your use of the non-S part number was just a typo on your part.
But the parts you sourced from eBay who actually knows if they are good, bad, or counterfeit?
Maybe your seller knows, or maybe not.
Almost invariably parts this old are pulls from equipment.They could be good parts but were programmed to disable the JTAG interface in their past application, to mimic non-JTAG parts.
If so, you need a 3rd party programmer to erase the programming and reenable the JTAG interface.And the -N suffix just means it is in a Pb-free package. The internal part is the same, -N or not.
Frequent ContributorYou first need to be careful with your nomenclature.
EPM7128LC... devices are NOT JTAG programmable devices. They must be programmed on a 3rd party parallel programmer.
EPM7128SLC... (note the 'S') are JTAG programmable devices, but they can be programmed to disable the JTAG pins and use as I/O pins.
I am assuming your use of the non-S part number was just a typo on your part.
But the parts you sourced from eBay who actually knows if they are good, bad, or counterfeit?
Maybe your seller knows, or maybe not.
Almost invariably parts this old are pulls from equipment.
They could be good parts but were programmed to disable the JTAG interface in their past application, to mimic non-JTAG parts.
If so, you need a 3rd party programmer to erase the programming and reenable the JTAG interface.
And the -N suffix just means it is in a Pb-free package. The internal part is the same, -N or not.
Armando1989Hi AK6DN! thanks for your answer.
It was just typo, indeed, they all are EPM7128SLC. My best bet is those guys have screwed the jtag programing capability... When i power on those chips some light blink then stops, thus i guess there is already a program inside, maybe protected already from 3 party manufacturer project... Maybe they just have fetch those chips as they were on some board and announce on ebay....
Ill ask for a refund i think...
BR
- Armando1989Hi Farabi
Chips had been returned and ive been refund. My best bet is as _AK6DN_, cplds cannibalized from scrap pcbs that have been previously jtag disabled by developer.
Thanks in advance
