Thank you for you time, my knowledge is limited to what I have read on datasheets, if you drive the IO on 6 or 6.25V you will damage the programmer cause maximum input voltage is 5V. Answering you about CS1, 2 and 3, some memories is divided into banks, this is to select this banks.
Also, I'm here trying to help every electronic enthusiastic to build his own programmer and understand how it works, if you want some simpler just show me your ideas cause this way is leaving nowhere.
I've found a cheap universal programmer (TL866CS) for US $35.50 on Aliexpress without any expansion boards, this project worth more for me.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
That is really not a problem because you can place 1k series resistors to limit the current; it would be the opposite in case of 3.3V memories: the programmer drives at 5V so the voltage has to be clamped at target side.
Input protection diodes are present in every integrated circuit, so that the voltage cannot go more than 0.7V above VCC or below GND; of course this is valid if sources are current-limited as with a series resistor, see above.
I'm sorry I cannot help much with schematic diagrams, I have no time currently to do any serious work.
The project is not easy, that's why I think you should reduce the scope a little bit; instead of a fully universal adapter I would concentrate on the devices you really need.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Thank you for you time, my knowledge is limited to what I have read on datasheets, if you drive the IO on 6 or 6.25V you will damage the programmer cause maximum input voltage is 5V. Answering you about CS1, 2 and 3, some memories is divided into banks, this is to select this banks.
Also, I'm here trying to help every electronic enthusiastic to build his own programmer and understand how it works, if you want some simpler just show me your ideas cause this way is leaving nowhere.
I've found a cheap universal programmer (TL866CS) for US $35.50 on Aliexpress without any expansion boards, this project worth more for me.
That is really not a problem because you can place 1k series resistors to limit the current; it would be the opposite in case of 3.3V memories: the programmer drives at 5V so the voltage has to be clamped at target side.
Input protection diodes are present in every integrated circuit, so that the voltage cannot go more than 0.7V above VCC or below GND; of course this is valid if sources are current-limited as with a series resistor, see above.
I'm sorry I cannot help much with schematic diagrams, I have no time currently to do any serious work.
The project is not easy, that's why I think you should reduce the scope a little bit; instead of a fully universal adapter I would concentrate on the devices you really need.