Lord Loh.
Full Member level 4
eprsr992
from here...
I have decided to build my own. I plan to give pulses of the duration using 555 timer ICs.
Now the datasheet of my ROM says that I can give a 1ms pulse and see if the data is burnt in. if yes, a 3ms pulse to over programme it.
If the data is not burnt in, I redo the 1 ms programme (repeat till programmed max 25 times). Then give n*3ms pulse of Vpp. Where n is the number of 1ms pulses applied.
If 25 1ms pulses are applied and the data does not burn in, the flowchart says failed.
What does this mean ? I throw the device, or UVErase it and reprogramme ?
from here...
I have decided to build my own. I plan to give pulses of the duration using 555 timer ICs.
Now the datasheet of my ROM says that I can give a 1ms pulse and see if the data is burnt in. if yes, a 3ms pulse to over programme it.
If the data is not burnt in, I redo the 1 ms programme (repeat till programmed max 25 times). Then give n*3ms pulse of Vpp. Where n is the number of 1ms pulses applied.
If 25 1ms pulses are applied and the data does not burn in, the flowchart says failed.
What does this mean ? I throw the device, or UVErase it and reprogramme ?
