pixelmischief Posted June 25, 2018 Share Posted June 25, 2018 Electrons are trapped in the bit cells to set the data (well, to make a '0' cell)... Why are "written" cells zero instead of one? Quote Link to comment Share on other sites More sharing options...
Bryan Posted July 3, 2018 Share Posted July 3, 2018 Why are "written" cells zero instead of one? I believe it saved an extra transistor per bit cell. With EPROMs, you're basically charging a small floating capacitor acting as the gate of a FET. With no charge present (erased cell), the FET conducts and this is represented by a 1. Once the gate is charged, the FET no longer conducts. UV light can excite the electrons enough that they tunnel through the barrier and discharge the gate (and, they'll discharge themselves naturally over the next 20-50 years). 2 Quote Link to comment Share on other sites More sharing options...
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