EPROM: Perbezaan antara semakan

Bagi mencapai data dari EPROM, alamat mewakili nilai pada pin alamat bagi EPROM dinyahkod dan digunakan bagi menyambung satu perkataan (biasanya 8-bit byte) simpanan pada penguat penimbal keluaran. Setiap bit perkataan adalah 1 atau 0, bergantung kepada simpanan transistor dihidupkan atau dimatikan, pengalir atau bukan pengalir.

 

 

 

Unlike [[EEPROM]]s, the programming process is not electrically reversible. To erase the data stored in the array of transistors, ultraviolet light is directed onto the [[Die_(integrated_circuit)|die]]. Photons of the UV light cause ionization within the silicon oxide, which allow the stored charge on the floating gate to dissipate. Since the whole memory array is exposed, all the memory is erased at the same time. The process takes several minutes for UV lamps of convenient sizes; sunlight would erase a chip in weeks, and indoor [[fluorescent lamp|fluorescent lighting]] over several years. <ref> John E. Ayers ,''Digital integrated circuits: analysis and design'', CRC Press, 2004 , ISBN 084931951X, page 591 </ref> Generally the EPROMs must be removed from equipment to be erased, since it's not usually practical to build in a UV lamp to erase parts in-circuit.