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Nonvolatile Memories and Programmable Logic

2. Reminder. No class next week. 3. Topics. Nonvolatile memoryROMReprogrammable ROM (EEPROM, Flash)Programmable Logic Devices (PLDs)PLAPALCPLDs. 4. Non-Volatile Memory Technologies. Mask (old)Fuses (old)Electrically erasable. 5. Mask ROMs. Oldest technologyOriginally

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Nonvolatile Memories and Programmable Logic

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    1. Nonvolatile Memories and Programmable Logic Anselmo Lastra

    2. 2 Reminder No class next week

    3. 3 Topics Nonvolatile memory ROM Reprogrammable ROM (EEPROM, Flash) Programmable Logic Devices (PLDs) PLA PAL CPLDs

    4. 4 Non-Volatile Memory Technologies Mask (old) Fuses (old) Electrically erasable

    5. 5 Mask ROMs Oldest technology Originally “mask” used as last step in manufacturing Specify metal layer (connections) Used for volume applications Long turnaround Used for applications such as embedded systems and boot ROM

    6. 6 Programmable ROM (PROM) First ones had fusible links High voltage would blow out links Fast to program Single use

    7. 7 UV EPROM Erasable PROM Common technologies used UV light to erase complete device Took about 10 minutes Holds state as charge in very well insulated areas of the chip Nonvolatile for several (10?) years

    8. 8 EEPROM Electrically Erasable PROM Similar technology to UV EPROM Erased in blocks by higher voltage Programming slower than reading Some called flash memory Digital cameras, MP3 players, BIOS Limited life Some support individual word write, some block One on Xess board has 5 blocks Has a boot block that is carefully protected

    9. 9 Details of ROM Memory that is permanent k address lines 2k items n bits

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