ROMs are used to store data on a permanent basis.

More Questions from Memory and Storage

• The most widespread application of ROMs is in the storage of data and program codes that must be available on power-down in the microprocessor-based systems. These data and program codes are called firmware because they are firmly stored in hardware.
• The TMS44100 4M × 1 DRAM does not have a chip select (SC) input.
• A CD player is an example of a device that has random access capability.
• A term often used commercially to refer to read/write memory is sequential-access memory.
• If a memory design allows a storage location to be accessed without first sequencing through other locations, it is called Random Access Memory.
• Flash memories are frequently used in place of floppy or small-capacity hard disk drives in portable computers.
• EEPROM and Flash memory are electrically erasable.
• The floating-gate MOSFET is the actual storage element for EEPROMs. An electron charge will remain on the floating gate for more than 10 years unless drained off electrically.
• More than one bit of data can occupy each memory cell.
• PROMs are basically the same as mask ROMs, once they have been programmed.

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