Memory and Storage Questions

• A ROM that allows the user to program data into the chip by permanently opening fusible links is the EPROM.
• A group of 6 bits is also known as 1 byte.
• RAMs must have a input, in addition to data in.
• RAM stands for Readily Accessible Memory.
• A typical RAM will read (place stored data on its outputs) whenever the Chip Select line is active and the Write Enable line is inactive.
• Address multiplexing is used to reduce the number of address lines.
• ROMs are used to store data that generally cannot be easily changed.
• A write operation may also be referred to as a "fetch" operation.
• ROMs are used to store data on a permanent basis.
• 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.
• Once a PROM is programmed it can be changed by applying a small electrical charge.