Memory chips

A chip that holds programs and data either temporarily (RAM), permanently (ROM, PROM) or permanently until changed (EPROM, EEPROM, flash memory).

Memory types:

The following are the types of memory chips technologies used in electronic devices.

1.Rewritable - Byte Addressable (DRAM and SRAM)Dynamic RAM (DRAM) and static RAM (SRAM) chips are the "working storage" in every computer. DRAM is the main memory in a computer and SRAM is used for high-speed caches and buffers. Both types are "byte addressable," which means that data can be read and written one byte at a time. 2.Rewritable - Byte Addressable - Symmetric.EEPROM chips and F-RAM, are the memory technologies that offer the byte addressability of DRAM and SRAM, but are become the safe when the power is turned off. In addition, read and write speeds are equal or nearly the same.

3.Rewritable Flash - Block Writes - Asymmetric.Flash memory is the most widely used in both computers and consumer electronics (CE) devices. It takes longer to write than to read, and read and write speeds are asymmetric.

4.Rewritable When Removed (EPROM).EPROM chips are an external "programmer" device and must be removed from the circuit board andshould be placed back in the device for reprogramming.

5.Permanent (ROM and PROM).Data and instructions in ROM and PROM chips can never be changed. ROMs are manufactured, while PROMs are programmed in an external device like EPROMs.