EEPROM memory cells are made from floating-gate MOSFETS (known as FGMOS). Typically a PROM will consist of an array of fuse able links some of which are “blown” during the programming process to provide the required data pattern. The PROM stores its data as a charge on a capacitor. The inner memory is supposed to be as fast as possible, because all the information processing is done through the main memory. Also known as integrated-circuit memory; large-scale integrated memory; memory chip; semiconductor storage; transistor memory. DRAM uses a capacitor to store each bit of data, and the level of charge on each capacitor determines whether that bit is a logical 1 or 0. DRAM memory cells are single ended in contrast to SRAM cells. DRAM stands for Dynamic RAM   (Random Access Memory) or Dynamic Random Access Memory. Additionally, we will be discussing the usage of Random Access Memory (RAM). EEPROM: It is an abbreviation used for electrically erasable programmable read-only memory. Flash memory: Flash memory may be considered as a development of EEPROM technology. exhibit two stable states, which can be used to represent binary 1 and 0. Unlike technologies including DRAM, which require a constant flow of electricity to maintain the integrity of the data, MRAM retains data even when the power is removed. But writing data in a memory location where some data is already present will destroy the previously stored data. What is CMOS (Complementary Metal-Oxide Semiconductor)? The memory devices used for primary memory are semiconductor memories: The secondary memory devices are magnetic and optical memories : 6: Primary memory is also known as Main memory or Internal memory: Secondary memory is also known as External memory or Auxiliary memory: 7: Examples: RAM, ROM, Cache memory, PROM, EPROM, Registers etc: Examples: Hard … As a result of this dynamic refreshing it gains its name of being a dynamic RAM. Secondary Memory. These FG MOSFETs (or FGMOS in short) have the ability to store an electrical charge for extended periods of time (2 to 10 years) even without a connecting to a power supply. RAM(Random Access Memory) is a part of computer’s Main Memory which is directly accessible by CPU. RAM (Random Access Memory) is the internal memory of the CPU for storing data, program, and program result. By transferring data alternately from one set of addresses, and then the other, SDRAM cuts down on the delays associated with non-synchronous RAM, which must close one address bank before opening the next. • 1947 Frederick Viehe of Los Angeles, applies for a patent for an invention that uses magnetic core memory. Basic concepts – Semiconductor RAM – ROM – Speed – Size and cost – Cache memories – Improving cache performance – Virtual memory – Memory management requirements – Associative memories – Secondary storage devices. For secondary memory it uses punch cards. Semiconductor memory is a digital electronic semiconductor device used for digital data storage, such as computer memory. Semiconductor memories are available in integrated circuits (IC's). Later in   the same year, Bob Marsh manufacturers the first Processor Technology’s 4 KB memory boards for the Altair. Implementation of ROM (read-only) semiconductor memories. This computer memory is based on sliding metal parts. The semiconductor RAMs are of broadly two types-static RAM and dynamic RAM. Nevertheless, this type of semiconductor memory used to be widely used in applications where a form of ROM was required, but where the data needed to be changed periodically, as in a development environment, or where quantities were low. EEPROM: This is an Electrically Erasable Programmable Read Only Memory. The memory-erasing time lies between 10 to 30 minutes. Or we can say that the newly entered data will replace the previous data. Cache Memory Cache memory is a very high speed semiconductor memory which can speed up the CPU. The two main types of random-access memory (RAM) are static RAM (SRAM), which uses several MOS transistors per memory cell, and This is true whether the memories are static or dynamic memories and are pcb’s in a memory module or a pcb or pcb’s mounted singularly. Read Only Memory (ROM), also known as firmware, is an integrated circuit programmed with specific data when it is manufactured. How To Troubleshoot Memory (Random Access Memory). Advertisements. A memory location is a group of storage devices that will hold one data word. AND matrix is an address decoder. The fabrication of semiconductor memories is done through CMOS technology. Initially, the data in E2PROM is erased by applying external voltage at the erase pin of the chip. The fast and integrated memory of less capacity is termed as primary memory or main memory. Normally based around semiconductor technology, memory is used in any equipment that uses a processor of one form or another. It is a volatile memory that means the data is stored temporarily until the power supply is ON. With the rapid growth in the requirement for semiconductor memories there have been a number of technologies and types of memory that have emerged. Semiconductor memories (MSI and LSI) are now being used as inner memories.