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Microelectronics - Systems and Devices by Owen Bishop

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3

Memory

Summary
The two main types of memory are random access memory (RAM) and read only memory (ROM). Two types of RAM are static RAM (SRAM) and dynamic RAM (DRAM). There are several types of ROM, including mask-programmed ROM, PROM, EPROM and EEROM. Decoders are used to route signals to or from a specified location in memory. A real time clock relieves the CPU of timekeeping duties.

There are two main types of memory:

  • Random access memory – used for temporary storage. Data may be written into it at any time, and later read from it The data is lost when the power supply is switched off. Used for the storage of data and for programs copied from more permanent data stores such as magnetic disks.
  • Read only memory – used for permanent ...

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