Questions and Answers
SRAM needs to be refreshed periodically like DRAM.
False
The access time of SRAM is typically 10 nanoseconds.
True
DDR SDRAM stands for Double Data Rate Synchronous Dynamic Random-Access Memory.
True
RDRAM is slower than traditional SDRAM.
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SRAM is more affordable than DRAM.
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ROM is a type of memory that can be read and written.
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Main memory is also known as auxiliary memory.
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RAM is volatile, meaning the information is lost if the power is turned off.
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SRAM stands for Static Random Access Memory.
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DRAM needs to be refreshed periodically to maintain its content.
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Bit is the smallest measurement unit of memory, followed by Kilobyte (KB).
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Study Notes
Computer Memory
- Computer memory is a physical device that can store information temporarily or permanently, using integrated circuits and utilized by operating systems, software, and hardware.
- It is a group of addressable cells used to store data, with two main types: main memory (primary memory) and secondary memory (auxiliary memory).
Measurement Units of Memory
- The measurement units of memory are: bit, Byte, kilobyte (KB), megabyte (MB), gigabyte (GB), terabyte (TB), petabyte (PB), Exabyte (EB), zettabyte (ZB), and yottabyte (YB).
Types of Memory
- Main memory has two types: RAM (random access memory) and ROM (read-only memory).
RAM (Random Access Memory)
- RAM is a type of memory that can be read and written.
- It stores instructions and data when executing programs.
- RAM is volatile, meaning its content is lost when the power is turned off.
- RAM is very fast in processing and is called "alive" or "active" memory.
- It is important for the user.
ROM (Read-Only Memory)
- ROM is a type of memory that can only be read.
- It is used to store critical information necessary to operate the system (BIOS, etc.).
- ROM is non-volatile, meaning its content is retained even when the power is turned off.
- ROM is very fast and is called "dead" or "permanent" memory.
- It is important for the computer.
Types of RAM
- There are two types of RAM: DRAM (dynamic random access memory) and SRAM (static random access memory).
DRAM (Dynamic Random Access Memory)
- DRAM is composed of capacitors that must be refreshed periodically to maintain its content.
- DRAM has to be refreshed thousands of times per second.
- It offers a higher information capacity but a slower access time.
- DRAM access time is about 60 nanoseconds (ns).
- It is cheaper and volatile, meaning it loses its content when the power is turned off.
SRAM (Static Random Access Memory)
- SRAM is composed of a set of flip-flop circuits.
- SRAM does not need to be refreshed.
- It is the fastest type of RAM, with a typical access time of 2 ns.
- It is more expensive and non-volatile.
Types of DRAM
- SDRAM (synchronous DRAM) is a single data rate, which is slower than DDR RAM.
- DDR SDRAM (double data rate SDRAM) is a newer form of SDRAM that can improve speed to 200 megahertz (MHz) or more.
- DDR sends and receives data twice as often as common SDRAM.
- RDRAM (Rambus dynamic RAM) is another type of memory that works like DRAM but is a lot faster, with a high-speed data bus.
