Static and dynamic memories
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The document outlines the differences between static RAM (SRAM) and dynamic RAM (DRAM), highlighting their characteristics, operational mechanisms, and comparisons. SRAM is faster but more expensive and space-consuming, while DRAM is slower yet cheaper and offers a data refreshing capability. The conclusion emphasizes that DRAM is viable due to its refreshing ability, despite being slower than SRAM.
Static and dynamic memories
- 1. 1 Data Logic and Design Syed Ammar Ali Aqdas Hassan Static and Dynamic memories
- 2. Random Access Memory (RAM) • Random-access memory (RAM) is a type of computer data storage. A RAM device makes it possible to access data in random order, which makes it very fast to find a specific piece of information. – These are volatile, switch the machine off and the contents in this form of memory are lost • There are two main types of RAM – Dynamic RAM (DRAM) – Static RAM (SRAM) 2
- 3. Random Access Memory (RAM) • Static RAM (SRAM) – Memory behaves like Latches or Flip-Flops – Data remains stored as long as power applied 3
- 4. Random Access Memory (RAM) • Dynamic RAM (DRAM) – Charged or discharged capacitor – Memory lasts only for a few milliseconds – Data must be refreshed periodically by reading and rewriting 4
- 6. Working of DRAM • DRAM store data by using Capacitor. Every capacitor store one bit of data in the form of charge and every one bit section is called cell as shown in the figure. • According to diagram shown below bit line potential is high when the potential of word line becomes high then the transistor behave like a close switch then the capacitor starts charging. 6
- 8. Comparison between Static and Dynamic RAM: 8 Static RAM Dynamic RAM Six to eight MOS transistors are necessary for a Static RAM. Three to four transistors are required for a Dynamic RAM Static RAM it is not possible to refresh programs. Dynamic RAM memory can be deleted and refreshed while running the program Data is stored in flip flop level in Static RAM. Data is stored as a charge in a capacitor in Dynamic RAM Possesses more space in the chip. Possesses less space in the chip. It is used to Create speed- sensitive cache. It is used to create larger RAM space system. It is 4 times more expensive and consumes high power. It is 4 times less expensive and consumes less power than static. It takes less time for accessing data or information than DRAM. It takes More time for accessing data or information than SRAM.
- 9. Conclusion: With all thing mentioned, the discussion can be concluded by saying that Dynamic RAM is slower than Static RAM, but it has a refreshing option which makes it more viable. Static RAM is costly and takes more spaces than Dynamic RAM, but is faster than the other. 9
- 10. Thank You 10