discussion about memory

Replies

• 

  [Prototype]

  4GB is 4GB everywhere no matter where it is used. However, when we say memory in PC it implies to the DRAM but when we say memory in mobile, it generally refers to the internal flash storage in mobile.
  
  DRAM and Flash are two different technologies. DRAMs are faster and dense but are volatile. Flash on the other hand is non-volatile hence you can retain the data even without any power. But if we talk about RAM in mobile, it's generally LP-DDRs which is like a little stripped version of actual DDRs to save power and area in mobile devices. If you're interested, you can go to #-Link-Snipped-# . JEDEC owns the DDR standard and the specifications are downloadable for free.
• 

  radha gogia

  [Prototype]

  4GB is 4GB everywhere no matter where it is used. However, when we say memory in PC it implies to the DRAM but when we say memory in mobile, it generally refers to the internal flash storage in mobile.
  
  DRAM and Flash are two different technologies. DRAMs are faster and dense but are volatile. Flash on the other hand is non-volatile hence you can retain the data even without any power. But if we talk about RAM in mobile, it's generally LP-DDRs which is like a little stripped version of actual DDRs to save power and area in mobile devices. If you're interested, you can go to #-Link-Snipped-# . JEDEC owns the DDR standard and the specifications are downloadable for free.

  if 4 GB in ram and in flash memory are same then how come data stored is more in a pc than in a mobile phone,so basically what material is used for the purpose of design of flash memory in mobile phone and what is its comparison with the transistor and semiconductor used to make up a dram
• 

  [Prototype]

  radha gogia

  if 4 GB in ram and in flash memory are same then how come data stored is more in a pc than in a mobile phone,so basically what material is used for the purpose of design of flash memory in mobile phone and what is its comparison with the transistor and semiconductor used to make up a dram

  I do not know how you came to the conclusion that 4 GB of data stored is more in pc than in a mobile phone. Please elaborate?
  
  As I said above, 4GB is 4GB everywhere!
  
  Technically speaking, flash and RAM cannot be compared as flash is a technology/concept to build a memory while RAM is an application. You can very well build a RAM with flash memory but it'll be slower since the process it takes for storing and erasing in flash will be always slower than charging and discharging of capacitor (which is exactly how the memory in DRAM works).
• 

  radha gogia

  [Prototype]

  I do not know how you came to the conclusion that 4 GB of data stored is more in pc than in a mobile phone. Please elaborate?
  
  As I said above, 4GB is 4GB everywhere!
  
  Technically speaking, flash and RAM cannot be compared as flash is a technology/concept to build a memory while RAM is an application. You can very well build a RAM with flash memory but it'll be slower since the process it takes for storing and erasing in flash will be always slower than charging and discharging of capacitor (which is exactly how the memory in DRAM works).

  I am able to get it but i could not understand that RAM is an application becoz it is a memory made up of capacitors, if it is an application then what builds it up more than the memory cells
• 

  Abhishek Rawal

  radha gogia

  I am able to get it but i could not understand that RAM is an application becoz it is a memory made up of capacitors, if it is an application then what builds it up more than the memory cells

  Flash memory can work as RAM and also as ROM. So, technically RAM or ROM is considered as an application depending on how we use the Flash memory.
• 

  radha gogia

  Abhishek Rawal

  Flash memory can work as RAM and also as ROM. So, technically RAM or ROM is considered as an application depending on how we use the Flash memory.

  so it means that dram is not actually ram,its just that we make up a memory of capacitors and that what is a flip-flop and it stores the contents dynamically
• 

  Abhishek Rawal

  radha gogia

  so it means that dram is not actually ram,its just that we make up a memory of capacitors and that what is a flip-flop and it stores the contents dynamically

  No No No! In my previous comment I was talking about Flash memory that can act like ROM as well as RAM.So yeah, if we consider Flash memory, RAM or ROM can be considered as an application, it depends on how we use it. It's an analogy.
  But DRAMs! DRAM is VM where data is lost once power is lost, so it is perfect as a function of RAM.
• 

  radha gogia

  Abhishek Rawal

  No No No! In my previous comment I was talking about Flash memory that can act like ROM as well as RAM.So yeah, if we consider Flash memory, RAM or ROM can be considered as an application, it depends on how we use it. It's an analogy.
  But DRAMs! DRAM is VM where data is lost once power is lost, so it is perfect as a function of RAM.

  i got RAM is just a technology used to indicate the fact of accesing memory locations in a random manner ,and we differentiate it on the basis of components we use it to make it up but the major criteria is to access the locations randomly but still i cant understand why flash is slow in its processing..
• 

  [Prototype]

  radha gogia

  i got RAM is just a technology used to indicate the fact of accesing memory locations in a random manner ,and we differentiate it on the basis of components we use it to make it up but the major criteria is to access the locations randomly but still i cant understand why flash is slow in its processing..

  I roughly mentioned this earlier. Its mainly due to the difference in the way they both store the data. Flash uses hot injection or tunneling while MOS memory (the one use in RAM) is just charging and discharging of capacitor. Without going into the process detail, the process of tunneling takes more time that charging a MOS capacitor hence making it slower.