What is the difference between Static and Dynamic RAM. A 20address line CPU has
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What is the difference between Static and Dynamic RAM. A 20address line CPU has a memory space that is populated by two 512K ICs. This CPU has a line (M). which indicate when memory is to be accessed. That is, when this line (M)is High, the memory system is accessed and the appropriate memory IC should activated When this line is low, all memory ICs are not active. Assuming that both memory ICs have an active high Chip Unable. Use the address bus and the M line to show how this memory system is controlled. How many address lines are needed to control a 16 Terra Byte memory spaceExplanation / Answer
1)
•Firstly the main difference in the structure varies due to transistor and capacitor number and setting as just three to four transistors are required for a Dynamic RAM, but six to eight MOS transistors are necessary for a Static RAM.
•Secondly Dynamic RAM memory can be deleted and refreshed while running the program, but in case of Static RAM it is not possible to refresh programs.
•Data is stored as a charge in a capacitor in Dynamic RAM, where data is stored in flip flop level in Static RAM.
•For refreshing a data another capacitor is required in case of Dynamic capacitor, but no refreshing option is available in Static RAM.
•A Dynamic RAM possesses less space in the chip than a Static RAM.
•Dynamic RAM is used to create larger RAM space system, where Static RAM create speed- sensitive cache.
•Static ram is 4 times more expensive than Dynamic RAM.
•Dynamic RAM consumes less power than Static RAM.
•For accessing a data or information, Static RAM takes less time than Dynamic RAM.
•Dynamic RAM has higher storage capacity. In fact it can store 4 times than Static RAM.
With all mentioned differences, 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.
3)
RAM is the purest expression of Moore's Law The definition of Moore's Law is "roughly double the number of transistors every 24 months."
My 1st computer: 4k or 16k? My first computer - bought 30 years ago - was the original Apple ][. The big choice was the amount of RAM. As befits a future storage geek, I splurged for 16K of RAM, handy if you wanted to use floating point BASIC.
Fast forward Earlier this week I ordered another 4 GB RAM to bring the quad-core Pro up to 8 GB of RAM, hoping to speed up video compression and transcoding. Not to mention bragging rights.
From 16 KB to 8 GB: that's 5,000x in 30 years. That's somewhere between a 4x and 5x increase every 5 years - roughly in line with Moore's Law. 2x every 2 years is 4x every 4 years.
It is probably on the low side because I spent a lot more for RAM then than I do today.
Address space consumption One of my all-time favorite storage papers, by the late, great Jim Gray and Preshant Shenoy, Rules of Thumb in Data Engineering, observes that we use another bit of address space every 18 months.
Let's apply that empirical rule to my Mac.
2^33 = 8 GB 2^44 = 16 TB
That's 11 bits of address space which should take, roughly, 17 years to "consume." That means that in 2025 I'll be sitting down to a 16 TB Mac - or something better if it comes along - and editing my 3D 8k x 8k virtual world movie. Or something.
But what about you? Let's say you have a notebook with 1 GB RAM and you are happy with it. That's 30 bits of address space. So for you to consume another 14 bits of address space will take 21 years. So you won't need a 16 TB notebook until 2029.
Start saving now.
The Storage Bits take Even the top chip technologists can't see beyond 10 years, so we have no idea if Moore's law will continue to hold until 2025. It may not be physically possible to build 4 TB DIMMs
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