Write a short note on RAM
Answers
Explanation:
RAM (random access memory) is a primary memory in a computer where the operating system, application programs, and data currently in use are kept so that they can be quickly accessed by the CPU. RAM is much faster to read from and write to than the other kinds of storage in a computer. It is a volatile memory which that means data can be stored ones as long as the computer is on. There are different types of RAM.
1. Static RAM: SRAM is one type of RAM and it is a volatile memory. In an SRAM, each bit that stores data is made up of four or six transistors that make up a flip-flop. There are additional transistors that are used to control read and write accesses of storage cells. Each SRAM cell can be in three different states called to read, write and standby. A cell is in the reading state when data has been requested and it is in writing state when the data in the cell is modified. The cell is in the standby state when it is idling.
2. Dynamic RAM: DRAM is also a volatile memory that uses separate capacitors to store each bit. Capacitors, when not charged, represent the value 0 of a bit and when charged represent the value 1. Since the capacitors discharge with time, they need to be refreshed periodically to maintain the values stored in them. Each memory cell in a DRAM consists of a capacitor and a transistor and these cells are arranged in a square array.
3. SDRAM Synchronous Dynamic Random Access Memory: SDRAM is a type of main memory that synchronizes itself with the computer’s system clock. This type of memory synchronizes its input and output signals with the incoming clock that is used in the system board. Its speed rating is given in MHz to easily compare it to system board bus speeds. By doing so, data transactions can continually take place with each successive rising edge of the clock. The clock is used as the main determining factor for memory data operation. The memory array is composed of two banks that can be accessed independently.
4. EDO RAM: EDO is short for Extended Data Out-and is a type of memory that was first used with Pentium computers. EDO allows a CPU to access memory 10 to 15 percent faster than the compatible Fast Page memory.
5. DDR RAM: DDR (Double Data Rate DRAM) is similar to SDRAM. The transfer of data for DDR components can be performed at both edges of the clock signal. This allows a double rate of transmission speed enabling the device to operate at speeds twice that of typical SDRAM devices.
6. DDR2 RAM: The main benefit is speed runs its bus at twice the speed of the memory cells it contains. This enables faster bus speeds than older DDR memory. It also consumes less power than DDR.
Answer:
Random access memory (RAM) provides space for computer to read and write data to be accessed by the CPU ( central processing unit ).
when people refers to a computer's memory, they usually means RAM . If you add more RAM to you computer, you reduce the number of times your CPU must read data from your hard disk.