Different Types of RAM

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RAM types
   Different types of RAM RAM RAM stands for Random Access Memory. It is place where computer stores its Operating System. Application Program and current data. when you refer to computer memory they mostly it mean RAM. The two main forms of modern RAM are Static RAM (SRAM) and Dynamic RAM (DRAM). DRAM memories (Dynamic Random Access Module), which are inexpensive . They are used essentially for the computer's main memory SRAM memories(Static Random Access Module), which are fast and costly. SRAM memories are used in particular for the processer's cache memory. Early memories existed in the form of chips called DIP (Dual Inline Package). Nowaday's memories generally exist in the form of modules, which are cards that can be plugged into connectors for this purpose. They are generally three types of RAM module they are 1. DIP 2. SIMM 3. DIMM 4. SDRAM 1. DIP(Dual In Line Package) Older computer systems used DIP memory directely, either soldering it to the motherboard or placing it in sockets that had been soldered to the motherboard. Most memory chips are packaged into small plastic or ceramic packages called dual inline packages or DIPs . A DIP is a rectangular package with rows of pins running along its two longer edges. These are the small black boxes you see on SIMMs, DIMMs or other larger packaging styles. However , this arrangment caused many problems. Chips inserted into sockets suffered reliability problems as the chips would (over time) tend to work their way out of the sockets.   2. SIMM A SIMM, or single in-line memory module, is a type of memory module containing random access memory used in computers from the early 1980s to the late 1990s . It differs from a dual in-line memory module (DIMM), the most predomiant form of memory module today,in that the contacts on a SIMM are redundant on both sides of the module. Most early PC motherboards (8088-based PCs, XTs, and early ATs) used socket DIP chips. with the introduction of 286-based IBM XT/286, which could use larger amounts of memory , memory modules evolved to save motherboard space and to ease memory expansion. instead of plugging in eight or nine single DIP DRAM chips, only one addtional mmory module was needed to increase he memory of the computer. SIMM modules with 30 connectors (dimensions are 89x13m) are 8-bit memories with which first-generation PCs were equipped (286,386). Single Inline Memory Module (SIMM) SIMM is a memory module with 72 or 30 pins, as shown in Figures and . SIMMs are considered legacy components and can be found in older machines. SIMMs with 72 pins can support 32-bit transfer rates and 32-pin SIMMs can support 16-bit transfer rates.   72 pin Bottom SIMMs   3. DIMM A DIMM or dual in-line memory module, comprises a series of dynamic random access memory integrated circuits. These modules are mounted on a printed circuit board and designed for use in personal computers, workstations and servers. DIMMs began to replace SIMMs (Single in-line memory modules) as the predominant type of memory module as Intel P5-based Pentium processers began to gain market share. The main difference between SIMMS and DIMMs is that DIMs have separate electrical contacts on each side of the module, while the contacts on SIMMs on both sides are redundant. Another difference is that standard SIMMs have a 32-bit data path, while standard DIMMs have a 64-bit data path. Since Intel’s Pentium has a – bit bus width, it requires SIMMs installed in matched pairs in order to complete the data bus. The processer would then access the two SIMMs simultaneously. DIMMs were introduced to eliminate this practice.   4. SDRAM Synchronous dynamic random access memory (SDRAM) is a dynamic random access memory that is synchronized with the system bus. SDRAM has a synchronous interface, meaning that it waits for a clock signal before responding to control inputs and is therefore synchronized with the computer’s system bus.  

PHY 442exp1.docx

Jul 23, 2017


Jul 23, 2017
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