What does the mobile RAM mean?

RAM is the abbreviation of English random-access memory, Chinese translation is random access memory, for mobile phone, mobile phone has two kinds of memory: Running memory is also known as RAM, memory also known as ROM, and the author today to explain the mobile phone ram, Plainly is the mobile phone's running memory, the size of the RAM to a large extent the mobile phone's speed, similar to the computer's memory.

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For now, the biggest RAM on the market today is 4GB, and of course there are 3gb,2gb and 1GB or even 512MB.

Running a memory chip

As far as the iphone is concerned, the current iphone5 and above devices are 1GB RAM (running memory).

What does RAM mean--ram definition:

Memory is a very important part of the computer structure, the computer has the memory function, can guarantee the normal work. There are many kinds of memory, which can be divided into main memory and auxiliary memory (or internal memory and external memory) according to its use, the main memory is referred to as memory. Memory plays an important role in the computer, generally using the semiconductor storage Unit "Random access memory (Random access Memory,ram)", also known as random memory.

Depending on how the storage unit works, RAM can be further divided into two broad categories-static RAM (static RAM,SRAM) and dynamic Ram,dram. SRAM has the advantage of fast access, and DRAM is used as the main memory of the system because of its low unit capacity price. However, when the power is off, RAM cannot retain the data, and if data needs to be saved, it must be written to a long-term storage device (such as a hard disk). Here's how the two kinds of RAM work and what they are used for.

1:sram (static RAM, Stationary random memory):

Diagram: Static RAM structure composition schematic diagram

The static storage unit is formed by attaching the gate control on the basis of the static trigger. As a result, it stores data by the self-preservation function of triggers. Static RAM is running very fast, we often say that the CPU level, level two cache is the use of this SRAM. Intel's Pentium III Coppermine CPU combines 256KB Full speed two cache, which is actually an SRAM. When the system gets a request, it first looks for a cache of the processor, looking for similar information, and the processing speed is almost synchronized with the CPU's clock. If the information is in a first-level cache, the CPU will read this part of the information without going to the level two cache or the main memory unit in order to save processing time. Consolidating the SRAM cache will further improve CPU performance.

2:dram (Dynamic RAM, dynamically random memory):

Diagram: Schematic diagram of a basic unit of DRAM

The storage matrix of dynamic RAM consists of dynamic MOS storage units. The Dynamic MOS storage unit uses the gate capacitance of the MoS tube to store the information, but because the capacity of the gate capacitor is very small, and the leakage current cannot be equal to 0, the time of charge preservation is limited. In order to avoid the loss of storage information, the capacitor must be periodically replenished with the missing charge. This operation is often referred to as "refresh" or "regenerate", so there is a refresh control circuit inside the DRAM, which is also more complex than static RAM. However, because the structure of DRAM storage unit can be done very simple, fewer components, low power consumption, has become a mainstream product of large capacity ram.

Dynamic RAM is one of the most familiar types of RAM we have, and the memory that we often talk about (ie, the main memory of the computer system) uses this kind of dynamic RAM. Data stored in DRAM must be constantly refreshed to keep the data intact, otherwise the data will be lost. Each of the smallest units in a dram is made up of one capacitor, the computer reads the information (1 or 0) to identify whether the data saved in it is changed, and if the capacitance is changed (refreshed), the value read from will be 1, if not changed (refresh), the read out value is 0