Questions about memory DDR

The above is so detailed!!

DDR stands for Double-Rate Synchronous Dynamic Random Access Memory (DRM) and is one type of memory.

DDR memory transmits data twice in a clock cycle, and can transmit data once during the rising and falling phases of the clock, so it is called double-rate synchronous dynamic random access memory. DDR memory can achieve higher data transfer rates at the same bus frequency as SDRAM.

The frequency of DDR memory can be expressed in terms of operating frequency, which is the actual operating frequency of the memory particles, but since DDR memory can transmit data on both the rising and falling edges of pulses, the equivalent frequency of transmitted data is twice the operating frequency.

DDR=Double Data Rate. DDR SDRAM = Double Rate Synchronous Dynamic Random Access Memory, which is commonly referred to as DDR.

Among them, SDRAM is the abbreviation of Synchronous Dynamic Random Access Memory, that is, Synchronous Dynamic Random Access Memory. DDR SDRAM is the abbreviation of Double Data Rate SDRAM, which means Double Rate Synchronous Dynamic Random Access Memory.

DDR memory is developed on the basis of SDRAM memory, and the SDRAM production system is still used, so for memory manufacturers, only a little improvement of the equipment used to manufacture ordinary SDRAM can realize the production of DDR memory, which can effectively reduce costs.

Almost every electronic device, from smartphones to servers, uses some form of RAM memory. Despite the continued popularity of flash NAND, SDRAM is still the dominant memory technology for most computers, as well as computer-based products, due to the good combination of speed and storage offered by SDRAM at a relatively low cost per bit.

DDR, which is SDRAM memory with dual data rates, has become the memory technology of choice today. DDR technology continues to evolve to continuously increase speed and capacity while reducing costs, power, and the physical size of storage devices.

DDR=Double Data Rate. The old storage technology DDR is sometimes referred to as DDR1 to distinguish it from DDR2. Usually people refer to the DDR 1 generation.

It mainly includes DDR333 and DDR400 frequency memory modules.

DDR stands for the memory frequency of the first generation, and the higher the number after the DDR, the higher the memory frequency.

ddr：

DDR is the abbreviation of "Double Data Rate", which means "Double Rate Synchronous Dynamic Random Access Memory".

The full name of DDR is DDR SDRAM (SDRAM is the abbreviation of Synchronous Dynamic Random Access Memory, that is, synchronous Dynamic Random Access Memory), DDR SDRAM is the meaning of double-rate synchronous dynamic random access memory.

DDR can be divided into the following according to the memory frequency

1. DDR1, the old storage technology DDR is called DDR1, which has the same meaning as DDR;

2. DDR2, the second generation of DDR SDRAM memory, faster transmission speed, lower power consumption, and better heat dissipation performance;

3. DDR3, the current mainstream product, has better performance;

4. DDR4, single-ended signaling (traditional SE signaling) mode (differential signaling technology) mode coexists;

5. DDR5, lower energy consumption, and data transmission is 6 Gbps per second.

The algebra of the computer DDR is 1 generation, DDR2 is 2 generations, and so on.

DDR, or Double Rate Synchronous Dynamic Random Access Memory, is one type of memory.

Compared with SDRAM, DDR uses more advanced synchronization circuitry, so that the main steps of specifying address, data transmission and output can be performed independently, and the CPU is fully synchronized. DDR uses DLL (Time-Locked Loop Provides a Data Filtered Signal) technology that can be used by the memory controller to pinpoint the data when it is active, output it every 16 times, and resynchronize the data from the different memory modules.