DDR stands for DDR memory, DDR SDRAM (Double Date Rate SDRAM, double data rate SDRAM). DDR SDRAM by Samsung was first proposed in 1996 by Nippon Electric, Mitsubishi, Fujitsu, Toshiba, Hitachi, Texas Instruments, Samsung and Hyundai, eight venture agreement entered into memory specifications, and has been AMD, VIA and SiS and other major chipset vendors. It is an upgraded version of SDRAM, it is also known as The most important change is in the interface data transfer, and in his rising and falling edges of the clock signal can be data processing, the data transfer rate of SDR (Single Data Rate) SDRAM 2 times. As for the addressing and control signals are the same with the SDRAM, only to send the clock rising edge.
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DDR About DDR works is important to note optional parameters in the DDR About DDR memory specification is now the mainstream, the major mainstream chipset manufacturers to support it all. DDR stands for DDR SDRAM (Double Date Rate SDRAM, double data rate SDRAM). DDR and SDRAM will use the same nominal frequency. There are now operating frequency of DDR 100MHz, 133MHz, 166MHz three, due to a double data rate DDR memory,
nike air force 1, the characteristics of data transmission, so the identity of the DDR memory working frequency × 2 using the method, which is DDR200, DDR266, DDR333 and DDR400, some memory manufacturers in order to meet the needs of enthusiasts, but also introduced a higher frequency of DDR memory. DDR DDR SDRAM module works with SDRAM modules part, compared to using 184-pin (pin), 4 ~ 6-layer printed circuit boards,
air force one low, electrical interface from In other components or the package is the same with the SDRAM module. DDR SDRAM modules for a total of 184 pins, and only a short slot, the module is not compatible with SDRAM. Principle in the name DDR SDRAM and SDRAM are also different. SDRAM naming names according to clock frequency, such as PC100 and PC133. The DDR SDRAM is based on the principle of data traffic as the name, such as PC1600 and PC2100, units of MB / s. Therefore, in the DDR SDRAM PC1600 DDR200 is actually the same size, data transmission capacity of 1600MB / s (64bit × 100MHz × 2 ÷ 8 = 1600MBytes / s), and PC2100 DDR266 is the same with the case (64bit × 133MHz × 2 ÷ 8 = 2128MBytes / s). DDR SDRAM in the specification by the signal delay time (CL; CAS Latency, CL refers to the memory after receiving the signal, to wait until the number of system clock cycles to read the action. Generally is as short as possible, but This depends on the original settings of memory particles, which will cause system instability) is also somewhat different. In accordance with the Joint Electronic Device Engineering Council (JEDEC) of the definition (specification number JESD79): DDR SDRAM,
nike air force one high, a total of two CAS latency, is divided into 2ns and 2.5ns (ns for the billionth of a second.) CL = 2 with a faster PC 2100 DDR SDRAM specifications called DDR 266A, while the slower CL = 2.5 with PC 2100 DDR SDRAM specification is called DDR 266B. In addition, the slower PC1600 DDR SDRAM in this regard is no particular number. Important to note that purchase of parameters 1, clock frequency: it represents the stable operation of the memory can the maximum frequency. Now we see the DDR memory market is mainly DDR533, DDR667 and DDR800. 2, the access time: Read data access time represents the delay time. Before people have a misunderstanding that it has a link system clock frequency,
air force one high, in fact, is essentially the two have significant differences,
air force 1 shoes, we can say completely different things. The same access time and clock frequency, the smaller the more excellent. 3, CAS delay time: This refers to the vertical address of the pulse response time is measured in a certain frequency to support different specification an important indicator of memory. We use CAS Latency (CL) to measure this indicator. Need friendship here, would like to remind readers of the recent purchase of computers,
nike air force 1 high, Intel's processors are relative to the delay time is not sensitive to the performance of Intel processor, the memory clock frequency is mainly; while AMD processors, the impact It is mainly the CAS latency, AMD platform, the reader should be a lot of attention on this parameter. Atlas Atlas entries open more Category: Computer
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