通过外观看内存类型（See through the appearance of memory type）.docVIP

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通过外观看内存类型（See through the appearance of memory type）.doc

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通过外观看内存类型（See through the appearance of memory type）

通过外观看内存类型（See through the appearance of memory type） Memory is usually marked size, if not, it depends on the number of particles, and give you a look: Samsung memory Example: samsungk4h280838b-tcb0 First bit - chip function K, represents the memory chip. Second bit - chip type 4, stands for dram. Third bit - further description of the type of chip, s stands for SDRAM, H stands for DDR, and G stands for sgram. Fourth, fifth bits - capacity and refresh rate, the same memory capacity, different refresh rates, and different numbers. 64 and 62, 63, 65, 66, 67, and 6A represent the capacity of 64Mbit; 28, 27, and 2A represent the capacity of 128Mbit; 56, 55, 57, and 5A represent 256Mbit Capacity; 51 represents the capacity of 512mbit. Sixth, seventh bits - data line pins, 08 represent 8 bits of data; 16 stands for 16 bits of data; 32 stands for 32 bits of data; 64 stands for 64 bits of data. Eleventh - wired -. Fourteenth, fifteenth bit - chip rate, such as 60 for 6ns; 70 for 7ns; 7b for 7.5ns (cl=3); 7C for 7.5ns (cl=2); 80 for 8NS; 10 For 10ns (66MHz). Know that memory particles encode the meaning of the main digits, and get a memory bar, it is very easy to calculate its capacity. For example, a Samsung DDR Memory, using 18 samsungk4h280838b-tcb0 particle packages. The particle number fourth, fifth 28 stands for the particle 128mbits, The sixth, seventh bit 08 represents the particle as a 8 bit data bandwidth, so that we can calculate that the memory capacity is 128mbits (megabytes) X 16 /8bits=256mb (megabytes). Note: bit is digital, B, that is, the byte byte, and a byte of 8 bits, divided by 8 when calculating. Calculation of memory capacity There are two cases in this article: one is non ECC memory, and the other is that each 8 bits of data with 8 bits of width can form a memory An ECC memory that adds 8 bit ECC checksum after every 64 bits of data. By checking the code, you can detect two of the memory data Bit error, correct an error. So, in the actual calculation