3rd place——Further type description of the chip, s represents sdram, h representsddrAnd g represent sgram.
The 4th and 5th digits——Capacity andRefresh rateMemory with the same capacity will use different refresh rates and numbers.64, 62, 63, 65, 66, 67, 6a represent 64mbit capacity;28, 27 and 2a represent 128mbit capacity;56, 55, 57 and 5a represent 256mbit capacity;51 represents 512mbit capacity.
6th and 7th digits——Number of data line pins, 08 represents 8-bit data;16 represents 16 bit data;32 represents 32-bit data;64 represents 64 bit data.
11th——Connect "-".
The 14th and 15th digits——The chip speed, for example, 60 is 6ns;70 is 7ns;7b is 7.5ns (cl=3);7c is 7.5ns (cl=2);80 is 8ns;10 is 10ns (66mhz).
the way to distinguish
Announce
edit
Content capacity calculation
OneMemory moduleThen it is very easy to calculate its capacity.For example, oneSamsungDdr memory, packaged with 16 samsung k4h280838b-tcb0 particles.The fourth and fifth digits "28" of the particle number represent that the particle is 128mbits, and the sixth and seventh digits "08" represent that the particle is an 8-bit data bandwidth. In this way, we can calculate that the capacity of the memory module is 128mbits (megabits) × 16 pieces/8bits=256mb（Megabyte）。
Note: "bit" means "digit", "b" means "byte", onebyteIf it is 8 bits, the calculation is divided by 8.aboutMemory capacityThere are two cases in the example given in this paper: one is right and wrongEcc memoryEvery eight 8-bit data width particles can form a memory;Another kind of ECC memory, after every 64 bits of data, 8 bits of ECC are addedCheck code。Through the check code, two bit errors in the memory data can be detected and one bit error can be corrected.So in practiceCalculated capacityIn the process of, do not calculateCheck bit, 18 pieces of particles with ecc functionMemory moduleActual capacityMultiply by 16.At the time of purchase, it can also be determined that the memory module of 18 or 9 memory granule patches is ECC memory.
Difference between original granules and white tablets
Memory particles are divided into major brand (or major for short)/White tablet/Downgraded.
"White slice" can be subdivided into Ett, utt and other worse grades.Major, ett and utt are generally traded in the formal market.
The name of utt is untested, which means that it is untested, but actually the most basic physical test is still done, while the name of ett is effectively tested, which means that it passesEffectivenessThe test process of particles is much more than that of utt, and the quality is much better.But none of them has passed the rigorous test of the original major particles.In general, the particles of the original factory should be tested through physical conditions to simulate the aging of particles after years of long-term work in harsh environments (but not really aging the particles). The particles that can pass this test can certainly ensure the stability of long-term use.Only such particles are qualified to be marked with the original factory logo.
