Explanation of the terms SPD information of memory

SPD is a set of configuration information about the memory module, such as the number of p-banks, voltage, row address, number of column addresses, bit width, various major operation sequences (such as CL, TRCD, TRP, TRAS, etc.) ......They are stored in a 256-byte EEPROM (ElectricallyErasableProgrammableReadOnly Memory).

In fact, in the SPD, the standard information specified by JEDEC uses only 128 bytes (and 128 bytes, which belong to the manufacturer's own private area). In general, one byte corresponds to at least one parameter, and some parameters require multiple bytes to represent (e.g. product serial number, manufacturer's ** in the Jedec organization).

Each bit in a byte may be used to represent a specific value for this parameter. Since there is a lot of information about SPD, I will not list them all here, and interested readers can refer to the relevant documentation.

The timing information in the SPD is written by the module manufacturer according to the characteristics of the memory chip used and written to EEPROM, and the main purpose is to assist the Northbridge chip to accurately adjust the physical timing parameters of the memory to achieve the best use effect. If the memory setting option is set to "by SPD" in the BIOS.

Then, when the computer is turned on, Northbridge will automatically configure the corresponding memory timing and control registers according to the parameter information in the SPD to avoid faults caused by human adjustment errors. Of course, in the case of DIYER, the timing and control parameters can also be adjusted freely (the physical parameters are still determined by SPD or Northbridge's own testing).

This seems impossible. 。

Memory is a memory device in a computer system.

Memory is used to store programs and data; All information in the computer, including the input raw data, computer programs, intermediate and final running results, is stored in memory, which stores and retrieves information according to the location specified by the controller.

Currently, semiconductor devices and magnetic materials are the storage media that make up the memory. The smallest unit of memory is a bistable semiconductor circuit or a CMOS transistor or a memory element of a magnetic material that can store a binary**. A memory cell is made up of several storage elements, and then a memory is formed by many memory cells.

A memory contains many memory cells, each of which can hold one byte. The location of each storage unit has a number, the address, which is generally expressed in hexadecimal. The sum of all the storage cells in a memory that can hold data is called its storage capacity.

Classification of memory

1. Classified by storage medium.

Semiconductor memory: A memory composed of semiconductor devices.

Magnetic surface memory: A memory made of magnetic materials.

2. Classification according to storage mode.

Random Memory: The contents of any trapped oak storage unit can be accessed randomly, regardless of the physical location of the storage unit.

Sequential memory: It can only be accessed in a certain order, and the access time is related to the physical location of the storage cell.

3. Classified according to the read and write function of the memory.

Read-only memory: A semiconductor memory that has a fixed content and can only be read out but not written.

Random read/write memory: Semiconductor memory that can be read and written at the same time.

To enter the memory card Encyclopedia - Memory.

A device used to store information in an electronic computer. There are internal memory and external memory. According to the different properties of memory, it can be divided into semiconductor memory, magnetic memory and optical memory.

A memory is a collection of many storage cells, arranged in order of unit number. Each cell is made up of a number of ternary bits to represent the values stored in the memory cell, which is very similar to the structure of an array, so in the VHDL language, the memory is usually described by an array.

Storage is a broad economic phenomenon that includes stocks and reserves, and is an economic phenomenon that exists in all social forms.

In any social form, no matter what the reason for the stagnation of materials, no matter what kind of materials, before they enter the production, processing, consumption, transportation and other activities, or after the end of these activities, they always have to be stored, this is storage.

This kind of storage is not necessarily in the warehouse, nor is it necessarily a reserve element, but in any location, and it may never enter the field of reproduction and consumption. However, in general, there is no distinction between the two concepts of storage and reserve.

Storing: that is, protecting, managing, and storing items.

存 [ chǔ cún ].

Basic Definition of New Words Detailed Definition.

chǔ cún ]

1.Store [money or things] and don't use them for the time being.

2.Massive accumulation.

3.Supplies accumulated for future needs.

Internal memory, also commonly referred to as main memory, is the main component in a computer, and it is relative to external memory. Internal memory includes registers, caches, and main memory. The registers are inside the CPU chip, the cache memory is also made inside the CPU chip, and the main memory consists of several memory sticks inserted into the motherboard's memory slots.

The size of the memory and capacity will affect the running speed of the computer.

Memory [ cún chǔ qì ].

Basic definition of new words.

cún chǔ qì ]

A part of a computer that stores information such as programs and data.

SPD is a rewritable ROM on the knowledge surface of the memory module, which records many important information of the memory, such as the chip and module manufacturer of the memory, the working frequency, the working voltage, the speed balance, the capacity, the voltage and the row, the column address bandwidth and other parameters. SPD information is generally written into the ROM chip by the memory module manufacturer according to the actual performance of the memory chip before leaving the factory.

Currently, tape drives (libraries) support backup technologies such as DAT, 8mm, DLT, LTO, AIT, and VXA. Storage capacity is the maximum amount of data that a tape drive can store before the data is compressed. This number depends on two factors, the storage capacity of a single cartridge, and the number of tapes that the drive can hold.

Because tape drives use many different backup technologies, storage capacity is also inconsistent.