SPD EEPROM Specification
In addition to the description of the transmission interface, I2C information, the PC SDRAM Serial Presence Detect (SPD) Specification specification defines the information recorded in the EEPROM by the manufacturer.…

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SDRAM PC100 Memory Testing Software

You can write your own routine or use ready-made utilities. We recommend using the ctsmb.exe program (System-Management-Bus-Scanner 1.2), which works if there is a South-Bridge PIIX4 on the motherboard (PIIX is the abbreviation PCI-ISA-IDE-Xelerator), i.e. M / V with chipsets TX, LX, BX, ZX, EX in DOS modes or DOS emulation.

The program implements 3 main operating modes:

Generation of a full test report of DIMM-modules in accordance with the specification of Intel.
Generating a printout of the contents of the EEPROM in a table containing hexadecimal codes.
If there is a chip on the board, the LM75 analyzes the temperature conditions of the board.
In the second mode of operation, a byte-by-word or word-by-word (2 bytes) reading from the EEPROM to the specified hexadecimal address is possible.

The disadvantages of the program include the inability to print the test results on-screen, so the data obtained should be printed on a printer (running under DOS) or written to a report file, which can then be viewed in Windows using Office or NC programs.

The minimum configuration of the test bench for testing DIMM modules is shown in Figure 1 – a motherboard (M / V) with a processor and a studied DIMM module, made on the chipsets TX, LX, BX, ZX, EX; 2 – VGA video card; 3 – power supply unit; 4 – FDD; 5 – printer; 6 – keyboard; 7 – monitor.

Such a test bench can serve as the simplest device that allows you to obtain information about the characteristics of the SDRAM module.

We give an example of outputting to the printer information stored in the SPD EEPROM of the Major / Major Hyundai memory module, made in accordance with the PC66 specification, but sold to the consumer as a PC100 memory module. In fairness, it should be noted that at a frequency of 100 MHz, this memory module worked stably.

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