JEDEC 79 DDR SDRAM Specification

- details of the JEDEC specification or Standard 79 defining details of DDR SDRAM memory integrated circuits.

SDRAM tutorial includes:

    •  SDRAM basics
    •  SDRAM architecture
    •  SDRAM operation & timing
    •  DDR SDRAM
    •  DDR2 SDRAM
    •  DDR3 SDRAM
    •  DDR4 SDRAM
    •  JEDEC 79 DDR standard

In order to enable DDR SDRAMs from a variety of manufacturers to be used in a product, JEDEC, the Solid State Technology Association has developed a standard to ensure compatibility.

Anyone designing a product will want to ensure that wherever possible, chips can be sourced from a second supplier.

This can only be done if they conform to the same standard. Accordingly JEDEC developed their standard 79 to enable manufacturers of DDR SDRAM to produce product that was interchangeable.

JEDEC DDR SDRAM Standard 79 outline

The JEDEC DDR SDRAM specification or standard defines all required aspects of 64Mb through 1Gb DDR SDRAMs with X4/X8/X16 data interfaces. It includes a whole variety of elements including features, functionality, ac and dc parametrics, packages and pin assignments.

The DDR SDRAM specification is expanded will be expanded to formally apply to x32 devices, and higher density devices as well.

The aim of the JEDEC 79 DDR SDRAM Standard is to define the minimum set of requirements for 64Mb through 1Gb, X4/X8/X16 JEDEC compliant DDR SDRAMs.

This enables system designs based on the required aspects of the specification to be supported by all DDR SDRAM vendors providing JEDEC compliant devices.

JEDEC DDR SDRAM Standard 79 revisions

Since the first release of the JEDEC there have been a number of updates:

By Ian Poole

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