DDR Compliance Testing

GRL’s full DDR compliance tests can meet your product development needs from DDR to DDR5 and LPDDR to LPDDR5.  For DIMMs, SODIMMs or Memory Down, we have the expertise to solve your toughest testing needs.

GRL offers deep DDR expertise and addresses probing and test setup challenges. 

Services for DDR to DDR5, LPDDR to LPDDR5, legacy Hosts & DIMMs include:

 

  • JEDEC Signal Quality tests
  • DDR Functional and Custom tests
  • Test Methodology, Setup & Probing Consultation
  • Memory Bus Design Consultation & Validation
Additionally, GRL offers the following DDR validation services in partnership with FuturePlus Systems:
 
  • DDR3 & DDR4 DIMM/ SODIMM Testing 
  • Memory Channel Validation Audit 
  • Embedded Memory Testing ("Memory Down")
  • Memory Analysis for High-Performance Applications including Margin Testing, Power Management Analysis, Data Bus Utilization Analysis, Bank Group Analysis, and Summary Modes indicating performance over time

DDR-MEMORY-TEST-FuturePlus-system

 

DDR Test

 

DDR

Double Data Rate, DDR is the standard for memory transmission. The literal translation of the name can also help understand: each time pulse cycle (clock cycle) has double data transmission. Memory has evolved from the initial DDR, DDR2, DDR3, and DDR4 to DDR5. DDR standards have different pin positions, transmission speeds, and power consumption. 

 

JEDEC  Association

The full name is JEDEC Solid State Technology Association, established in 1958. It is the leading standards organization for the microelectronics industry, and JEDEC is not affiliated with any country or government entity. The main goal of JEDEC is to standardize the production, testing, and function definition of products such as solid-state storage (SSD), DRAM, flash memory cards, and radio frequency identification (RFID). For more information, please refer to https://www.jedec.org

 

The latest version of DDR Specification

The different DDR versions should follow other specifications. Please log in to your JEDEC account and view specifications on this page: https://www.jedec.org/standards-documents

 

Test Area

DDR can be tested by the below product types.

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DDR Test Process

 

DDR Test Process

process

 

(1) Test Sample & Product Information

  • Please provide two sets of test samples.
    DDR needs to be mounted on the interposer for testing. If you do not have the corresponding manufacturer to help with it, we can provide assistance, please get in touch with us.
  • Product Information: Please fill it out and provide it to GRL before starting the test, we will refer to the product information to test and use it on the test report. <Click to Download>
  • Pin Define: Please provide the "Pin Define" on the interposer. This is essential information for testing, the test will be performed according to the Pin Define you provide.

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(2) Test Report

The DDR test report is a Self-test report only.

DDR Test Items & Instruments Used

 

DDR Test Items

DDR/DDR2/DDR3/DDR4 test items are as follows:

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DDR Test Equipment

  • Keysight DSO-X 91604A 16GHz scope

 

DDR FAQ

Before the Test

1. What needs to be provided before the DDR test?

Please refer to the <DDR Test Process> page. 2 sets of the test sample, product information form, and Pin Define are must provide.

2. What is the sample set before the DDR test?

If your product does not reserve test points, the DDR needs to be mounted on the interposer board. If you need GRL to assist in this part, please provide the pin definition and test samples.

During Testing

1. What function does the DUT need to have during testing?

The DUT (Device Under Testing) must be able to keep outputting the continuous transmission signal so that can be tested.

GRL can help check whether the signal of your product is normal.

2. Should all DDR signals be tested? How to do we select which to test?

There are many DDR signals, we usually do not test all the signals. We recommend testing Clock, DQ, DQS, ADD, and COM. Generally, we will select the longest and shortest distances for testing. Or we can have a further discussion before testing that choose a poorer DQ to test.

After the Test

1. Can the samples be returned after the test is completed?

Yes.

If your product is very special, GRL might investigate your consent and keep samples for 2 months.