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Oscilloscope-based compliance tester rolls for DDR2

Posted: 18 Dec 2006 ?? ?Print Version ?Bookmark and Share

Keywords:oscilloscope? DDR2? memory? Agilent? test & measurement?

DDR2 compliance tester from Agilent

Test-and-measurement equipment supplier Agilent Technologies Inc. is debuting what it says is the industry's first oscilloscope-based DDR2 compliance test application. DDR2 memory is an evolutionary upgrade to predecessor DDR technology. DDR2 devices feature higher bandwidths and smaller chip footprints, and dissipate less power, generating less heat.

"Adoption of DDR2 among system OEMs and system integrators is increasing, and we expect interest to continue accelerating into 2007," notes Jay Alexander, VP and general manager of Agilent's design validation division. Alexander says Agilent's N5413A DDR2 test application will run on the company's existing Infiniium 54850 and 80000 Series oscilloscopes.

Compliance measurements
The N5413A DDR2 test application provides DDR2 electrical compliance measurements based on the JEDEC JESD79-2C DDR2 SDRAM specifications and the Intel DDR2 667/800 JEDEC Specification Addendum Rev.1.1.

The N5413A test app also features Advanced Debug mode. It provides crucial measurements such as eye-diagrams, mask tests, ringing measurements and other tests not covered in the JEDEC specs. This mode can help the user discover the root causes of problems in designs.

With the N5413A DDR2 compliance test application, the user can use an ordinary oscilloscope to perform automated testing and margin analysis. The application automatically configures scope for each test and provides informative reports. It also includes margin analysis that indicates how closely a device passes or fails each test.

When conducting DDR2 tests, the user may encounter difficulties connecting to the target device, configuring the oscilloscope, performing the tests and analyzing the measured results. The DDR2 compliance test application therefore guides the user through these steps and does most of this work for the user.

Root-cause analysis
If a designer discovers a problem, the Advanced Debug features in the test application and debug tools in the oscilloscope are available to aid in root-cause analysis. The Advanced Debug function also includes a unique technique that separates Read/Write burst signals on the same bus. That gives the user a powerful tool for debugging.

With increasing data rates and decreasing window validity times of DDR2 memories, signal integrity of measurement tools is critical to achieving accurate and repeatable measurements. Using an Agilent Infiniium 80000 Series oscilloscope and InfiniiMax probing ensures low noise-floor, low jitter measurement floor, low trigger jitter and flat frequency response. That can help optimize DDR2 design margins.

The price for the N5413A DDR2 compliance test application is $3,001. Current Agilent N5413A DDR2 clock characterization application owners can upgrade to the DDR2 compliance test application at no cost.

- Alex Mendelsohn

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