QPHY-DDR3

• DDR3 test coverage as described by JESD79-3F
• DDR3L test coverage as described by JESD79-3-1A
• LPDDR3 test coverage as described by JESD209-3B
• Support for:
  • 800 MT/s
  • 1066 MT/s
  • 1333 MT/s
  • 1600 MT/s
  • 1866 MT/s
  • 2133 MT/s
  • Custom speeds
• Fastest way to gain confidence in your DDR3 interface by measuring a large number of cycles and reporting statistically relevant results
• Fully annotated worst case measurement screenshot captured and displayed in report including trace labels and pertinent voltage levels
• Stop on test/failure capability allows the user to pause at a particular test and review the measurement on the oscilloscope display

Due to the high level of variability in DDR3 measurements, it is important to measure a large number of cycles. By measuring a large number of cycles in a very short period of time, the user can be more confident that they are catching the true maximum and minimum points for their measurement. In many cases, QPHY-DDR3 will perform several thousand measurements in the same time competitive equipment will perform less than 100. This allows you to achieve statistical relevance in a single run of QPHY-DDR3 without requiring multiple acquisitions over a long period of time.

Using the “Stop on Test” capability built in to QPHY-DDR3, the user can pause the testing at the completion of each individual test. QPHY-DDR3 will prompt the oscilloscope to save the panel file to preserve the current state of the oscilloscope. The user is then free to perform additional debugging of any particular test to aid root cause analysis. Root causes of failure can be quickly and easily found using all of the advanced serial data tools within the oscilloscope. These include: SDA III, Eye Doctor™ II, WaveScan™, Histograms, Tracks, and many more—making it easy to correlate anomalies with other observed behaviors. Once the user has completed debugging that particular test, they simply click on the “Ok” button in QPHY-DDR3 to resume running the remainder of the selected tests.

These tests perform all of the clock tests as described by the appropriate JEDEC specification. These include average clock period, absolute clock period, average high/low pulse width, absolute high/low pulse width, half period jitter, clock period jitter, cycle-to-cycle period jitter and cumulative error over n period tests.

Shown above, the SlewR test measures the slew rates of the data, strobe, and clock signals. A 2 Mpt acquisition was taken and all of the write bursts were identified. Then every rising edge slew rate was measured. In this case over 1,400 slew rate measurements were performed. As shown above, the worst instance of this measurement will be displayed on the screen. Additionally, the “Stop on Test” ability can be used to perform further analysis on this test to determine the root cause of a failure.

Shown above, the tDQSCK test verifies the strobe output access time from the clock signal. Similar to the electrical tests, a 2 Mpt acquisition was taken and all of the read bursts were identified. Then the time between every strobe edge and its associated clock were measured. In this case over 10,000 tDQSCK measurements were performed. Shown above, the worst instance of this measurement is displayed on the screen. An additional probe can be utilized to capture a separate signal on the board to aid in failure analysis.

Eye Diagrams are a powerful tool for debugging serial data signals. QPHY-DDR3 enables the user to create eye diagrams of both the Read and the Write data bursts to ensure that the signal integrity is sufficient such that the data will be sampled properly by the receiver. Additionally, the Eye Diagram for the Data Signal and the Strobe signal are shown at the same time to ensure proper strobe timing.

• Guides the user through each test setup
• Performs each measurement in accordance with the relevant test procedure
• Compares each measured value with the applicable specification limits
• Fully documents all results
• QualiPHY helps the user perform testing the right way—every time!