Application Notes for DDR3, DDR4

Efficient eye diagram testing in DDR3/DDR4 system designs

Compliance testing is essential to ensuring that dynamic random access memory (DRAM) signals meet the JEDEC specifications for parameters such as timing, slew rates and voltage levels. For system verification and debugging, eye diagram measurements are the most important tools for efficiently analyzing the signal integrity in any digital design. The specific nature of DDR requires a dedicated solution with a powerful read/write separation to get meaningful eye diagrams on the DDR data bus.

Triggering read and write cycles of DDR3 memories

When analyzing the signal integrity performance of DDR interfaces, separating read and write cycles has been a challenging task. Comprehensive trigger capabilities are required – especially when attempting to recreate the eye diagram in realtime.