World's smallest BGA interposer solution for probing DDR4 x16 designs

08-07-2015 | Keysight Technologies | Test & Measurement

Keysight Technologies has introduced a ball grid array (BGA) interposer
solution for testing DDR4 x16 DRAM (dynamic random access memory) designs
with a logic analyzer. Using the Keysight W4636A DDR4 x16 BGA interposer
solution, engineers can quickly and accurately capture address and command
signals, and a subset of data signals, for debugging designs and performing
functional validation measurements for data rates up to 2,400Mb/s.

The Keysight W4636A BGA interposer is the world's smallest DDR4 x16 BGA
interposer solution for use with a logic analyzer, making it ideal for
testing designs with tight space restrictions, says the company.

As the memory industry transitions to DDR4 designs, engineers working on
next-generation memory systems - such as those used in servers and embedded
devices - face significant challenges. Probing and accurate signal capture
are becoming increasingly critical for debug and validation of new designs.
The W4636A DDR4 x16 two-wing, small-KOV (keep-out volume), BGA interposer -
the latest addition to the W4630A Series DDR4 BGA interposer family - is for
engineers who need to view DDR4 x16 DRAM traffic and have limited KOV on
their systems under test. It is also for engineers who need to perform
functional compliance tests on DDR4 devices with ADD/CMD signals.

The W4636A interposer solution provides direct access to the balls of
JEDEC-standard DDR4 x16 96-ball DRAM with low loading and minimal impact to
signal integrity on embedded-system designs. The interposer solution is
designed to be used with the Keysight U4154B logic analysis system, E5847A
ZIF (zero insertion force) probes and U4201A cables for functional
compliance and performance validation and analysis on ADD/CMD and a subset
of DQ (data).

"Our customers need a selection of DDR4 BGA interposers to cover a variety
of system designs," said David Cipriani, vice president and general manager
of Keysight's Oscilloscope and Protocol Division. "With the W4636A
interposer and U4154B logic analyzer system, engineers with tight space
restrictions are ready to test DDR4 x16 DRAM in their systems."

For engineers who require access to all ADD/CMD/DQ/DQS at data rates more
than 2,400Mb/s, the W4633A x4/x8 DDR4 BGA interposer and W4631A x16 DDR4 BGA
interposers capture all ADD/CMD/DQ/DQS signals at data rates of at least

The U4154B logic analysis module with 4Gb/s state speed enables engineers to
reliably trigger on specific events and capture DDR4 traffic. When used with
the new DDR4 interposer solutions, B4621B DDR decoder and B4622B compliance
software toolset, this module provides functional test capability for system
integration in the memory industry with visibility of the upper data byte
lane up to 2,400Mb/s, says the company.

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