Fastest BGA interposer solution for probing DDR4 x16 designs with a logic analyzer

18-02-2015 | Keysight Technologies | Test & Measurement

Keysight Technologies has introduced a new ball grid array (BGA) interposer
solution for testing DDR4 x16 DRAM designs with a logic analyzer. The
interposer solution provides fast, accurate capture of address, command and
data signals for debugging designs and making validation measurements. The
Keysight W4631A BGA interposer, the world’s fastest interposer solution for
use with a logic analyzer, is used with Keysight’s E5849A probes for
high-data-rate DDR4 DRAM designs.

As the industry transitions to DDR4 data rates up to 3.2Gb/s, 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 W4631A interposer solution solves probing connectivity by providing
access to DDR4 x16 DRAM signals critical to debug and validation efforts.
The probe works in many existing designs and eliminates the need for
up-front planning or redesign. The probe connects directly to the balls of
the DRAM with a DDR4 96 ball riser (included) or an optional 3rd party
socket (not provided), enabling operation and acquisition of high-speed DDR4
signals with low loading and minimal impact to signal integrity on embedded
system design. The interposer solution is designed to be used with the
U4154B logic analyzer system.

The Keysight W4631A BGA interposer is designed for data rates up to 3.2
Gb/s. The probes are used with the U4154B logic analyzer to perform
functional tests, says the company.

“Our customers need more accurate tools to achieve 3.2 Gb/s data rates and
implement power-saving functionality,” said David Cipriani, vice president
and general manager of Keysight’s Oscilloscope and Protocol Division. “With
the new interposer, probes and logic analyzer system, engineers are ready to
test DDR4 x16 data rates beyond today’s data rates of 2400 Mb/s.”

The B4622B DDR2/3/4 and LPDDR/2/3 protocol compliance and analysis toolset –
providing four different software tools: two for functional protocol
compliance checks, one automated physical address trigger setup tool, and
one tool that provides an overview of system performance through bus
statistic information and a histogram view of address access. These tools
help reduce memory designers’ troubleshooting time and increase productivity
and efficiency in DDR design validation work.

The B4621B DDR2/3/4 protocol decoder software – for translating acquired
signals into easily-understood bus transactions showing associated data
bursts. Valid read and write commands are decoded to include row and column
addresses and the complete data burst associated with the command. The
B4621B bus decode software anticipates key system attribute inputs from
default DDR2, DDR3 or DDR4 probing configurations or the DDR setup assistant
tool to accelerate decode of DDR2, DDR3 or DDR4 bus signals.

The DDR eye scan/eye finder – providing unique eye-scan capability to
automatically place the sampling point in both time and voltage within the
eye on each individual channel for optimal sampling reliability. The DDR
eye-scan display provides bus-level signal integrity insight for a
qualitative comparison of all signals scanned under the same conditions.

The DDR setup assistant tool – for guiding users through a short series of
questions and pull-down menus to assist in tuning state mode measurements on
DDR2/3/4/ or LPDDR2/3/4 measurements.

The DDR configurator creator tool – a new tool added to the Keysight DDR
setup assistant and eye-finder software package. The tool allows engineers
to define the footprint’s layout according to a custom probing solution used
in the DDR/LPDDR setup and then create an XML configuration file based on
the footprint information.

The U4154B logic analysis module with 4-Gb/s state speed and 2.5GHz trigger
sequence speed enables full capability so engineers can reliably trigger and
capture DDR4 signals at 3.2 Gb/s. When used with the new DDR4 x16 probing
solution, the B4621B decoder and B4622B compliance software toolset, this
module provides full test capability for system integration in the memory

Keysight E5849A high-data-rate ZIF cables are available for use with the
W4631A interposer solution, says the company.

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