W4640A and W4630A Series DDR4 BGA Interposers for Logic Analyzers

Keysight W4640A and W4630A Series

DDR4 BGA Interposers for Logic Analyzers

Overview

The W4640A and The W4630A series DDR4 BGA interposers enable probing of embedded memory DRAM from the ball grid array with Keysight Technologies, Inc. logic analyzers.

The Keysight W4630A series DDR4 BGA interposers for logic analyzers enable viewing of data traffic on industry standard DDR4 DRAMs with the Keysight U4164A and U4154A/B logic analysis systems.

The W4640A Series DDR4 BGA interposers are designed to take full advantage of quad sample state mode on U4164A modules with Option 02G, requiring only a single probe point for up to four samples at two different thresholds. The W4640A Series DDR4 BGA interposers have the industry’s smallest KOV (keep out volume) for interposers capable of capturing over 2400 Mb/s data rate DDR4 traffic. W4640A Series BGA interposers are designed to capture data rates in excess of 3.2 Gb/s.

The DDR4 BGA Interposer Advantage

W4640A Series DDR4 BGA Interposer Selection Guide

W4630A Series DDR4 BGA Interposer Selection Guide

W4640 Series DDR4 BGA Interposers and 61-pin ZIF Probe/Cables W4643A: DDR4 x4/x8 BGA Interposer 2-wing, 3.2 Gb/s

Technical Characteristics

Description

Keysight Technologies W4643A DDR4, x4/x8, 2-wing BGA interposers are proven to capture DDR4 ADD/CMD/DQ/DQS at data rates in excess of 3.2 Gb/s. The W4643A is a rigid/flex BGA interposer that enables probing of chip down DDR4 DRAM (x4 or x8) directly at the ball grid array using Keysight logic analyzers.

W4643A includes

• DDR4 78-ball, x4/x8, 2-wing BGA interposer
• 78-ball riser for devices under test that have components surrounding the DDR4 x4/ x8 DRAM to be probed when the surrounding components are too close to install the W4643A without the riser. The riser includes a ground plane. Riser orientation is critical for proper operation

W4643A requires

• One U4208A 61-pin ZIF probe/cable to connect between the left wing of the W4643A BGA interposer and compatible logic analyzer
• One U4209A 61-pin ZIF, probe/cable to connect between the right wing of the W4643A BGA interposer and compatible logic analyzer
• One U4164A logic analyzer module in a chassis with host controller

Optional for the W4643A

•  One DDR4 78 ball riser (included) for devices under test that have components surrounding the DDR4 x4/x8 DRAM to be probed, where the surrounding components are too close to install the W4643A without the riser
•  The DDR4 78-ball riser may be replaced with an optional grypper socket that is sold separately: http://www.hsiotech.com/products/released-products/engineering-products/grypper-family

W4640 Series DDR4 BGA Interposers and 61-pin ZIF Probe/Cables W4643A: DDR4 x4/x8 BGA Interposer 2-wing, 3.2 Gb/s (Continued)

Signals probed

The BGA interposer solutions provide access to the DDR4 signals highlighted below and pass all power and ground signals between the system and memory chip.

Signal access

All signals, including power and ground signals, are passed between the system and memory chip. The W4643A includes a VDDQ plane on the top layer. There are four capacitor footprints to allow the user to add power filter capacitors on VDDQ if the system under test requires additional power filtering.

The following signals are omitted from the logic analyzer connection for the W4643 x4/ x8 BGA interposer systems:

•  Address signal group
•  None
•  Control and other signals group
•  VREFCA, – TEN, ZQ
•  Data signal group
•  None

DDR4 device power is not monitored by the logic analyzer. Power is passed through the interposer through vias. The interposer includes multiple ground planes. Interposers are delivered with RC (resistor/capacitor) networks for logic analyzer probing installed on top of each W4643A.