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Hypertransport Analysis Probes
For Use With Keysight Logic Analyzers

Analyzes a HyperTransport link at these data transfer rates:

Model Number
Data Transfer Rate


2.4 GT/s
400 MT/s
2.4 GT/s
No longer available.
2.4 GT/s
  • Bus transactions displayed in HyperTransport mnemonics
  • Convenient logic analyzer connection to HyperTransport link
  • Supports both 8- and 16-bit full-duplex operation
  • Logic analyzer configuration software gets you up and running fast.
  • HyperTransport protocol transaction software executes on Keysight 16700- and 16900-series logic analyzers

Multiple Product Versions to Match Your Specific Need...
Note: Please be sure to read our application note Designing Your Own Physical Connection To A HyperTransport Link For Use With FuturePlus HyperTransport Analysis Tools, available in the FS2240 Library.

Mechanical and Electrical
The FS2240, FS2241, FS2243 and FS2244 use connection solutions that are are reliable and easy to connect and disconnect. It is also important to minimize the amount of target board space required for the connections.

The analysis probe must insure maximum signal integrity and provide the highest bandwidth for the HyperTransport link. In order to perform deserialization to capture packets and present them to the logic analyzer the signals must be converted from serial to data packets. To accomplish this, timing is critical and must not be distorted. Clock to data skew must be minimized. TCADV, the timing of CAD/CTLOUT to CLKOUT, has a nominal value of 250 ps for a 1600 MT/s (800 MHz clock) data rate.

Protocol Decode
Protocol decoding consists of deserialization of the CAD stream from 8 or 16 bits and conversion into 32-bit packets within the analysis probe. The 32-bit packets are then transmitted to the Keysight logic analyzer where the FuturePlus protocol decode software (also included with the product) decodes the captured CAD words to display the commands, data and CRC's on the logic analyzer display. The protocol decode software has complete knowledge of the HyperTransport 2.0 protocol.

Connection To HyperTransport Links
Since HyperTransport is a chip-to-chip architecture and does not normally include connectors, test connectors must be designed into the target system to provide for debug, verification and validation. Connectors are chosen to minimize board space and are typically surface mounted to leave the inner layers free for routing.

The HyperTransport analysis probes are designed so that they can capture one 8-bit transmit path and one 8-bit receive path or one 16-bit path. For 16-bit links two analysis probes are required to simultaneously capture both transmit and receive data.

Please Note: FS2240-series require critical compliance to special layout requirements to insure correct HyperTransport transactions will be received. For details, please go to the HyperTransport Library fot the Design Note, Designing Your Own Physical Connection To A HyperTransport Link For Use With FuturePlus HyperTransport Analysis Tools.

FS2240 - 80 Pin Connector
The FS2240 uses a single non-intrusive 80-pin 3M high-density connector for probing a HyperTransport link. This connection solution is best used on six layer or greater boards.

A single connector provides connection for an 8-bit TX and RX path. To measure both directions of a 16-bit link another FS2240 is required. The connector is supplied by 3M and the part number is TS-1150.

Tip resistors must be placed on the board-under-test. This is required to provide proper termination. Please Note: The FS2240, requires critical compliance to special layout requirements to insure correct HyperTransport transactions will be received. Please see the HyperTransport System Requirements page to view these requirements.

FS2241 - Two Samtec Connectors
The FS2241 uses two Samtec ASP-65067-01 connectors for probing a HyperTransport link. This is useful for probing four-layer target boards.

For 8-bit links, one connector attaches to the TX path, and the other carries the RX path. To measure both directions of 16-bit links requires two FS2241 probes.

The Samtec connectors place the tip resistors in the probe cable instead of on the target. The added length through the connector to the tip resistors on the cable, and the unbalanced trace lengths limit the FS2241 bandwidth to 400 MT/s (200 MHz clock rate).

The smaller connectors, simplified routing, and the ability to place the connectors on top and on the bottom of the printed circuit board provides maximum flexibility in connector placement.

FS2243 and FS2244 - Connectorless Probing
The FS2243and FS2244 use an industry standard connectorless method (Keysight soft touch or soft touch pro technology) for probing a HyperTransport link

A connectorless probing solution requires the designer only to place solder pads on the traces of the link. This method is easier to implement on targets with low layer counts and tight space requirements. Click here to see the differences between the FS2243 and FS2244 footprints.

For 8-bit links, one connector attaches to the TX path, while another connector carries the RX path. For a 16-bit link both connectors are used for either TX or RX.

This probing solution also can be implemented using standard PCB pad features and can therefore be designed into a target board at no additional cost. Connectorless probing does not require tip resistors on the target and only brings 10 bits to each of the two probing locations required for each link. This probing method is capable of operating with a 1.2 GHz clock (2.4 GT/s data rate).

Power Requirements
All necessary power for the FS2240, FS2241, FS2243, and FS2244 is supplied by an internal power supply. No power is drawn from the logic analyzer or the target system.

Interfacing to the logic analyzer
The logic analyzer cables connect to the rear panel of the analysis probe via termination adapters. For connection to the 16717, 16750-752, and 16910-911 logic analyzer modules, the Keysight E5385A termination adapter is needed. For connection to the 16753-756, 16760, and 16950 logic analyzer modules, the Keysight E5378A termination adapter is needed. These termination adapters are not included with the analysis probe and must be ordered separately from Keysight Technologies.

The software included with the analysis probe contains complete logic analyzer configuration files and a FuturePlus HyperTransport protocol decoder for the Keysight logic analyzer. The protocol decoder displays bus transactions in clearly understood HyperTransport mnemonics.

Front Panel Switch
A front panel switch is used to select 8-bit or 16-bit operation. If two analysis probes are being used in the 16-bit mode, both must have the switch set to 16-bit operation.

Cross-Bus and Cross-Domain Analysis
Are you analyzing data in multiple buses or domains? Simply use the HyperTransport analysis probe to monitor your HyperTransport link, and then use another FuturePlus analysis probe to monitor another bus in your system. FuturePlus offers analysis probes for most popular buses. You can create your own custom measurement system, perform cross-domain triggering between buses, and view data from multiple buses simultaneously in the same display. Similarly, you could connect an analysis probe for your host processor to another logic analyzer card. You could then use Keysight’s Software Analyzer (B4620A) to view source code, code execution, and the corresponding HyperTransport traffic simultaneously.

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