Frequently Asked Questions - FS2336

FS2336 DDR1 400 DIMM Analysis Probe

Q. Which DIMMs does your FS2336 DDR Analysis Probe support?

A. The FS2336 supports registered and non-registered DIMMS. Both x4 and x8 SDRAMS are supported. The probe fits in a standard 184-pin DIMM socket.

Q. How does the Keysight logic analyzer connect to the FS2336 DDR Analysis Probe?

A. The FS2336 attaches to the logic analyzer with a Termination Adapter. Three are available. The Keysight E5378A attaches to a 16753A-756A, 16760A, or 16950A. The Keysight E5385A attaches to a 16717, 16740, 16750-752, or 16910-911. The FS1026 is similar to an E5378A and attaches to a 16753A-756A, 16760A, or 16950A, but makes a right angle turn at the connector. This one is recommended when you are probing next to an adjacent DIMM. The necessary impedance matching networks are included in the adapters.

Q. Why does the FS2336 take four logic analyzer cards when it only requires four termination adapters?

A. The FS2336 requires up to four logic analyzer cards depending on whether protocol analysis (double probed) or timing analysis is being used, and the type of logic analyzer card being used. A fifth card may be required if all signals must be observed simultaneously. The customer will need 4 cards/8 pod pairs/16 pods and 4 - E5378 or 4 - FS1026 termination adapters:
*2 cards/4 pod pairs/8 pods are needed for the data and command bus
*1 card/2 pod pairs consumed by the new internal double probing system (multiplexing) for data bus only
*1 card/ 1 pod pair consumed by Turbo Mode for the data bus

This totals 4 cards/7 pod pairs/14 pods used by this configuration

There is an optional 5th card + 1 termination adapter (using 1 pod pair for signals + 2nd pod pair for internal double probing system

PLEASE NOTE: using the FS2336 may require a 16700 operating system update. Please contact FuturePlus for details.

Why can't I use a 16750-752 class of logic analyzer module with the FS2336? The 16750-752 modules are spec'ed at 400 MT/s which is what the DDR400 bus operates at.

A. Good question. The FS2336 is supported at 400 MT/s with the 16753-756 because of the data valid requirements of the DDR400 bus. The DDR400 bus data valid window can be as low as 900 ps. The 16750-752 cards require a minimum of 1200 ps. The 16753-756 can operate as low as 800 ps. If your data valid window on your bus is higher than 1200 ps you may be able to use the 16750-752 cards. In this case you need to use the Keysight E5385A termination adapters, which may pose a mechanical interference problem. The FS1026 termination adapter was designed to work with the 16753-756 cards and makes a 90 degree bend at the probe, thus resolving the potential mechanical interference problem.

Q. Can the FS2336 perform Eye Scan measurements?

A. The FS2336 can do Eye Scan for Command activity clocked by CK0. If the target can generate just Read or Write activity, then a data strobe signal (DQS2, DQS7, or DQS17) can be used to clock EyeScan for the data signals.

Q. Does the FS2336 DDR Protocol Decoder display ECC? If so, what information is displayed?

A. Yes. The FS2336 Protocol Decoder displays the ECC bits along with the data. After the data is displayed we output CB=XX where XX is the value of the ECC bits in hex.

Q. What software is included with the FS2336 DDR Analysis Probe?

A. Files are included that automatically set up your Keysight logic analyzer for protocol decode or timing analysis mode and label all the signal names. Another file is the protocol decoder, which translates the signals into bus transactions.

Q. Does your probe get its power from my system?

A. No. All necessary power is supplied by the logic analyzer.

Q. How do I find out what are the latest versions of Keysight logic analyzer operating software?

A. Contact your nearest Keysight Call Center.

Q. How do I know which Keysight logic analyzer is best for my needs?

A. Click here.

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Parent Category: FAQ