Agilent Technologies user manual Using the FS2331 DDR Probe with an Interposer FS1024/25

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Using the FS2331 DDR Probe with an Interposer (FS1024/25)

An interposer with the FS2331 is recommended if the user wants to see the activity in a specific DIMM slot or with a specific DIMM module. An interposer also provides the advantage of providing valid S0:3 signals to the FS2331, which makes it unnecessary to wire these signals from an adjacent DIMM slot in order to provide accurate Command decode on the FS2331 in those systems where S0:3 qualifies Command activity. The FS1024 and FS1025 interposers are the only interposers recommended for use with the FS2331. The user must be aware that the interposer provides additional trace length to the target system in a manner that the target is not designed for. This may have an impact on signal integrity or system operation.

When the FS2331 probe is used with an FS1024 or FS1025 DIMM interposer the chip select signals for the DIMM installed onto the interposer will automatically become visible to the probe. Most DIMMs will have only one or two ranks of memory, leaving two or three ports available on the probe to monitor the chip select signals for other DIMM slots.

When using an interposer with the FS2331 several jumper changes are needed.

1.Per the table on page 18, the jumpers for the signals S0:3 need to be changed.

2.A jumper needs to be removed from J9. This removes the 120 ohm terminating resistor from the CK0 input receiver on the FS2331 as it is now in parallel with the DIMM module.

DIMM Signal Loading Option

The FS2331 has the capability to add capacitive loading to all the signals on the DIMM bus. This capability may be of interest to users who want to emulate and measure a DIMM bus that may have many DIMM modules loading down Data and Command signals. This loading can be implemented using 0402 surface mount devices which can be soldered onto the FS2331 using existing surface mount pad locations around the top of the board. Please contact the factory for details on the layout of these locations. The FS2331 does not ship with any of these capacitors loaded.

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Contents Revision DDR Sdram Analysis Probe FS2331How to reach us Product Warranty Signal Connections For Sales and Marketing Support For Technical SupportLimitation of warranty Product WarrantyExclusive Remedies Logic Analyzer Modules Probe Cable, Connector NumberingIntroduction DefinitionsFS2331 100 pin Connector to Pod Diagram FS2331 Probe Description Probe Feature SummaryProbe Components DDR Data DDR CommandsProbe Design State Clock GenerationPage Pod Clock Domain Clock Rate Probe Pod AssignmentProbe Switch Settings Switch # Default factory Function PositionOn closed Connecting the Probe to the Logic Analyzer Logic Analyzer Signal Threshold Voltage SettingsConnecting Power to the FS2331 Probe Card Requirements for PC2700 Systems 16753/4/5/6 Logic Analyzer Card RequirementsRecommended 169xx Licensing Setting up the 167xx AnalyzerSetting up the 169xx Analyzer Software Requirements System SoftwareTiming Analysis All DDR speeds and supported analyzer cards Card Configurations for State Analysis Probing multiple DDR busses Interleaved memory If User is dedicating a Connecting to your Target System Chip Select§ Isolate the Dedicated DIMM’s pin Chip Select Jumper locations§ Sleeve the Pin Unused Pods § Wire from the adjacent Dimm slot to the isolated pinOffline Analysis Filtering Taking a Trace, Triggering, and Seeing Measurement Results Loading the Inverse Assembler and Decoding DDR CommandsTiming Analysis Operation State Analysis OperationInverse Assembler and Decoding DDR Commands Tracing the Serial Presence Detect Signals Using Eye Finder with the FS2331 DDR Probe Using EyeScan with the FS2331 Probe Dimm Signal Loading Option Using the FS2331 DDR Probe with an Interposer FS1024/25FS2331 Calibration Page Set Command sample position Page Page Write Burst Data Valid Position Page Page Page Read Burst Data Valid Position Page Page Page Set the final analyzer sample position Adjust the delay line value to maximize R/W overlapPage Standards supported General InformationSamtec Signal Connections J1 DataSA0 CB4 J2 Data and CommandSpare J3 Command and Data Buffcmdclk DM5DQS14 J4 DataDQS7
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