Agilent Technologies FS2334 user manual TimingZoom Analysis, Decoding DDR Commands

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TimingZoom Analysis

The TimingZoom feature of the 1690x logic analyzer allows for efficient timing analysis of all the signals on the DDR2 DIMM bus.

Please refer to the “Setting up the 16900 Analyzer” section of this manual on the use of the general purpose probe feature to determine how to attach the logic analyzer to the probe.

Load the logic analyzer configuration file for timing, FS234_2. It doesn't matter whether you select to load "Configs only" or "Configs and Data". You are now ready to start making measurements.

For timing analysis operation above 600 MHz you need to use the ½ Channel Timing Mode, which provides bandwidth to 1.2GHz. This mode makes every other pod available to the user so 4 cards are required. These must be configured via the cables supplied with the cards as a single logic analyzer module. Refer to the appropriate Agilent Technologies manual for information on how to connect analyzer cards together to create multi-card modules.

Please note that 6 of the ECC bits and their Data Strobe (DQS8) are contained on an extra Header (#14), which will require an additional logic analyzer card in order to probe.

Decoding DDR Commands

No Protocol Decoder is used for timing analysis. However, symbols are pre-defined for the DDR2 Command bus. These decode the RAS, CAS, and WE lines to display the DDR Command as “Read”, “Write”, etc., so you don’t have to refer to the DDR chip data sheet to see what command is being executed. These decoded values are displayed by setting the display base (in the listing window) or the label property (in the waveform window) to “Symbols”. The display base defaults to hexadecimal.

Taking a Trace, Triggering, and Seeing Measurement Results

Timing analysis is the simplest setup and there are no special factors involved in analyzer trigger setup, initiating a trace, and viewing results. For the Command bus you can use the pre-defined symbols to specify mnemonically the command you wish to trigger on. These are set up by default and are accessible in the trigger tab. The default waveform display also shows DDR Commands mnemonically.

You may setup a trigger, initiate a measurement, and view results in the usual ways via the trigger tab, pressing the Run button, and opening the desired display window.

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Contents DDR2 Dimm High Speed Probe FS2334 Product Warranty Appendix For Sales and Marketing Support For Technical SupportExclusive Remedies Product WarrantySoftware License Agreement Definitions IntroductionProbe Components Probe Technical Feature SummaryFS2334 Probe Description Connecting the DDR2 Probe to the Logic Analyzer Signal Assignments on Probe PodsSignal Threshold Voltage Settings Test Points Buffered signals on the probe Connecting to your Target SystemSignal Isolation on the Probe Write state analysis Page 169xx Licensing Setting up the 169xx AnalyzerSoftware Requirements Offline Analysis Page Taking a Trace, Triggering, and Seeing Measurement Results Decoding DDR CommandsTimingZoom Analysis Overview State AnalysisState Analysis Operation Read and Write at 667MT/s or slower Process for setting sampling positions at speeds of 800MT/s State analysis calibration procedure Page Page Adjusting the sampling positions with controlled stimulus Page State Display Loading the FS1140 FS1140 Installation and LicensingSetting up the FS1140 DDR2 Tool Statistics Timing Analysis ExportPage Appendix Header 1 CommandDP16P/ CLK CK0 Header 2 Command NC3 Header 3 Write DQ9 Header 4 Write Ground D13 DQ22 20K ohm to D14 DQ18 D15 DQ23 Header 5 Write CB0 CB1 20K ohm to Ground D13 No connection D14 D15 Header 6 Write DM5DQS14 Header 7 -Write 20K ohm to Ground D13 DQ50 D14 DQ55 D15 DQ51 Header 8 Write SDA Header 12 Read Duplicates only data signals 20K ohm to Ground D15 No connection Header 10 Read Duplicates only data signals DP16P/ CLK CB7 Header 11 Read Duplicates only data signals DP16P/ CLK RAS Header 9 Read Duplicates only data signals DP16P/ CLK CK2 Header 13 Read Duplicates only data signals Ground D13 DQ50 20K ohm to D14 DQ55 D15 DQ51
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