QPHY-DDR4 Software Option
TABLE OF CONTENTS
Introduction to Qualiphy DDR4 ................................................................................................ 6
Required Equipment ..................................................................................................................................... 6
Using Qualiphy DDR4 ............................................................................................................... 7
QualiPHY Compliance Test Platform ....................................................................................... 8
Oscilloscope Option Key Installation ........................................................................................................... 10
Typical (Recommended) Configuration ....................................................................................................... 10
Remote (Network) Configuration ................................................................................................................ 10
Oscilloscope Selection ................................................................................................................................ 10
Accessing the QPHY-DDR4 Software using QualiPHY .............................................................................. 11
Customizing QualiPHY ................................................................................................................................ 13
Creating Custom Configurations ................................................................................................................. 14
QPHY-DDR4 OPERATION ......................................................................................................................... 16
QPHY-DDR4 Measurement Preparation ................................................................................ 17
Deskewing the Probes ................................................................................................................................ 17
Connecting the Probes ................................................................................................................................ 19
Read (R) and Write (W) Burst Requirements ............................................................................................. 19
Initial Signal Checking ................................................................................................................................. 21
QPHY-DDR4 Test Configurations .......................................................................................... 23
QPHY-DDR4 Variables ............................................................................................................ 24
QPHY-DDR4 LIMIT SETS ........................................................................................................ 28
QPHY-DDR4 Test Descriptions .............................................................................................. 29
Clock Tests (Ck Diff) .................................................................................................................................... 29
Eye Diagram Tests (CKdiff-DQSdiff-DQse) ................................................................................................. 38
Write Bursts (Inputs) - DQ and DQS Eyes .......................................................................................... 38
DQ Input Compliance Mask ................................................................................................................. 39
VIHL_AC, DQ AC Input Swing Pk-Pk .................................................................................................. 40
Read Bursts (Outputs) - DQ and DQS Eyes ....................................................................................... 41
VOHL_AC, DQ AC Output Swing Pk-Pk ............................................................................................. 42
Electrical Tests (CKdiff-DQSdiff-DQse) ....................................................................................................... 43
SRIN_dIVW, Input Slew Rate .............................................................................................................. 43
tDVAC, Time Above AC Level ............................................................................................................. 47
AC Overshoot/Undershoot ................................................................................................................... 48
SRQ, Output Slew Rate ....................................................................................................................... 51
Timing Tests (CKdiff-DQSdiff-DQse) ........................................................................................................... 53
tDQSQ_total, DQS to DQ Skew .......................................................................................................... 53
tQSH/tQSL, DQS Output High/Low Time ............................................................................................ 55
tQH_total, DQ Output Hold Time ......................................................................................................... 56
tDQSCK, CK to DQS Skew ................................................................................................................. 57
tHZ/tLZ, High/Low Impedance Time .................................................................................................... 59
tRPRE/tRPST, Read Pre/Postamble Time .......................................................................................... 61
tDQSS, CK to DQS Skew .................................................................................................................... 62
tDQSH/tDQSL, DQS Input High/Low Pulse Width .............................................................................. 64
tDIPW, DQ Input Pulse Width .............................................................................................................. 65
tDSS/tDSH, DQS to CK Setup/Hold Time ........................................................................................... 66
Tdqs/Tdqh, DQ to DQS Setup/Hold Time ........................................................................................... 68
tWPRE/tWPST, Write Pre/Postamble Time ........................................................................................ 69
Appendix A: File name conventions for saved waveforms .................................................. 71
Appendix B: Common WaRning Messages .......................................................................... 72
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