16
Data Timing Tests
272
DDR2(+LP) Compliance Testing Methods of Implementation
tDH(derate), Differential DQ and DM Input Hold Time with Derating Support - Test Method of
Implementation
The purpose of this test is to verify that the time interval from the data or data mask (DQ/DM
rising/falling edge) hold time to the associated DQS crossing edge is within the conformance limits
as specified in the JEDEC specification.
Signals of Interest
Mode Supported: DDR2, LPDDR2
Signal cycle of interest: WRITE
Signal(s) of Interest:
• Data Signal (supported by Data Strobe Signal)
• Data Mask Signal
Optional signal(s):
• Chip Select Signal (this signal is used to separate DQ signals from different rank of memory)
Signals required to perform the test on the oscilloscope:
• Data Signal, DQ or Data Mask Signal, DM
• Data Strobe Signal, DQS (this must use a differential DQS connection)
• Chip Select Signal, CS (optional)
Test Definition Notes from the Specification
Table 186
Timing Parameters by Speed Grade (DDR2-400 and DDR2-533) & (DDR2-667 and DDR2-800)
Parameter
Symbol
DDR2-400
DDR2-533
Units
Specific Notes
Min
Max
Min
Max
DQ and DM input hold time (differential strobe)
tDH(base)
275
x
225
x
ps
6,7,8,21,28
Parameter
Symbol
DDR2-667
DDR2-800
Units
Specific Notes
Min
Max
Min
Max
DQ and DM input hold time
tDS(base)
175
x
125
x
ps
6,7,8,21,28,31
Table 187
DDR2-400/533 tDS/tDH derating with differential data strobe
∆
tDS,
∆
tDH derating values for DDR2-400, DDR2-533 (All units in ‘ps’; the note applies to the entire table.)
DQS, DQS Differential Slew Rate
4.0 V/ns
3.0 V/ns
2.0 V/ns
1.8 V/ns
∆
tDS
∆
tDH
∆
tDS
∆
tDH
∆
tDS
∆
tDH
∆
tDS
∆
tDH
DQ Slew Rate V/ns
2.0
125
45
125
45
125
45
-
-
1.5
83
21
83
21
83
21
95
33
1.0
0
0
0
0
0
0
12
12
0.9
-
-
-11
-14
-11
-14
1
-2
0.8
-
-
-
-
-25
-31
-13
-19
Содержание D9020DDRC
Страница 1: ...Keysight D9020DDRC DDR2 LP Compliance Test Application Methods of Implementation ...
Страница 10: ...10 DDR2 LP Compliance Testing Methods of Implementation ...
Страница 40: ...1 Installing the DDR2 Compliance Test Application 40 DDR2 LP Compliance Testing Methods of Implementation ...
Страница 46: ...2 Preparing to Take Measurements 30 DDR2 LP Compliance Testing Methods of Implementation ...
Страница 70: ...3 Measurement Clock Tests 54 DDR2 LP Compliance Testing Methods of Implementation ...
Страница 134: ...6 Single Ended Signals VIH VIL Data Mask Tests 118 DDR2 LP Compliance Testing Methods of Implementation ...
Страница 158: ...9 Single Ended Signals Overshoot Undershoot Tests 142 DDR2 LP Compliance Testing Methods of Implementation ...
Страница 186: ...10 Differential Signals AC Input Parameters Tests 170 DDR2 LP Compliance Testing Methods of Implementation ...
Страница 224: ...14 Clock Timing CT Tests 208 DDR2 LP Compliance Testing Methods of Implementation ...
Страница 270: ...15 Data Strobe Timing DST Tests 254 DDR2 LP Compliance Testing Methods of Implementation ...
Страница 342: ...17 Command and Address Timing CAT Tests 326 DDR2 LP Compliance Testing Methods of Implementation ...
Страница 366: ...19 Calibrating the Infiniium Oscilloscope and Probe 350 DDR2 LP Compliance Testing Methods of Implementation ...