W9425G6JH
1 1.8  Table 8: Overshoot/Undershoot Specification f o r Data, Strobe, and Mask Pins
PARAMETER
SPECIFICATION
DDR500 DDR400
Maximum peak amplitude allowed for overshoot
Maximum peak amplitude allowed for undershoot
The area between the overshoot signal and VDD must be less than
or equal to Max. area in Figure 4
The area between the undershoot signal and GND must be less than
or equal to Max. area in Figure 4
VDD
Overshoot
5
1.2 V
1.2 V
2.4 V-nS
2.4 V-nS
1.2 V
1.2 V
2.4 V-nS
2.4 V-nS
4
3
2
1
0
-1
-2
Max. area
Max. amplitude = 1.2V
-3
-4
-5
Max. amplitude = 1.2V
GND
0
0.5 1.0 1.42 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 5.68 6.0 6.5 7.0
Time (nS)
Undershoot
Figure 4: DQ/DM/DQS AC Overshoot and Undershoot Definition
Publication Release Date: Aug. 27, 2013
- 31 -
Revision A03
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