DESIGN GUIDELINES
Figure 6-25. IBIS Simulation for on-board SDRAM / 90MHz
(V)
MCLKI
3
MCLKI
MCLKx
2
2.0 V
833ps
1
0.8 V
791ps
Time
Figure 6-26. Recommended topology for DIMM (IBIS model)
Buffer out
Buffer out
22 Ohms
18 Ohms
3000 mils
2000 mils
Track impedance= 75 Ohms
Trace thickness = 0.72 mil
Trace width = 4 to 8 mils
MCLKI
DIMM
96/111
Issue 1.0 - July 24, 2002