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Intel
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IXP45X and Intel
®
IXP46X Product Line of Network Processors—Category
Intel
®
IXP45X and Intel
®
IXP46X Product Line of Network Processors
HDD February 2007
106 Document Number: 305261, Revision: 004
The simulation results in Figure 50 are for the RCVENIN/RCVENOUT circuit with a 0-Ω
series resistor, the voltage waveform meets the DDR device input voltage
requirements. V
il(max)
of V
ref
– 0.150 or 1.10 V and V
ih(min)
of V
ref
+ 0.150 or 1.40 V
are easily achieved at the receiver (RCVENIN). However, the receiver waveform must
also not exceed a maximum voltage of V
in(max)
= 2.8 V or the minimum voltage of
V
in(min)
= -0.3 V and the waveforms at the IXP45X/IXP46X network processors are
outside of these limits. A different series resistor should be chosen. The results of using
a 60-Ω resistor are shown in Figure 51.
Figure 50. DDR RCVENIN/RCVENOUT Simulation Results (Rseries = 0 Ω)