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IXP45X and Intel
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IXP46X Product Line of Network Processors—Category
Intel
®
IXP45X and Intel
®
IXP46X Product Line of Network Processors
HDD February 2007
104 Document Number: 305261, Revision: 004
The simulation results in Figure 48 are for the RAS circuit, the voltage waveform meets
the DDR device input voltage requirements. V
il(max)
of V
ref
– 0.310 or 940 mV and
V
ih(min)
of V
ref
+ 0.310 or 1.56 V are easily achieved at the receiver (DDR_DEVICE1).
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.
Waveform results for devices DDR_DEVICE2 through DDR_DEVICE6 are not shown as
they are identical to that of device DDR_DEVICE1 due to symmetry. When final routing
data is available, simulation results for all receivers are analyzed as variations in
routing may result in differences. These differences should be minimal.
Figure 48. DDR RAS Simulation Results: Two-Bank x16 Devices