Intel IXP46X Manuel d'utilisateur télécharger pdf (Page 106)

Intel

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

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)

1 2 ... 101 102 103 104 105 106 107 108

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Intel IXP46X Manuel d'utilisateur Page 106