Intel IXP46X Manual do Utilizador descarregar pdf (Página 104)

Intel

IXP45X and Intel

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

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

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