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Intel
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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
100 Document Number: 305261, Revision: 004
7.2.4 Command Group
The command signal group includes the signals DDRI_MA[13:0], DDRI_BA[1:0],
DDRI_RAS, DDRI_CAS and DDRI_WE. The following simulations were constructed for
the 2 bank x16 device configuration where each signal would have six receivers.
Table 39 identifies the transmission line lengths for the address (DDRI_MA3) topology
shown in Figure 45 and Figure 47. These lengths were chosen as realistic goals given
the IXP45X/IXP46X network processors to DDR body to body separation of no more
than 500 mils.
Table 39. Command Group Topology Transmission Line Characteristics
Transmission Line Length
TL1 (T
pd
= 175 ps/in) ~ 600 mils
TL2 (T
pd
= 175 ps/in) ~ 50 mils
TL3 (T
pd
= 175 ps/in) ~ 1,100 mils
TL4 (T
pd
= 175 ps/in) ~ 50 mils
TL5, TL8, TL11 (T
pd
= 175 ps/in) ~ 800 mils
TL6, TL7, TL9, TL10, TL12, TL13 (T
pd
= 175 ps/in) ~ 300 mils