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Intel
®
820E Chipset
R
Design Guide 55
Figure 33. High-Speed CMOS Termination
high_spd_cmos_term
MCH
RIMM
_
0
RIMM
_
1
91 Ω
Vterm
39 Ω
R1
R2
2.7.4.1. SIO Routing
The SIO signal must be routed from RIMM to RIMM, as shown in Figure 34. The SIO signal requires a
2.2 kΩ to 10 kΩ terminating resistor on the SOUT pin of the last RIMM. SIO is routed with a standard
5 mil-wide, 60 Ω trace. The motherboard routing lengths for the SIO signal are the same as those for
RSL signals. (See Figure 34.)
Figure 34. SIO Routing Example
A
B
0" - 3.50"
0.4" - 0.45"
SIN B36
SIN B36
A36 SOUT
A36 SOUT
2.2KΩ -
10KΩ
sio_route.vsd
82820
MCH
N
3
2
1
N
3
2
1