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PENTIUM® PRO PROCESSOR AT 150, 166, 180, and 200 MHz
REF8N Topology:
0.10 in.
0.9 in.
1.02 nS/ft.
3.08nS/ft.
4 pF
200 ohms
42 ohms
0.10 in.
0.9 in.
1.02 nS/ft.
3.08nS/ft.
4 pF
200 ohms
42 ohms
0.9 in.
2.4nS/ft.
6.5 pF
75 ohms
0.9 in.
2.4nS/ft.
6.5 pF
75 ohms
4.4.1.
Ref8N HSPICE Netlist
$REF8N, Rev 1.1
Vpu vpu GND DC(vtt)
rterm PU1 vpu (R=42)
crterm PU1 vpu 2PF
TPU PU1 0 line1 0 Z0=72 TD=.075NS
X1 line1 load1 socket
T1 load1 0 load1a 0 Z0=42 TD=230PS
T2 load1a 0 CPU_1 0 Z0=200 TD=8.5PS
CCPU_1 CPU_1 0 4PF
T3 line1 0 line2 0 Z0=72 TD=568PS
x2 line2 load2 socket
T4 load2 0 load2a 0 Z0=42 TD= 230ps
56
1.5 volts
42 ohms
2 pF
1.8 nS/ft.
0.5 in.
0.07 in.
0.105 in.
72 ohms
2.1nS/ft.
1.4nS/ft.
2.2 nS/ft.
4 pF
40 ohms
66 ohms
3.1 in.
72 ohms
0.07 in.
0.105 in.
2.1nS/ft.
1.4nS/ft.
2.2 nS/ft.
4 pF
40 ohms
66 ohms
3.1 in.
72 ohms
0.25 in.
2.4 nS/ft.
2.2 nS/ft.
50 ohms
2.2 in.
72 ohms
0.25 in.
A5
2.4 nS/ft.
50 ohms
Place ASIC driver
to be tested here
Figure 36. Ref8N Topology
$ Pull-up termination resistance
$ Pull-up termination capacitance
$ PCB link from terminator to load 1
$ Socket model
$ CPU package model
$ Bondwire
$ CPU input capacitance
$ PCB trace between packages
$ Socket model
$ CPU worst case package
42 ohms
0.10 in.
0.9 in.
0.07 in.
0.105 in.
1.02 nS/ft.
3.08nS/ft.
2.1nS/ft.
1.4nS/ft.
200 ohms
42 ohms
40 ohms
66 ohms
0.10 in.
0.9 in.
0.07 in.
0.105 in.
1.02 nS/ft.
3.08nS/ft.
2.1nS/ft.
1.4nS/ft.
200 ohms
42 ohms
40 ohms
66 ohms
0.9 in.
0.25 in.
2.4nS/ft.
2.4 nS/ft.
6.5 pF
75 ohms
50 ohms
0.9 in.
0.25 in.
2.4nS/ft.
2.4 nS/ft.
6.5 pF
75 ohms
50 ohms
Replace with ASIC pkg model
E
1.5 volts
2 pF
1.8nS/ft.
0.5 in.
72 ohms
2.2 nS/ft.
3.1 in.
72 ohms
2.2 nS/ft.
2.2 in.
72 ohms
2.2 nS/ft.
2.2 in.
72 ohms
2.2 nS/ft.
2.2 in.
72 ohms
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