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64 Design Guide
Intel
®
31244 PCI-X to Serial ATA Controller
Test Methodology
10.1.2 Extended Voltage Mode Driver Model
The extended voltage mode eye diagram for the new slow driver is shown in Figure 26 with the
SATA driver mode superimposed. The extended voltage mode eye diagram for the driver is also
shown in table format in Table 29.
Note: The simulation using the maximum driver model with this resistor network shown in Figure 13,
resulted in a 50 mV over the specification of 600 mV maximum. It is important to test this
overdrive condition and make sure that the actual overdrive condition does not damage the SATA
disks.
Figure 26. Extended Mode Driver Example
Table 29. Extended Mode Driver
Parameter Value
V
diff,tx
+/- 250 mV differential nominal measured at GD31244 TX pins
T,slew 0.3 UI -0.41 UI
Tjitter 0 - 0.35 UI max
Trise/fall (20-80%) 0.3 UI -0.41 UI
Vmin @ GD31244 pin 800 mV
Vmax @ GD31244 pin 1200 mV
B0429-01
0.3
0.2
0.1
100
0
200 300 400 500 600
-0.2
-0.1
-0.3
0
Voltage (V)
Time (ps)
old_ideal_S
new_ideal_S