Intel 31244 PCI-X manual Extended Voltage Mode Driver Model, Extended Mode Driver

Intel® 31244 PCI-X to Serial ATA Controller

Test Methodology

10.1.2Extended 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.

Figure 26. Extended Mode Driver Example

	0.3
	0.2
	0.1
(V)
Voltage	0
	0	100	200	300	400	500	600
	-0.1
	-0.2
	-0.3

Time (ps)

old_ideal_S

new_ideal_S

B0429-01

Table 29.	Extended Mode Driver
	Parameter	Value
	Vdiff,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

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.

64 Design Guide