Electrical Characteristics
Figure 4-7. PCI-X Mode 1 Input Timing
V_th
V_tl
CLK
V_test
T_h
T_su
V_th
inputs
valid
INPUT
V_test
V_test V_max
V_tl
4.3.3
PCI and PCI-X Clock Specification
Clock measurement conditions are the same for PCI-X devices as for conventional PCI devices in a
3.3V signaling environment except for voltage levels specified in Table 4-20. The same spread-
spectrum clocking techniques are allowed in PCI-X as for 66 MHz conventional PCI. If a device
includes a PLL, that PLL must track the input variations of spread-spectrum clocking specified in
Figure 4-20.
Figure 4-8. PCI-X 3.3V Clock Waveform
T_cyc
T_high
0.6 Vcc
T_low
0.5 Vcc
0.4 Vcc
0.3 Vcc
0.4 Vcc, p-to-p
(minimum)
0.2 Vcc
174
Intel® 6702PXH 64-bit PCI Hub Datasheet
INTEL [ INTEL ]
