82433LX Datasheet, PDF (30/53 Pages) Intel Corporation – LOCAL BUS ACCELERATOR (LBX)

82433LX 82433NX
3 5 PCI Clock Considerations
There is a 1 25 ns clock skew specification between
the PCMC and the LBX that must be adhered to for
proper operation of the PCMC LBX timing As
shown in Figure 12 the PCMC drives PCLKOUT to
an external clock driver which supplies copies of
PCLK to PCI devices the LBXs and back to the
PCMC The skew specification is defined as the dif-
ference in timing between the signal that appears at
the PCMC PCLKIN input pin and the signal that ap-
pears at the LBX PCLK input pin For both the low
order LBX and the high order LBX the PCLK rising
and falling edges must not be more than 1 25 ns
apart from the rising and falling edge of the PCMC
PCLKIN signal
Figure 12 Clock Considerations
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