82371AB Datasheet, PDF (235/284 Pages) Intel Corporation – PCI-TO-ISA / IDE XCELERATOR PIIX4

E
82371AB (PIIX4)
11.4.3.4.
PCI Clock Stop and Start Timing Relationships
Figure 18 and Figure 19 show the timing relationship for the control of system PCICLK. The system PCICLK
timings must be followed exactly for proper operation of PC/PCI DMA or Serial IRQ logic. If PC/PCI DMA and
Serial IRQs are not used in the system, the system PCICLK stop timings must meet the system developer’s
requirements.
PCI_STP#
PIIX4 PCICLK
System PCICLK
pcistp
Figure 18. PCI Clock Stop Timing
PCI_STP#
PIIX4 PCICLK
System PCICLK
pcistart
Figure 19. PCI Clock Start Timing
PRELIMINARY
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4/9/97 2:23 PM PIIX4aDS
INTEL CONFIDENTIAL
(until publication date)