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Design Guide 47
Intel
®
31244 PCI-X to Serial ATA Controller
PCI-X Layout Guidelines
PCI-X Layout Guidelines 7
This section provides guidelines for designing with the Intel
®
31244 PCI-X to serial ATA
controller PCI/PCI-X (PCI/X) bus interface in your application. This chapter is divided as follows:
• PCI/X voltage levels
• clocking modes
• general layout guidelines
• layout guidelines for the different slot configurations using PCI-X
7.1 PCI Voltage Levels
The Intel
®
31244 PCI-X to serial ATA controller does not support a 5 V PCI signaling interface, it
supports 3.3 V only. Supporting a 5 V PCI interface requires additional I/O level translation
circuitry. Table 18 is provided as a reference for the PCI/X signaling levels. A complete PCI-X
Addendum to the PCI Local Bus Specification, Revision 1.0a may be found on the www.pcisig.com
website.
Table 18. PCI/X Voltage Levels
Symbol Parameter Minimum Maximum Units
V
IL3
Input Low Voltage (PCI-X) -0.5 0.35 V
CC33
Voltage
V
IH3
Input High Voltage (PCI-X/PCI) 0.5 V
CC33
V
CC33
+ 0.5 V Voltage
V
IL4
Input Low Voltage (PCI) -0.5 0.3 V
CC33
Voltage
V
OL3
Output Low Voltage (PCI-X) 0.1 V
CC33
Voltage
V
OH3
Output HIGH Voltage (PCI-X) 0.9 V
CC33
Voltage