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

7.1PCI 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

 

 

 

 

 

 

 

VIL3

Input Low Voltage (PCI-X)

-0.5

0.35 VCC33

Voltage

 

VIH3

Input High Voltage (PCI-X/PCI)

0.5 VCC33

VCC33 + 0.5 V

Voltage

 

VIL4

Input Low Voltage (PCI)

-0.5

0.3 VCC33

Voltage

 

VOL3

Output Low Voltage (PCI-X)

 

0.1 VCC33

Voltage

 

VOH3

Output HIGH Voltage (PCI-X)

0.9 VCC33

 

Voltage

Design Guide

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Intel 31244 PCI-X manual PCI-X Layout Guidelines, PCI Voltage Levels, PCI/X Voltage Levels