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Peripheral Component Interconnect (PCI) System Architecture

Figure 1 shows a typical PCI/PCI-X local bus system architecture and displays the following characteristics:

  • PCI-X primary bus connects to a PCI-X host bridge
  • PCI-X to PCI-X bridge interfaced to a secondary PCI-X bus
  • Disk controller
  • System backplane

Altera's PCI MegaCore® function provides the protocol functionality for both the motherboard's primary and secondary buses.

The disk controller functionality may be integrated with a PCI MegaCore function for a single programmable chip solution. A network adapter card on the system backplane could provide the interface using an Altera® programmable logic device (PLD) and the PCI-X function. The PCI-X architecture enables high-complexity, high-performance systems (66 to 133 MHz) to meet the requirements of both open and embedded systems.

Figure 1. Typical PCI/PCI-X Architecture

Typical PCI/PCI-X Architecture

Table 1 shows the features of the PCI MegaCore functions.

Table 1. PCI MegaCore Functions

Feature PCI/MT64 PCI/MT32 PCI/T64 PCI/T32
Bus Width 64-bit 32-bit 64-bit 64-bit
Frequency 0-66 MHz 0-66 MHz 0-66 MHz 0-66 MHz
Functionality Master/Target Master/Target Target Only Master/Target
Supported Devices FLEX 10KE APEX 20KE ACEX 1K FLEX 10KE FLEX 6000 APEX 20KE ACEX 1K FLEX 10KE APEX 20KE ACEX 1K APEX 20KE
Logic Elements 1,300 900 800 500

The Altera PCI Advantage

The Altera PCI/PCI-X solution provides critical advantages for the system designer. Altera's high-density APEX 20K and APEX 20KE devices enable you to create a single-device programmable solution for both the PCI/PCI-X function and the application-specific logic for a wide range of open and embedded custom solutions. The low-cost ACEX 1K family provides the PCI solution for high volume, low cost PCI 2.2 and CompactPCI systems.

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