The ITE IT8893E/FX is a PCI Express to PCI bridge controller. This chip provides a bridge between a PCI Express host interface and a PCI bus, allowing legacy PCI devices to be used in modern systems that primarily use PCI Express. It's designed for applications requiring compatibility with older PCI cards.

Applications:

• Industrial PCs
• Embedded Systems
• Legacy System Upgrades
• Motherboards with PCI Express and PCI Slots
• Data Acquisition Systems

Features:

• PCI Express Interface: Complies with the PCI Express Base Specification, providing a high-speed interface to the host system.
• PCI Interface: Supports the PCI Local Bus Specification, allowing communication with legacy PCI devices.
• Bus Mastering: Supports bus mastering on both the PCI Express and PCI buses, enabling high-performance data transfers.
• Interrupt Controller: Handles interrupt requests from PCI devices and routes them to the host system.
• Configuration Space: Provides a configuration space for PCI devices, allowing them to be configured by the host system.
• Power Management: Supports power management features to reduce power consumption.

Benefits:

• Legacy PCI Support: Allows the use of legacy PCI devices in modern PCI Express-based systems.
• Increased System Flexibility: Provides a bridge between two different bus architectures.
• High-Performance Data Transfers: Supports bus mastering for efficient data transfers.
• Simplified System Design: Integrates the necessary logic for bridging between PCI Express and PCI buses.
• Reduced System Cost: Provides a cost-effective solution for supporting legacy PCI devices.

Additional Details:

The IT8893E/FX typically operates at 3.3V power supply. The chip is often used in environments where older PCI cards are still needed, such as industrial control systems or data acquisition hardware. Specific PCI and PCI Express link configurations depend on the board design. Datasheets contain details on register settings and PCI device compatibility.