The W82C490P-110 is a Micro Channel Architecture (MCA) bus controller manufactured by Winbond Electronics. This chip is designed to manage the interface between a CPU and the MCA bus, which was primarily used in IBM PS/2 computers and some industrial systems. It provides the necessary control signals and arbitration logic for devices on the MCA bus to communicate effectively.

Applications

• IBM PS/2 computers
• Industrial control systems utilizing MCA bus
• Legacy hardware requiring MCA bus interface
• Embedded systems designed around the MCA architecture

Features

• MCA bus interface
• Bus arbitration logic
• DMA controller support
• Interrupt controller interface
• Memory controller interface
• I/O controller interface

Benefits

• Enables communication between CPU and MCA bus devices
• Simplifies system design by providing integrated bus control
• Improves system performance through efficient bus arbitration
• Reduces component count compared to discrete implementations
• Supports a wide range of MCA peripherals

Additional Details

The W82C490P-110 integrates several key functions required for managing the MCA bus, including bus arbitration, DMA control, and interrupt handling. It typically interfaces with the CPU via a local bus and provides the necessary signals to control memory and I/O devices connected to the MCA bus. The chip also supports various MCA features such as Programmable Option Select (POS) and burst mode data transfers. Its operating frequency is specifically designed for systems running at 110 MHz.