W83977EG-AW

Specialized Overview

The W83977EG-AW is an ISA I/O controller integrating a floppy disk drive adapter, two UARTs, parallel port, keyboard controller, and ACPI support. It features a 128-BFQFP package with a 5V supply voltage. The device supports four floppy drives (360K to 2.88M) with transfer rates up to 2 Mb/s. Two 16550-compatible UARTs provide baud rates up to 921 kbps. The parallel port supports SPP, BPP, EPP, and ECP modes. It includes an 8042-based keyboard controller, 14 GPIO ports, and OnNow wake-up capabilities.

Specialized Feature Summary

• Integrates floppy disk drive controller compatible with industry standard 82077/765 supporting multiple drive formats and data rates.
• Provides two high-speed serial communication ports with 16-byte FIFOs and programmable baud rate generators.
• Supports Enhanced Parallel Port (EPP) and Extended Capabilities Port (ECP) with extension floppy disk drive modes.
• Includes 8042-based keyboard controller with PS/2 mouse support and configurable Plug-and-Play registers.

Specialized Applications

• ISA bus based computer systems requiring integrated I/O functionality
• Legacy PC hardware designs compliant with Microsoft PC98 Hardware Design Guide
• Systems requiring ACPI power management and OnNow wake-up events

Specialized Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm the specific suffix AW corresponds to the required package and temperature range. Check for end-of-life status as availability may be limited. Ensure compatibility with existing ISA bus architectures before procurement.

Specialized Selection Notes

Select this component for legacy ISA systems needing integrated FDC, dual UART, and parallel port functions. Compare against W83977AF, W83977F, and W83977TF for pin compatibility. Verify that the 128-BFQFP package fits the PCB layout constraints. Ensure the system design accommodates the single 24/48 MHz clock input requirement.

Specialized Part Context

This part belongs to the W83977 series of Super I/O controllers. It evolves from the W83877F design, adding ACPI and enhanced parallel port features. The EG variant typically denotes specific package or temperature characteristics within the family. It shares pin assignments with other W83977 models for design flexibility.

Specialized Replacement Considerations

Direct replacements include W83977EF-AW, W83977AF, W83977F, and W83977TF due to identical pin assignments. Verify software compatibility and configuration register settings when substituting these variants in existing designs.