AMD-756

The Viper Peripheral Bus Controller, a part of the AMD-750 chipset, is a highly integrated system solution designed to deliver exceptional performance for systems based on the AMD Athlon processor and other compatible processors. Here are some key features of the AMD-756 Peripheral Bus Controller:

1. Integrated ISA Bus Controller:

   • Contains an integrated ISA bus controller for legacy support and compatibility with older hardware.

2. Enhanced Master-Mode PCI IDE Controller:

   • Supports Ultra DMA-33/66 for faster data transfers.
   • Offers dual-drive ports for primary and secondary devices.
   • Supports various data transfer modes, including PIO modes 1-4, multi-word DMA mode-2, and ultra DMA-66.
   • Features 16-level doubleword prefetch and write buffers.
   • Provides bus master programming interface for compliance with standards.
   • Supports ATAPI-compliant devices.
   • Complete bus mastering software driver support.

3. USB Controller:

   • Includes a USB controller compliant with USB 1.0 and OHCI standards.
   • Features a 16-level doubleword FIFO for burst PCI bus access.
   • Provides a root hub and four USB ports.
   • Offers legacy keyboard and PS/2 mouse support.

4. Keyboard/Mouse Controller:

   • Integrates a keyboard controller with PS/2 mouse support for input device compatibility.

5. Real-Time Clock:

   • Includes an integrated real-time clock with an extended 256-byte CMOS RAM.

6. PCI-to-ISA Bridge:

   • Compliant with PCI 2.2 specifications.
   • Features an eight-level doubleword buffer between PCI and ISA buses.
   • Supports dual cascaded AT-8259-compatible interrupt controllers.
   • Includes dual AT-8237-compatible DMA controllers.
   • Provides support for Type F DMA transfers.
   • Allows for ISA legacy distributed DMA across the PCI bus.
   • Supports various other legacy features such as AT-8254-compatible programmable interval timer and integrated keyboard controller.

7. Plug-n-Play Support:

   • Supports PCI interrupts that can be steered to different interrupt channels.
   • Compliant with Microsoft Windows 98 and plug-n-play BIOS standards.
   • Serial IRQ compliant for improved hardware management.

8. Power Management:

   • Supports advanced configuration and power interface power management (ACPI 1.0 compliant).
   • Also supports legacy power management (APM 1.2 compliant).
   • Enables soft-off and power-on suspend with hardware automatic wakeup.
   • Features timers for system inactivity, APCI-compliant timers, and external modem-ring input for system wakeup.
   • Offers various power management modes, including normal, doze, sleep, suspend, and conserve modes.
   • Provides multiplexed general-purpose I/O pins for flexibility.
   • Implements SMBus for DIMM identification and on-board device power/thermal control.