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PA-RISC Chipsets

Astro chipset

Some PA-8500, PA-8600 and PA-8700 systems use a rope-based architecture with Astro as main system controller and IOMMU, and separate Runway+/Runway DDR buses with I/O devices controlled by Elroy PCI bridges.

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Elroy

Elroy is a PCI bus bridge that attaches one PCI bus to one or more I/O ropes. Elroy was often used with the Astro memory and I/O controller.

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Used in

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References

  1. Astro External Reference Specification Introduction
    Astro External Reference Specification Error Handling
    Astro External Reference Specification R2I Operations
    Astro External Reference Specification Register Map
    Astro External Reference Specification Runway Interface
    Astro External Reference Specification Memory Map
    Hewlett-Packard Company (February 2000, Revision 1.2)
  2. Elroy ERS (External Reference Specification) — Ropes to PCI Bridge Chip Hewlett-Packard Company (January 2000, Revision A (1.4))

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