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- XIO abstract "XIO is a packet-based, high-performance computer bus employed by the SGI Origin 2000, Octane, Altix, Fuel and Tezro machines. The XIO forms a bus between high-performance system devices and the memory controller.XIO is usually used in a star topology, using a router ASIC called Crossbow (Xbow) to connect up to eight fully symmetrical devices in a system (one of them is usually the memory controller / CPU bridge, called HEART in Octane or Hub in Origin). Other devices known to have XIO interfaces are: BRIDGE: XIO to PCI-64 bridge (Octane, Origin) XBRIDGE: XIO to PCI-X bridge (Altix) HQ4: command processor of ImpactSR cards (Octane) KTOWN: frontend for InfiniteReality2 cards (Onyx, Origin variation) XC: Crosstown converter BUZZ: "OpenGL-on-a-Chip" ASIC used in ODYSSEY/VPro graphics (V6/V8/V10/V12)The XIO employs two source-synchronous channels (one in each direction), each 8 or 16 bits wide. They are clocked at 400 MHz to achieve peak rates of 800 MB/s (i.e. in megabytes). Each of the devices can utilize the full bandwidth, as the XBow router prevents collisions by being able to route between any two points.Transfer is organized into micropackets. These contain a total of 128 bits of data and 32 bits of control. The control information encapsulates an 8 bit sideband (used by higher layers for framing), sequence numbers (for go-back-n link-layer retransmissions) and check bits (CRC-16).It is probable that XIO uses STL (which SGI likes to call SGI transistor logic) low-voltage single-ended I/O standard. CrossTown is a version of XIO utilizing PECL for differential I/O standard (like NUMAlink) for longer connections.Higher-level encapsulation differs from NUMAlink (like used to connect HUB chips in Origin-series machines). It is well suited for short memory transactions.[citation needed]XIO uses very delicate compression connectors, which should be handled with extreme care.".
- XIO wikiPageID "906583".
- XIO wikiPageRevisionID "588856569".
- XIO hasPhotoCollection XIO.
- XIO subject Category:Computer_buses.
- XIO type Abstraction100002137.
- XIO type Arrangement105726596.
- XIO type BusTopology105730591.
- XIO type Cognition100023271.
- XIO type ComputerBuses.
- XIO type Configuration105731779.
- XIO type Design105728678.
- XIO type PsychologicalFeature100023100.
- XIO type Structure105726345.
- XIO type Topology105730365.
- XIO comment "XIO is a packet-based, high-performance computer bus employed by the SGI Origin 2000, Octane, Altix, Fuel and Tezro machines. The XIO forms a bus between high-performance system devices and the memory controller.XIO is usually used in a star topology, using a router ASIC called Crossbow (Xbow) to connect up to eight fully symmetrical devices in a system (one of them is usually the memory controller / CPU bridge, called HEART in Octane or Hub in Origin).".
- XIO label "XIO".
- XIO sameAs m.03nql3.
- XIO sameAs Q8042210.
- XIO sameAs Q8042210.
- XIO sameAs XIO.
- XIO wasDerivedFrom XIO?oldid=588856569.
- XIO isPrimaryTopicOf XIO.