System Board ASICs
Sun Confidential: Internal Only
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Sun Fire 3800 - 6800 Quick Reference Guide
SunService Sun Microsystems, Inc. All Rights Reserved. Enterprise Services
System Board ASICs
The system board CPUs and memory are configured in pairs, (two pairs
per system board maximum) interconnected with a dual cheetah data
switch (DCDS). The DCDS provides a data path between the CPUs and
the L1 Sun Fireplane switch.
The system board L1 (level 1) Sun Fireplane switching logic consists of an
address repeater (AR) and 4 x data switch (DX) ASICs.
Each system board contains a system data controller (SDC). The SDC has
two functions; it multiplexes the console bus connections to allow all
system boards and Sun Fireplane switch boards to communicate to each
of the system controllers.
It is also the brains of the operation behind the data crossbar. If a data
packet is considered as a train, the DXs are like the tracks and the SDC is
like the signal box; the SDC routes the data.