Description
The logic in Flamingo- and Sandpiper-based systems are contained on two modules (printed circuit boards), the CPU module and the I/O module, with the CPU module being the largest board. The two modules are connected via a 210-pin connector. The logic in Pelican-based systems are contained the CPU module and system module. The CPU module is a daughterboard that plugs into the system module and contains the CPU and the B-cache (L2 cache).
The architecture of the Flamingo- and Sandpiper-based systems is based around a crossbar switch implemented by an ADDR (Address) ASIC, four SLICE (data slice) ASICs and a TC (TURBOchannel) ASIC. These ASICs connect the various different width buses used in the system, allowing data to be transferred to the different subsystems. PALs were used to implement the control logic. The cache, memory and TURBOchannel controllers, as well as other control logic, is entirely implemented by PALs. Pelican-based systems have an entirely different architecture from the other systems, similar to that of late-model Personal DECstations that they are based on, with a traditional workstation architecture with buses and buffers.
Read more about this topic: DEC 3000 AXP
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