For systems using the Digital ALCOR chipset: 5 chips (4, 64-bit data
slices (Data Switch, DSW) - 208-pin PQFP and 1 control (Control, I/O
Address, CIA) - a 383 pin plastic PGA). It provides a DRAM
controller (256-bit memory bus) and a PCI interface. It also does
all the work required to support an external Bcache and to maintain
memory coherence when a PCI device DMAs into (or out of) memory.