Specifications

17 January 1997 – Subject to Change
Functional Description 4–3
Digital Semiconductor 21172 Core Logic Chipset
4.2 Digital Semiconductor 21172 Core Logic Chipset
The 21172 core logic chipset provides a cost-competitive solution for designers
using the 21164 microprocessor to develop uniprocessor systems. The chipset
provides a 128-bit or 256-bit memory interface and a PCI I/O interface, and includes
the following two gate array types:
•
One Digital Semiconductor 21172-CA CIA chip packaged in a 388-pin plastic
ball grid array (PBGA)
•
Four Digital Semiconductor 21172-BA DSW chips, each packaged in a 208-pin
plastic quad flat pack (PQFP)
Figure 4–2 shows the AlphaPC 164 implementation of the 21172 core logic chipset.