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Introduction 1–3
System Components and Features
1.1.1 21174 Core Logic Chip
The Alpha 21164PC microprocessor is supported by the 21174 core logic chip,
which provides an interface between three units—memory, the PCI bus, and the
21164PC (along with flash ROM). This core logic chip is the interface between the
21164PC microprocessor, main memory (addressing and control), and the PCI bus.
Quick switches provide the memory interface data path isolation.
The 21174 includes the majority of functions necessary to develop a high-perfor-
mance PC or workstation, requiring minimum discrete logic on the module. It pro-
vides flexible and generic functions to allow its use in a wide range of systems.
1.1.2 Memory Subsystem
The synchronous dynamic random-access memory (SDRAM) is contained in two
banks of dual inline memory modules (DIMMs). Single- or double-sided DIMMs
may be used. Two DIMMs provide 32Mb to 256MB of memory, while four DIMMs
provide up to 512MB. Table 1–1 lists the DIMM sizes tested and the corresponding
main memory size for 128-bit arrays.
Note: Each DIMM can be 72 bits or 64 bits wide, with 100 MHz or faster
speed.
Table 1–1 AlphaPC 164SX SDRAM Memory Configurations
(Sheet 1 of 2)
Bank 0
1
Bank 1
1
Total Memory J7 J8 J9 J10
32MB 2Mb × 72 2Mb × 72 ——
64MB 2Mb
× 72 2Mb × 72 2Mb × 72 2Mb × 72
4Mb
× 72 4Mb × 72 ——
96MB 4Mb
× 72 4Mb × 72 2Mb × 72 2Mb × 72
128MB 4Mb
× 72 4Mb × 72 4Mb × 72 4Mb × 72
8Mb
× 72 8Mb × 72 ——
160MB 8Mb
× 72 8Mb × 72 2Mb × 72 2Mb × 72