Samsung AlphaPC 164BX, Техническое справочное руководство

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Introduction to the AlphaPC 164UX Motherboard
1–3
System Components and Features
1.1.1 Digital Semiconductor 21174 Core Logic Chip
The Alpha 21164 microprocessor is supported by the 21174 core logic chip, which
provides an interface between three units—memory, the PCI bus, and the 21164.
This core logic chip is the interface between the 21164 microprocessor, main mem-
ory (addressing and control), and the PCI bus.
Five Data switches provide the memory interface data path.
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 three
banks of dual inline memory modules (DIMMs). Single- or double-sided DIMMs
may be used. Each DIMM is 72 bits wide, with 64 data bits and 8 check bits, with
100 MHz or faster speed. Two DIMMs provide 32Mb to 512MB of memory, while
six DIMMs provide up to 1536MB. Table 1–1 lists the DIMM sizes tested
Table 1–1 AlphaPC 164UX SDRAM Memory Configurations
(Sheet 1 of 3)
Total
Memory
Bank 0 Bank 1 Bank 2
U3 U4 U5 U6 U7 U8
32MB 16MB 16MB
64MB 16MB 16MB 16MB 16MB
32MB 32MB
96MB 16MB 16MB 16MB 16MB 16MB 16MB
32MB 32MB 16MB 16MB
128MB 32MB 32MB 16MB 16MB 16MB 16MB
32MB 32MB 32MB 32MB
64MB 64MB
160MB 32MB 32MB 32MB 32MB 16MB 16MB
64MB 64MB 16MB 16MB
192MB 32MB 32MB 32MB 32MB 32MB 32MB
64MB 64MB 16MB 16MB