Compaq Computer Corporation AlphaPC 164SX Motherboard Technical Reference Manual Order Number: EC-R57EB-TE Revision/Update Information: This is a revised document…

Contents: Introduction: System Components and Features, 21174 Core Logic Chip, Memory Subsystem, L2 Bcache Subsystem Overview, PCI Interface Overview, ISA Interface Overview, Miscellaneous Logic, Software Support, AlphaBIOS Windows NT Firmware, Alpha SRM Console Firmware, Motherboard Software Developer’s Kit (SDK), Hardware Design Support. System Configuration and Connectors : AlphaPC 164SX Configuration Switches, CPU Speed Selection (CF[6:4]), Bcache Size Switches (CF0 and CF1), Password Bypass (CF2), Fail-Safe Booter (CF7), Mini-Debugger (CF3).
This chapter provides an overview of the AlphaPC 164SX motherboard, including its components, features, and uses. The motherboard is a module for computing systems based on the 21174 core logic chip. The AlphaPC 164SX provides a single-board hardware and software development platform for the design, integration, and analysis of supporting logic and subsystems. The board also provides a platform for PCI I/O device hardware and software devel- opment. System Components and Features. The AlphaPC 164SX is implemented in industry-standard parts and uses an Alpha 21164PC microprocessor running at 400 or 533 MHz. Figure 1-1 shows the board’s functional components. 121174 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-performance PC or workstation, requiring minimum discrete logic on the module. It provides flexible and generic functions to allow its use in a wide range of systems. 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…

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