Samsung AlphaPC 164UX Product manual

AlphaPC 164UX/BX Motherboard
Technical Reference Manual
Preliminary

Notice
The information in this publication has been carefully checked and is believed to be entirely accurate at the time of publication.
Samsung assumes no responsibility, however, for possible errors or omissions, or for any consequences resulting from the use
of the information contained herein.
Samsung reserves the right to make changes in its products or product specifications with the intent to improve function or
design at any time and without notice and is not required to update this documentation to reflect such changes.
This publication does not convey to a purchaser of semiconductor devices described herein any license under the patent rights of
Samsung or others.
AlphaPC 164UX/BX Motherboard
Technical Reference Manual
©1998 Samsung Electronics
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by
any means, electric or mechanical, by photocopying, recording, or otherwise, without the prior written consent of Samsung
Electronics.
Samsung and Samsung logo are trademarks of Samsung Electronics Co., Ltd.
Alpha, Digital Semiconductor are trademarks of Digital Equipment Corporation.
FaxBACK and Intel are registered trademarks of Intel Corporation.
GRAFOIL is a registered trademark of Union Carbide Corporation.
Microsoft, MS-DOS, Windows, and Windows 95 are registered trademarks and Windows NT is a trademark of Microsoft
Corporation.
Dallas is a registered trademark of Dallas Semiconductor Corporation.
Q is a registered trademark of Quality Semiconductor,Inc.
SYMBIOS is a registered trademark of Symbios,Inc.
AMD is a registered trademark of Advanced Micro Devices,Inc.
SMC is a registered trademark of Standard Microsystems Corporation.
All other trademarks and registered trademarks are the property of their respective owners.
San #24 Nongseo-ri, Kiheung-eup
Yongin-city, Kyungki-do, Korea
449-900
FAX : [phone]
TEL : [phone]
Printed in the Republic of Korea

iii
Contents
Preface
1 Introduction to the AlphaPC 164UX Motherboard
1.1 System Components and Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
1.1.1 Digital Semiconductor 21174 Core Logic Chip . . . . . . . . . . . . . . . . . . . . . . . 1–3
1.1.2 Memory Subsystem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
1.1.3 L3 Bcache Subsystem Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5
1.1.4 PCI Interface Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
1.1.5 ISA Interface Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
1.1.6 Miscellaneous Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
1.2 Software Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–7
1.2.1 ARCSBIOS Windows NT Firmware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–7
1.3 Hardware Design Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–7
2 System Configuration and Connectors
2.1 AlphaPC 164UX Jumper Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3
2.2 CPU Speed Selection (Option 1,2,3,&4). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
2.3 Bcache Size Jumpers (Option 14,15). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
2.4 Boot Option Jumper (Option 11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
2.5 AlphaPC 164UX Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
2.5.1 PCI Bus Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
2.5.2 ISA Expansion Bus Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8
2.5.3 SDRAM DIMM Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–9
2.5.4 EIDE Drive Bus Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–10
2.5.5 Diskette Drive Bus Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11
2.5.6 Parallel Bus Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11
2.5.7 COM1/COM2 Serial Line Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . 2–12
2.5.8 Keyboard/Mouse Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12
2.5.9 Input Power Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–13

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2.5.10 Narrow SCSI Bus Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–13
2.5.11 Fast and Wide SCSI Bus Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–14
2.5.12 10/100 Mbit Ethernet Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–14
2.5.13 Speaker Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–15
2.5.14 Microprocessor Fan Power Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . 2–15
2.5.15 Pin Power LED Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–15
2.5.16 IDE Drive LED Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16
2.5.17 Reset Switch Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16
2.5.18 Soft Power Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16
2.5.19 SCSI LED Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16
3 Functional Description
3.1 AlphaPC 164UX Bcache Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
3.2 Digital Semiconductor 21174 Core Logic Chip . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
3.2.1 21174 Chip Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
3.2.2 Main Memory Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4
3.2.3 PCI Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4
3.2.4 System-IO (SIO) Chip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6
3.2.5 Ethernet LAN Controller Chip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6
3.2.6 PCI-Ultra SCSI (Fast-20) I/O Processor Chip . . . . . . . . . . . . . . . . . . . . . . . . 3–7
3.2.7 PCI Expansion Slots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8
3.3 ISA Bus Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8
3.3.1 Combination Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–9
3.3.2 XD Bus Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–10
3.3.3 ISA Expansion Slots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–10
3.3.4 ISA I/O Address Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–10
3.4 Flash ROM Address Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–10
3.5 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–11
3.6 System Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–15
3.7 Reset and Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–17
3.8 DC Power Distribution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–18
4 Upgrading the AlphaPC 164UX
4.1 Upgrading SDRAM Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
4.2 Increasing Microprocessor Speed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
4.2.1 Preparatory Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
4.2.2 Required Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
4.2.3 Removing the 21164 Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
4.2.4 Installing the 21164 Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–3

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5 Power and Environmental Requirements
5.1 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
5.2 Environmental Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
5.3 Physical Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2
5.3.1 Board Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2
5.3.2 Board Measurements and Hole Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3
5.3.3 Board Vertical Clearance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4
5.3.4 ATX I/O Shield Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–5
A System Address Space
A.1 Address Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–1
A.2 PCI Address Space. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–6
A.3 21164 Address Space. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–7
A.3.1 System Address Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–10
A.4 21164 Byte/Word PCI Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–12
A.4.1 21164 Size Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–14
A.5 Cacheable Memory Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–15
A.6 PCI Dense Memory Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–15
A.7 PCI Sparse Memory Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–17
A.7.1 Hardware Extension Register (HAE_MEM). . . . . . . . . . . . . . . . . . . . . . . . . . A–18
A.7.2 Memory Access Rules and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–18
A.8 PCI Sparse I/O Space. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–23
A.8.1 Hardware Extension Register (HAE_IO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–23
A.8.2 PCI Sparse I/O Space Access Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . A–23
A.9 PCI Configuration Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–26
A.10 PCI Special/Interrupt Cycles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–31
A.11 Hardware-Specific and Miscellaneous Register Space . . . . . . . . . . . . . . . . . . . . A–31
A.12 PCI to Physical Memory Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–32
A.13 Direct-Mapped Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–37
A.14 Scatter-Gather Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–38
A.15 Scatter-Gather TLB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–40
A.15.1 Scatter-Gather TLB Hit Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–42
A.15.2 Scatter-Gather TLB Miss Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–42
A.16 Suggested Use of a PCI Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–44
A.16.1 Peripheral Component Architecture Compatibility Addressing and Holes. . . A–45
A.16.2 Memory Chip Select Signal mem_cs_l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–45
B Supporting Products
B.1 Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–1
B.2 Thermal Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–3
B.3 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–3

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B.4 Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–4
C Support, Products, and Documentation
Index

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Figures
1–1 AlphaPC 164UX Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
2–1 AlphaPC 164UX Jumper/Connector Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
2–2 AlphaPC 164UX Configuration Jumpers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4
3–1 AlphaPC 164UX L3 Bcache Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
3–2 Main Memory Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
3–3 AlphaPC 164UX PCI Bus Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5
3–4 AlphaPC 164UX ISA Bus Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8
3–5 Interrupt Logic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–12
3–6 AlphaPC 164UX System Clocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–16
3–7 System Reset and Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–17
3–8 AlphaPC 164UX Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–19
4–1 Fan/Heat-Sink Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–4
5–1 Board measurement and Hole Position Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 5–3
5–2 Board Vertical Clearance Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4
5–3 ATX I/O Shield Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–5
A–1 Address Space Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–5
A–2 Memory Remapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–6
A–3 21164 Address Space Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–8
A–4 21164 and DMA Read and Write Transactions. . . . . . . . . . . . . . . . . . . . . . . . . . . A–9
A–5 System Address Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–11
A–6 21174 CSR Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–12
A–7 Byte/Word PCI Space. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–13
A–8 Dense-Space Address Generation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–17
A–9 PCI Memory Sparse-Space Address Generation – Region 1. . . . . . . . . . . . . . . . A–21
A–10 PCI Memory Sparse-Space Address Generation – Region 2. . . . . . . . . . . . . . . . A–22
A–11 PCI Memory Sparse-Space Address Generation – Region 3. . . . . . . . . . . . . . . . A–22
A–12 PCI Sparse I/O Space Address Translation (Region A, Lower 32MB). . . . . . . . . A–25
A–13 PCI Sparse I/O Space Address Translation (Region B, Higher Area) . . . . . . . . . A–25
A–14 PCI Configuration Space Definition (Sparse) . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–27
A–15 PCI Configuration Space Definition (Dense). . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–27
A–16 PCI Bus Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–30
A–17 PCI DMA Addressing Example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–35
A–18 PCI Target Window Compare. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–36
A–19 Scatter-Gather PTE Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–39
A–20 Scatter-Gather Associative TLB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–41
A–21 Scatter-Gather Map Translation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–43
A–22 Default PCI Window Allocation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–44
A–23 mem_cs_l Decode Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–46
A–24 mem_cs_l Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–47

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UXTables
1–1 AlphaPC 164UX SDRAM Memory Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
2–1 AlphaPC 164UX Jumper/Connector List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3
2–2 PCI Bus Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
2–3 ISA Expansion Bus Connector Pinouts (J10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8
2–4 SDRAM DIMM Connector Pinouts (U3 through U8). . . . . . . . . . . . . . . . . . . . . . . . . . . 2–9
2–5 EIDE Drive Bus Connector Pinouts (J24). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–10
2–6 Diskette (Floppy) Drive Bus Connector Pinouts (J33) . . . . . . . . . . . . . . . . . . . . . . . . . 2–11
2–7 Parallel Bus Connector Pinouts (J13). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11
2–8 COM1/COM2 Serial Line Connector Pinouts (J12) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12
2–9 Keyboard/Mouse Connector Pinouts (J25). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12
2–10 Input Power Connector Pinouts (J18). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–13
2–11 Narrow SCSI Bus Connector (J16). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–13
2–12 Fast and Wide SCSI Bus Connector Pinouts(J15)) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–14
2–13 10/100 Mbit Ethernet Connector Pinouts (J34). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–14
2–14 Speaker Connector Pinouts (J23). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–15
2–15 Microprocessor Fan Power Connector Pinouts (J35). . . . . . . . . . . . . . . . . . . . . . . . . . 2–15
2–16 Power LED Connector Pinouts (J31) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–15
2–17 IDE Drive LED Connector Pinouts (J29). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16
2–18 Reset Switch Connector Pinouts (J37). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16
2–19 Soft Power Switch Connector Pinouts (J36). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16
2–20 SCSI LED Connector Pinouts (J17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16
3–1 ISA I/O Address Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–10
3–2 AlphaPC 164UX System Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–13
3–3 ISA Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–14
5–1 Power Supply DC Current Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
5–2 AlphaPC 164UX Motherboard Environmental Requirements. . . . . . . . . . . . . . . . . . . . 5–2
A–1 Physical Address Map (Byte/Word Mode Disabled). . . . . . . . . . . . . . . . . . . . . . . . . . . A–1
A–2 Physical Address Map (Byte/Word Mode Enabled) . . . . . . . . . . . . . . . . . . . . . . . . . . . A–2
A–3 21164 Byte/Word Addressing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–14
A–4 21164 Byte/Word Translation Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–14
A–5 Int4_valid and 21164 Address Relationship . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–19
A–6 PCI Memory Sparse-Space Read/Write Encodings . . . . . . . . . . . . . . . . . . . . . . . . . . . A–20
A–7 PCI Address Mapping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–21
A–8 PCI Sparse I/O Space Read/Write Encodings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–24
A–9 CPU Address to IDSEL Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–28
A–10 PCI Configuration Space Read/Write Encodings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–29
A–11 Hardware and Miscellaneous Address Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–31
A–12 PCI Target Window Mask Register Fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–33
A–13 Direct-Mapped PCI Target Address Translation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–37
A–14 Scatter-Gather Mapped PCI Target Address Translation. . . . . . . . . . . . . . . . . . . . . . . A–39
A–15 PCI Window Power-Up Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–45
B–1 Samsung DIMM Part Number List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–1
B–2 VisionTek DIMM Part Number List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–2
B–3 Viking Components DIMM Part Number List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–2
B–4 QesTec DIMM Part Number List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–2
B–5 Dense-Pac Microsystems DIMM Part Number List. . . . . . . . . . . . . . . . . . . . . . . . . . . . B–3

ix
Preface
Overview
This manual describes the DIGITAL AlphaPC 164UX/BX motherboard, a module
for computing systems based on the Samsung Alpha 21164 microprocessor and the
Digital Semiconductor 21174 core logic chip.
N Difference between AlphaPC 164UX and 164BX
•AlphaPC 164UX motherboard has the Ethernet LAN Controller and Ultra Wide
SCSI Controller which are not on AlphaPC 164BX motherboard.
•The size of AlphaPC 164BX motherboard’s L3 cache is 2MB.
•The size of AlphaPC 164UX motherboard’s L3 cache is 2MB or 4MB.
•Except the above, AlphaPC 164UX motherboard and 164BX motherboard are
the same.
•The following sections are about AlphaPC 164UX motherboard only.
Audience
This manual is intended for system designers and others who use the AlphaPC
164UX motherboard to design or evaluate computer systems based on the Samsung
Alpha 21164 microprocessor and the Digital Semiconductor 21174 core logic chip.
Scope
This manual describes the features, configuration, functional operation, and inter-
faces of the AlphaPC 164UX motherboard. This manual does not include specific
bus specifications (for example, PCI or ISA buses). Additional information is avail-
able in the AlphaPC 164UX schematics, program source files, and the appropriate
vendor and IEEE specifications. See Appendix C for information on how to order
related documentation and obtain additional technical support.

x
Manual Organization
As outlined on the next page, this manual includes the following chapters, appen-
dixes, and an index.
•Chapter 1, Introduction to the AlphaPC 164UX motherboard, is an overview of
the AlphaPC 164UX motherboard, including its components, features, and uses.
•Chapter 2, System Configuration and Connectors, describes the user-environ-
ment configuration, board connectors and functions, and jumper functions. It
also identifies jumper and connector locations.
•Chapter 3, Functional Description, provides a functional description of the
AlphaPC 164UX motherboard, including the 21174 core logic chip, L3 backup
cache (Bcache) and memory subsystems, system interrupts, clock and power
subsystems, and peripheral component interconnect (PCI) and Industry Standard
Architecture (ISA) devices.
•Chapter 4, Configuring the ARCSBIOS for Windows NT, describes the ARCS-
BIOS and gives instruction to begin the installation of Windows NT
•Chapter 5, Upgrading the AlphaPC 164UX, describes how to upgrade the
AlphaPC 164UX motherboard’s DRAM memory and microprocessor speed.
•Chapter 6, Troubleshooting, describes information about trouble shooting hard-
ware and software during AlphaPC 164UX startup.
•Chapter 7, Power and Environmental Requirements, describes the AlphaPC
164UX power and environmental requirements and provides board dimensions.
•Appendix A, System Address Space, describes the mapping of the 40-bit processor
address space into memory and I/O space addresses. It also lists the physical PCI
address spaces and regions, including the 21174 operating registers and PCI/ISA
device registers.
•Appendix B, Supporting Products, lists sources for components and accessories
not included with the AlphaPC 164UX motherboard.
•Appendix C, Support, Products, and Documentation, describes how to obtain
Samsung Alpha information and technical support, and how to order Samsung
Semiconductor products and associated literature.