Compaq AlphaServer DS20 Service Manual download pdf (Page 28)

1-18 AlphaServer DS20 Service Manual

1.8.1 Cross-Bar Switch and System Components

The cross-bar switch chipset consists of a single control chip, the C-chip, and

eight data chips, the D-chips. Into and out of the D-chips are two system buses to

CPUs, two PAD buses to PCI chips, and two memory data buses that connect to

up to four memory banks.

Figure 1-10 Cross-Bar Switch Data Block Diagram

PK1489-9

TIG

PA L

TIG Bus

CAP Bus

Interrupts

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 181 182

AlphaServer DS20 1
Contents 3
Chapter 3 Error Registers 4
Appendix C Firmware Update 5
Examples 5
Intended Audience 9
Document Structure 9
Documentation Titles 10
Information on the Internet 10
System Overview 11
Chapter 1 11
System Enclosure 12
PKW-0501-97 14
System Consoles 16
System Architecture 18
CPU Types 20
Figure 1-6 Memory Placement 22
PK1488-98 24
Example 1–1 Show Memory 25
Interrupts 28
Table 1-1 PCI Slot Numbering 31
PK1410-99 32
Table 1-2 Switchpack 2 33
Table 1-3 Switchpack 3 33
Server Feature Module 34
1.9.1 Power Control Logic 36
PK1493-98 38
Power Supply 40
Power Up/Down Sequence 42
Maintenance Bus (I 46
Error State 47
StorageWorks Drives 48
System Overview 1-39 49
Chapter 2 51
Troubleshooting 51
Testing an Entire System 59
Other Useful Console Commands 61
Troubleshooting with LEDs 62
Compaq Analyze 64
Continued on next page 67
Table 2-2 Types of Errors 69
Releasing Secure Mode 70
Chapter 3 71
Error Registers 71
Ibox Status Register - I_STAT 72
MM_STAT 73
PK1416-99 75
Cbox Read Register 77
Miscellaneous Register (MISC) 79
PK1418-99 82
Pchip Error Register (PERROR) 83
Failure Register 86
Table 3-8 Failure Register 87
Function Register 88
Table 3-9 Function Register 89
Chapter 4 91
Removal and Replacement 91
FRU List 92
System Access 96
CPU Removal and Replacement 98
Figure 4-4 Removing Memory 100
System Board 102
Slot Cover 104
Option Card 104
Replacement 106
PK1404-99 110
PK1481 - 9 114
Module Guides 116
PKW0519A-97 118
➊ in Figure 119
Replacement 120
Figure 4-15 Removing CD-ROM 122
PK1401-98 124
PKW0501B-97 126
PK1412-99 130
Appendix A 133
Halts, Console Commands, and 133
Environment Variables 133
Halt Button Functions 134
Using the Halt Button 135
Halt Assertion 136
Appendix B 145
Managing the System Remotely 145
RCM Overview 146
First-Time Setup 147
➊ in Example 148
RCM Commands 149
Using the RCM Switchpack 154
Troubleshooting Guide 157
Appendix C 159
Firmware Update 159
PK1461-98 160
Diskettes 166
Update 168
(Continued) 170
Internal Floppy Disk 171
C.1.5 LFU Commands 176

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