Compaq AlphaServer DS20 Service Manual download pdf (Page 75)

Error Registers 3-5

3.3

Dcache Status Register – DC_STAT

The Dcache Status Register (DC_STAT) is a read-write register. If a Dcache tag

parity error or data ECC error occurs, information about the error is latched in

this register. The register is read only by PALcode and is an element in the CPU

or System Uncorrectable Machine Check Error Logout frame.

PK1416-99

SEO

ECC_ERR_LD

ECC_ERR_ST

TPERR_P1

TPERR_P0

432

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 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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Compaq AlphaServer DS20 Service Manual Page 75

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