This manual is intended for use by Digital customer
service engineers and self-maintenance customers
installing MS65A memories.
digital equipment corporation
maynard, massachusetts
First Printing, December 1990
The information in this document is subject to change without notice and should not be
construed as a commitment by Digital Equipment Corporation.
Digital Equipment Corporation assumes no responsibility for any errors that may appear in
this document.
The software, if any, described in this document is furnished under a license and may be used
or copied only in accordance with the terms of such license. No responsibility is assumed
for the use or reliability of software or equipment that is not supplied by Digital Equipment
Corporation or its affiliated companies.
The following are trademarks of Digital Equipment Corporation:
DECPDPVAXcluster
DEC LANcontrollerULTRIXVAXELN
DECnetUNIBUSVMS
DECUSVAXXMI
DWMVAVAXBI
FCC NOTICE: The equipment described in this manual generates, uses, and may emit
radio frequency energy. The equipment has been type tested and found to comply with the
limits for a Class A computing device pursuant to Subpart J of Part 15 of FCC Rules, which
are designed to provide reasonable protection against such radio frequency interference when
operated in a commercial environment. Operation of this equipment in a residential area
may cause interference, in which case the user at his own expense may be required to take
measures to correct the interference.
This manual is written for Digital customer service engineers and for selfmaintenance customers installing MS65A memories in VAX 6000 systems.
MS65A is the memory required by the VAX 6000 Model 500.MS65A
memories can be installed in VAX 6000 Model 200, 300, and 400 systems.
Document Structure
This manual uses a structured documentation design. There are many
topics, organized into small sections for efficient reference.Each topic
begins with an abstract. You can quickly gain a comprehensive overview
by reading only the abstracts. Next is an illustration or example, which
also provides quick reference. Last in the structure is descriptive text.
This manual has three chapters and two appendixes, as follows:
•Chapter 1, Overview, provides MS65A configuration rules and
information on ROM upgrades.
•Chapter 2, Unpacking and Installation, gives instructions on how
to unpack and install the MS65A.
•Chapter 3, Power-Up and Self-Test, describes the VAX 6000 self-test
with a focus on the MS65A memory modules.
•Appendix A, ROM Kit Order Numbers, shows the ROM kit numbers
for VAX 6000 systems.
•Appendix B, Interleaving, gives an overview of the interleaving
process for the MS65A.
v
VAX 6000 Series Documents
There are two sets of documentation: manuals that apply to all VAX 6000
series systems and manuals that are specific to one VAX 6000 model.
Table 1 lists the manuals in the VAX 6000 series documentation set.
Table 1:VAX 6000 Series Documentation
TitleOrder Number
Operation
VAX 6000 Series Owner ’s ManualEK–600EA–OM
VAX 6000 Series Vector Processor Owner’s ManualEK–60VAA–OM
TU81/TA81 and TU/81 PLUS Subsystem User’s GuideEK–TUA81–UG
viii
Table 3 (Cont.): Associated Documents
TitleOrder Number
VAX Manuals
VAX Architecture Reference ManualEY–3459E–DP
VAX Systems Hardware Handbook — VAXBI SystemsEB–31692–46
VAX Vector Processing HandbookEC–H0739–46
ix
x
Chapter 1
Overview
MS65A memory modules are used in all VAX 6000 series systems. Model
500 systems require the MS65A. Earlier model systems can use the MS65A
along with the MS62A memory modules. MS65A memory modules used in
Model 200, 300, or 400 systems provide higher density memory modules
with a capacity of up to 128 Mbytes per module.
VAX 6000MS65AMS62A
Model 500YesNoNo
Models 200, 300, 400YesYesYes
This chapter describes the use of MS65A memory modules.Sections
include:
•MS65A Description
•Required ROM Upgrades
•MS65A Configurations
Both MS65A
and MS62A
Overview 1–1
1.1 MS65A Description
The MS65A memory module is a metal-oxide semiconductor
(MOS), dynamic random access memory (DRAM), which
provides up to 128 Mbytes of data storage. The memory
module is designed for use with the VAX 6000 through the
XMI bus.
Figure 1–1:MS65A Module
GREEN
POWER
LED
YELLOW
SELF-TEST
LED
SMALL
RED
LED
CONTROL/ADDRESS
DRAM
BUFFERS
BLOCK STATE
BUFFER
DRAMS
DRAMSDRAMS
DATA
MUXs
DATA
MUXs
EEPROM
MEMORY CONTROL
GATE ARRAY
ZIF
CONNECTOR
SEGMENTS
msb-0454A-90
XMI
CORNER
1–2 VAX 6000: Installing MS65A Memories
The MS65A memory module has the following features:
•The memory module contains MOS dynamic RAM (DRAM) arrays; a
CMOS memory control gate array that contains error correction code
(ECC) logic and control logic; an EEPROM storage element; and an
XMI interface known as the XMI Corner.
•Storage arrays are made up of two or four banks, either 155 or 299
DRAMs.
•ECC logic detects single-bit and double-bit errors and corrects single-bit
errors on 64-bit words.
•Memory self-test checks all RAMs, the data path, and control logic on
power-up.
•Quadwords, octawords, and hexwords can be read from or written to
memory.
•Memory is configured by the console program for 2-, 4-, 8-way or no
interleaving.
NOTE: The MS65A memory is required by VAX 6000 Model 500 and later
models since it implements the write-back cache protocol. However, it can
be used in Model 200, 300, and 400 systems.
Overview 1–3
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