Emulex MD01 User manual

®
EMULEX
3545 Harbor Boulevard
MDOI
(MEDALIST)
DISK CONTROLLER
TECHNICAL MARUAL
Costa Mesa, California 92626
(714)
662-5600 TWX 910-595-2521
MD0151001 Rev 03.
July, 1984

WARNING
This equipment generates, uses and can radiate radio frequency
energy, and if not installed and used in accordance with the
technical manual, may cause interference to radio communications.
It has been tested and found to comply with the limits for a
Class B computing device pursuant to Subpart J of Part 15 of the
Federal Communications Commission (FCC) Rules, which are designed
to provide reasonable protection against such interference when
operating in a residential installation. However, there is no
guarantee that interference will not occur in a particular
installation.
Copyright (C) 1984 Emulex Corporation
The information in this manual is for information purposes and is
subject to change without notice.
Emulex Corporation assumes no responsibility for any erro'rs which may
appear in the manual.
Printed in U.S.A.

TABLE OF CONTENTS
Section
ONE GENERAL DESCRIPTION
1.1
1.1.1
1.1.2
1.2
1.3
1.3.1
1.4
1.4.1
1.4.2
1.4.3
1.4.4
1.4.5
INTRODU CT ION • II •••• 0 II ••• 0 0 •••• 0 ••• 0 • 0 •• 0 0 0 •• 0 •••••••• 0
RELATED DOCUMENTS • 0 0 QQ ••• 0 " ••••••••• 0 ••••••• 0 ••••••
TECHNICAL MANUAL CONVENTIONS .•••••••.••••.•..•••.•.
PHYS I CAL DESCRIPTION •••••••••••••••••••.•...•.•.•...•
FUNCTIONAL OVERVIEW •• 0 0 0" •••• 0 0 0 ••• 0 0 ••• 0 • II ••••• 0 • 0 0 •
FEA T{J RES 0 0 0 0 0 • 0 0 II •• 0 •• II 0 •• 0 •• 0 • 0 It • 0 • 0 •• 0 0 ••••• 0 •• 0 0
CO M PA TIBILI TY CI... 0 • • 0 • 0 • • 0 • • • • • • • • • • • • • • • • • • • • 0 • • • • 0 •
SCSI BUS HARDWARE COMPATIBILITy .•.••••..•.••.••.•..
SCSI BUS PROTOCOL AND COMMAND COMPATIBILITY ••••••.•
SCSI COMMAND SET •• 00 •••• 0 ••••••••••••••••••••••••••
DEVIATIONS FROM SCSI STANDARD •.••.•••••.•.•••••....
ST506 DISK DRIVE INTERFACE COMPATIBILITY •••••••..•.
TWO MDOI CONTROLLER SPECIFICATIONS
2.1
2.2
2.3
OVERV lEW 0 0 •• 0 0 0 •••• 0 0 ••••••• 0 • 0 ••••••••• II ••••••••••••
GENERAL AND ELECTRICAL SPECIFICATIONS ••••.•.••..••.•.
PHYS I CAL SPECIFI CATIONS ••••••••••••••..•••••••.••••.•
THREE INSTALLATION
3.1
3.1.1
3.2
3.3
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.3.7
3.3.8
3.3.9
3.4
3.5
aVE RV lEW 0 0 0 0 • 0 0 0 0 0 0 0 0 • • • • • • • o· 0 0 • • 0 0 0 0 0 0 0 0 • • 0 • • • • • 0 0 • 0
DIP SW ITCH TY PE S 0 0 0 0 •• 0 0 0 0 0 • 0 ••• 0 •••• 0 •••••••••••••
INS PE CT I0 ~l 0 \) 0 • 0 0 0 0 0 0 0 0 0 • • 0 • 0 0 • • " • • 0 Ii • • • • 0 0 • • • 0 • • • 0 • • •
MDOI SCSI CONTROLLER SETUP •••••.••••••••••••••.•.••••
ENCODED DR IVE TY PE •••••••••••••••••••••••••••••••••
S ECTO R SI ZE • 0 0 0 0 0 0 0 " • 0 0 0 0 0 •• 0 0 • • • • 0 • 0 • • • 0 ••••••••••
cP{J SPEED 0 0 0 ••• 0 a 0 •• 0 • 0 ••• " ••• 0 •••••• 0 • • • • • • 0 • • • •••
SCSI DEVICE ADDRESS SELECTION ••.•••••••••••••••••••
EPROM SELECTION 00 ••• 0. 0 ••••••• ~ •••••••••••• 0 • o ••• 0.
NUMBER OF SPARE SECTORS PER TRACK .••••••.••••••••••
BUFFERED STEP OPTION ••..•••••••••••••••••••••......
DRIVE CONFIGURATION SOURCE .•••.•••••••.•••..•••••.•
SCS I TERMINATION OPTION •••.••••.•••.••.•••.••.•.•..
MDOI SCSI CONTROLLER INSTALLATION ..•••••••••.••••.•••
FCC COMPL IAN'CE 0" 0 0 ••• 0 •• 0 0 • 0 0 •• 0 •• 0 • 0 •••••••• 0 •• 0 •• 0 •
FOUR TROUBLESHOOTING
4.1
4 .1.1
4.2
4.3
OVERV lEW ••• 0 • 0 0 0 0 0 • 0 0 0 • 0 0 0 •••• 0 ••• 0 • 0 •••••• 0 ••••• 0 • 0 •
SERV ICE . 0 0 0 I» 0 • 0 ........................... 0 •••••••• 0 •
POWER-UP SELF-TEST ••• 0 0 • o. 0 •• 0 •• If •••••••••••• 0 •• If • 0 ••
ON-LINE DIAGNOSTIC SUBCOMMANDS .....•.••••.•.•.•••.•..
Page
1-1
1-2
1-2
1-3
1-4
1-5
1-5
1-5
1-6
1-6
1-7
1-7
2-1
2-1
2-3
3-1
3-1
3-2
3-2
3-5
3-7
3-7
3-4
3-8
3-9
3-9
3-9
3-10
3-11
3-14
4-1
4-1
4-2
4-3
Table of Contents iii

FIVE FUNCTIONAL DESCRIPTION
5.1
5.2
5.2.1
5.2.2
5.2.3
5.3
5.3.1
5.3.2
OVERVIEW
......................
MD01 CONTROLLER ARCHITECTURE
8031 MICROPROCESSOR •••••
DISK FORMATTER ••••••••••
BUFFER CONTROLLER ...
............ ....
.............
.............
.
.....
••
DISK OPERATIONS ••••••••
·........ ............
TRACK FORMAT OPERATIONS ••••
BAD SECTOR FORMAT OPERATIONS
·.......... .
.
·...............
SIX INTERFACES
6.1
6.2
6.2 •. 1
6.2.1.1
6.2.1.2
6.2.2
6.2.2.1
6.2.3
6.2.3.1
j.2.3.2
6.3
6.4
SEVEN
7.1
7.2
7.3
OVERVIEW
.............................................
SCSI BUS INTERFACE
...................................
SCSI BUS INTERFACE PHYSICAL DESCRIPTION
Cable Requirements •••••••••••••••••
Shielded Cable Requirements •••••••• ......
SCSI INTERFACE ELECTRICAL DESCRIPTION ••••••••••••••
Terminator Power (Optional) ••
SCSI BUS SIGNALS AND TIMING ••••••
......
·.........
SCSI Bus Signals
SCSI Bus Timings
.................................
.................................
MD01 CONTROLLER USER'S PANEL CONNECTION ••••••••••••••
ST506 DISK DRIVE INTERFACE ...........................
SCSI BUS PROTOCOL
OVERVIEW •••••••••••• ...................
SCSI BUS DESCRIPTION
SCS I BUS PHASES ......................................
ARBITRATION PHASE ••••••••••••••••• ... .......
SELECTION AND RESELECTION PHASES •••••••••••••••••••
INFORMATION TRANSFER PHASES
• • • ·
...
·.
Command Phase ••••••••••••••• • •••••••••••••
Da ta Phase ••.•.•••.•••••••.•••••••••••• • •••••••
status Phase •.••••.••••••••••••••••••••• • ••••
Status Byte Format •••••••••••••••••••••••••••
Me ssa ge Phase .••••••••••••• • • • • • • • • • • • • • ••••
7.3.1
7.3.2
7.3.3
7.3.3.1
7.3.3.2
7.3.3.3
7.3.3.3.1
7.3.3.4
7.4 SCSI BUS PHASE SEQUENCING ••••••••••••••••••••••••••••
7.5 SCSI MEMORY ADDRESS POINTERS ••••••••••••
· ...
. ...
7.6
7.7
7.7.1
7.7.2
SCSI COMMAND QUEUING ••••••••
SCSI BUS CONDITIONS
RESET
ATTENTION
.. ·
..
·....
iv Table of Contents
.....................
........ ·.......
..
5-1
5-1
5-1
5-3
5-3
5-3
5-3
5-5
6-1
6-1
6-1
6-1
6-2
6-2
6-2
6-4
6-4
6-7
6-12
6-13
7-1
7-1
7-4
7-4
7-5
7-6
7-6
7-7
7-8
7-8
7-9
7-12
7-13
7-14
7-15
7-15
7-15

EIGHT MDOI SCSI COMMAND SET
8.1 OVERVIEW ••••••••••••••••••••••••••••••••••• 0 •••••••••
8.2
8.3
8.3.1
8.3.1.1
SCSI COMMAND DESCRIPTOR BLOCK STRUCTURE ••••••••••••••
SCSI GROUP CODE 0 COMMAND DESCRIPTIONS •••••••••••••••
8.3.1.2
8.3.1.3
8.3.4.1
8.3.1.4.1
8.3.1.4.2
8.3.1.4.3
8.3.2
8.3.2.1
8.3.3
8.3.3.1
8.3.4
8.3.4.1
8.3.4.2
8.3.5
8.3.5.1
8.3.5.2
8.3.5.3
8.3.6
8.3.7
8.3.7.1
8.3.8
8.3.9
8.3.10
8.3.10.1
8.3.10.2
8.3.10.3
8.3.11
8.3.12
8.3.13
8.3.14
8.3.14.1
8.3.14.2
8.3.14.3
8.3.14.3.1
8.3.14.4
8.3.14.5
8.3.15
8.3.16
COpy •••••••••••••••••••••••••••••••••••••••••• D ••••
Random-to-Sequentia1 Access and Sequential-to-
Random Access Copy Operations ••••••••••••••••••
Random-to-Random Access Copy Operations •••••••••
Sequentia1-to-Sequentia1 Access Copy
Operations .oo ••••••••••••••••••••••••••••••••• q
Error and Other Conditions During a Copy
Oper a ti on •••••••••••••••••••••••• 18 ••••••••••• " •
End-of-Media Condition ••••••••••••••••••••••••
File Mark Condition ••••••••••••••••••••.••••••
Incomplete Condition •••••••••••••••••••.••••••
FOR!JIAT UNIT •••••••••••••••••••••••••••••••••••••••
Format Unit Data Format •••••••••••••••••••••••••
INQUIRY ••••• a •••••••••••••••••••• 0 ••••••••••• 0 ••••
Inquiry Data Format •••••••••••••••••••••••••••••
MODE SELECT • .0. • • • • • • • • • • • • • • • • a 0 • • • • • • • • • • • • • • • • 0
Mode Select Parameter List for ESDI Disk
Drives ... 0 •••••••••••••••••••••••••••••••••••••
Mode Select Parameter List for ST506 Disk
Drives ........................................ .
MODE SENSE • 0 ••••••••• 0 •• 0 •••••• 0 0 ••••• 0 a ••••••••••
Mode
Mode
Mode
Sense
Sense
Sense
Data
Data
Data
Format
Format
Format
• • • • • 0 0 • • • • • • 0 • • • • • • • • • • • •
for ESDI Disk Drives •••••
for ST506 Disk Drives ••••
READ •••••••••••••• 0 ............................. 0 ••
RE-ASSIGN BLOCK ••••••••••••••••••••••••••• ,. ....... .
Re-assign Block Data Format •••••••••••••••••••••
RECEIVE DIAGNOSTIC ••••••••••••••••••••••••••••••••
REL EAS E UN IT. • • • • • • • • • • • • • • • • • • • • • • • • • 0 • • • • • • • • • 0 •
REQUEST SENSE •••• 0 • 0 0 •••••••••••••••••••••••••••••
Standard Sense Byte Format ••••••••••••••••••••••
Extended Sense Byte Format •••••••••••••.••••••••
Vendor-Unique Extended Sense Byte Format ••••••••
RESERVE UNIT ••••••••••••••••••••••••••••••••••••••
REZ ERO UNIT ••••••••••••••••••••.••••••••••••••••••
SEEK ••••••••••••••••••••• 0 •••••••••••• 0 •• " •••• 0 •••
SEND DIAG NOSTIC •••••••••••••••••••••••••••••••••••
PERFORM DRIVE DIAGNOSTIC ••••••••••••••••••••••••
READ BAD SECTOR FILE ••••••••..••••••••••••••••••
READ DISK PARTITION •••••••••••••••••••••••••••••
READ DISK PARTITION Data Format •••••••••••••.•
READ LONG •••••••••• 0 •••••••• 0 ••••••••••••• 0 •••• 0
WRITE LONG •••••••••••••••••••••••••••• 0 •••••••••
TEST UNIT READY • 0 •••• 0 ••• 0 •••• 0 •••••• 0 ••••••••••••
WRI TE ••••••••• 0 ••• 0 •••••••••••••••••••••••••••••••
8.4
SCSI GROUP CODE 1 COMMAND DESCRIPTIONS ••••••••••••••
8.4.1
8.4.1.1
READ CAPACITY •••••••••••••••••••••••••••••••••••••
Read Capacity Data Format •••••••••••••••••••••••
Table of Contents
8-1
8-1
8-2
8-4
8-6
8-8
8-10
8-12
8-12
8-13
8-13·
8-15
8-18
8-19
8-21
8-24
8-25
8-28
8-32
8-33
8-35
8-38
8-42
8-45
8-47
8-49
8-51
8-53
8-54
8-60
8-65
8-67
8-69
8-71
8-73
8-75
8-76
8-77
8-78
8-79
8-80
8-82
8-84
8-86
8-88
8-90
v

8.4.2 READ
(EXTENDED) ..........................
·....
8-91
8.4.3
SEARCH
DATA EQUAL
........................
·...
.
.... 8-94
8.4.3.1 Search
Data
Commands
Parameter List
....
· ...
.. 8-98
8.4.4 SEARCH
DATA HIGH
·...............
·....
..
........... 8-101
8.4.5 SEARCH
DATA
LOW
·............ ·
..
.. 8-105
8.4.6
SEEK
(EXTENDED) ..........
· ........
..... ·....
8-109
8.4.7
VERIFY ..........
·........
· ...... ·......· ......
. ... 8-111
8.4.8
WRITE
(EXTENDED)
·........·......·......
·.....
8-114
8.4.9 WRITE
AND VERIFY
·........
·.............
·..... .
.. 8-116
vi Table of Contents

Table
1-1
2-1
2-2
3-1
3-2
3-3
3-4
3-5
4-1
4-2
6-1
6-2
6-3
6-4
7-1
7-2
8-1
8-2
8-3
8-4
8-5
8-6
8-7
Figure
1-1
1-2
3-1
3-2
3-3
3-4
4-1
5-1
5-2
6-1
6-2
6-3
6-4
LIST OF TABLES
Title
00001 SCSI Command Set ••••••••.••••••••••••••••••••••
General and Electrical Specifications •••••••••••••••
Physical Specifications ••••••.••.•.•••••••••••••••••
DIP Switch Settings, 00001 SCSI Controller .•••..•.•.•
Disk Drive Configuration Table Entries ••••••••••••••
Parameters for Entries in Disk Drive Configuration
Table GOO Q 0 0 0 a 0 0 • 0 000 .0 0 • 0 0 • a 0 •••••• 0 0 •••••• It •••••••
SCSI Device Address Selection Switches •.•••••••••...
Number of Spare Sectors/Track •••••••••••••••••.••.••
LEO Test Code Oescriptions D •••••••••••••••••••••••••
00001 Controller Diagnostic Subcommands ••••.•••••••••
SCSI Bus Signals ••••••••.••••••••••.••••••••••••••••
Pin/Signal Assignments at SCSI Bus Interface •.•••••.
SCS I Bus Timings 0 ••••• 0 •••••••••••••••••••••••••••••
External LEDs Connector Pin Description •••••••••••••
S tat us Co des 0 0 • 0 • 0 0 • 0 0 • 0 0 0 • 0 •• 0 0 • 0 0 0 • 0 ••• 0 0 •••• 0 0 0 ••
00001 SCSI Messages ••••••••••••••••••••••••••••••••••
COpy Command Function Codes •••••.•••••••.•••••••••••
MDOI Controller Format Modes ••••••••••.•••.•••••••..
Spare Sector s/Tr ack Bits ••••••••••••••••••••••••••••
READ Command Error Conditions .••.•••••.•••.•••••••••
Standard Sense Error Classes ••.•.•••••••••••••••••••
Standard Sense Byte Error Codes •••••••.•••.••••••••.
Sense Key Error Codes •••••••••••••••••••••••••.•••.•
LIST OF FIGURES
Title
00001 (Medalist) Disk Controller •••..••••••.••.••••••
Sample SCSI Bus System Configuration ••••.•••••••••••
00001 Switch and Jumper Locations ••••••••••••••••••••
Installing MDOI Controller on Mounting Bracket ••••••
Connecting Disk Drive Data and Control Cables to
00001 Controller ••.••••••••••••••••.••••....•.••••••
Connecting SCSI Bus to 00001 Controller ••••..•.•.•••.
Location of LEDs on MOOI Controller •••.••.•••••.•••.
00001 SCSI Controller Block Diagram •••.•.•...•••..•••
00001 Controller Disk Header Format •..••••••••••..•••
00001 SCSI Disk Controller ••••..••••••..•••.••••.••.•
SCSI Bus Signals Termination •..•..•.••••••••••...•..
SCSI Bus Timing Diagram •••••.•••••..•.•.••..•.•..•.•
Control Pin/Signal Assignments at ST506 Disk
Drive Interface ••••.•••••••.•••.••••.•.•••.•....•.•
6-5 Data Pin/Signal Assignments at Disk Orive
7-1
7-2
8-1
8-2
In t e r face 0........ 0. 0. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sample SCSI Bus Configurations •••••••••••.•.••••••.•
SCSI Bus Phase Sequences ••••••••.•••••••••••••••••••
Sample Group 0 Command Descriptor Block •••••••••.•.•
Sample Group 1 Command Descriptor Block ••••.•.•••••.
Page
1-6
2-1
2-3
3-3
3-6
3-7
3-8
3-9
4-3
4-4
6-5
6-6
6-7
6-12
7-9
7-10
8-6
8-17
8-22
8-43
8-55
8-56
8-62
Page
1-3
1-4
3-4
3-12
3-13
3-13
4-2
5-2
5-4
6-3
6-3
6-9
6-13
6-14
7-3
7-13,
8-3
8-87
Table of Contents vii

EMULEX PRODUCT WARRANTY
CONTROLLER WARRANTY: Emulex warrants for a period of twelve (12)
months from the date of shipment that each Emulex Controller Product
supplied shall be free from defects in material and workmanship.
During this period, if the customer experiences difficulties with an
Emulex controller and is unable to resolve the problem via the phone
with Emulex Technical Support, a Return Authorization will be issued.
Following receipt of a Return Authorization, the customer is respon-
sible for returning the product to Emulex, freight prepaid. Emulex,
upon
verification of warranty will, at its option, repair or replace
the controller in question, and return to the customer freight
prepaid.
CABLE WARRANTY: All Emulex provided cables, not included as part of
a subsystem, are warranted for ninety (90) days from the time of
shipment. Questionable cables should be returned to Emulex, freight
prepaid, where they will be repaired or replaced by Emulex at its
option and returned to the customer freight prepaid.
The above warranties shall not apply to expendable components such as
fuses, bulbs, and the like, nor to connectors and other items not a
part of the basic product. Emulex shall have no obligation to make
repairs or to cause replacement required through normal wear and tear
or necessitated in whole or in part by catastrophe, fault or negli-
gence of the user, improper or unauthorized use of the Product, or
use of the Product in such a manner for which it was not designed, or
by causes external to the Product, such as but not limited to, power
failure or air conditioning. Emulex's sole obligation hereunder
shall be to repair or replace items covered in the above warranties.
Purchaser shall provide for removal of the defective Product, ship-
ping charges for return to Emulex and installation of its
ieplacement.
RETURNED MATERIAL: Warranty claims must be received by Emulex within
the applicable warranty period. A replaced product, or part thereof,
shall become the property of Emulex and shall be returned to Emulex
at Purchaser's expense. All returned material must be accompanied by
a
RETURN AUTHORIZATION number assigned by Emulex.
THE EXPRESSED WARRANTIES SET FORTH IN THIS AGREEMENT ARE IN LIEU OF
ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WITHOUT LIMITA-
TION, ANY WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, AND ALL OTHER WARRANTIES ARE HEREBY DISCLAIMED AND EXCLUDED
BY EMULEX. THE STATED EXPRESS WARRANTIES ARE IN LIEU OF ALL OBLIGA-
TIONS OR LIABILITIES ON THE PART OF EMULEX FOR DAMAGES, INCLUDING BUT
NOT LIMITED TO SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES ARISING
OUT OF, OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THE PRODUCT.
viii Warranty

section 1
GENERAL DESCRIPTION
The MDOI SCSI Disk Controller, called the Medalist, was designed by
Emu~ex Corporation to interface Small Computer System Interface
(SCSI) hosts and controllers to one or two ST506 5 1/4-inch
Winchester disk drives. (The SCSI bus can interface with up to
eight host adapters and/or related microcontroller devices.) This
manual is designed to help you install the MDOI Controller and to
provide information about buffering, signal translation capabili-
ties, and applications. The contents of the eight sections are
described briefly below.
Section I General Description: This section contains an overview
of the MDOI Controller.
Section 2 MDOI Controller Specifications: This section contains
specifications for the major components of the MDOI
Controller.
section 3 Installation: This section contains the information nec-
essary to install the MDOI Controller in your system.
Section 4 Troubleshooting: This section describes diagnostic
procedures that can be used to pinpoint problem areas on
the MDOI Controller.
Section 5 Functional Description: This section describes the
architecture and disk operations of the MDOI Controller.
Section 6 Interfaces: This section describes the SCSI bus and
ST506 disk drive interfaces.
Section 7 SCSI Bus Protocol: This section describes the SCSI bus
protocol, including signals, phases, and timing.
Section 8 MDOI SCSI Command Set: This section describes SCSI
commands and their corresponding Command Descriptor
Blocks which are supported by the MDOI Controller.
General Description 1-1

Introduction
For reference convenience, Section 1 is divided into four
subsections, as listed in the following table:
Subsection Title
1.1 Introduction
1.2 Physical Description
1.3 Functional Overview
1.4 Compatibility
1.1.1 RELATED DOCUMENTS
This manual is designed to be used by system programmers who are
writing operating system drivers and support utilities.
Familiarity with the SCSI standard and the ST506 disk drive
interface specification are assumed.
The SCSI command set for the MDOI Controller is based on the ANSI
X3T9.2/82-2 Rev. 14 (24 April 84) SCSI Specification. As the SCSI
standard is currently changing, this ANSI specification is subject
to change without notice. It is the intent of Emulex to maintain
SCSI compatibility as the standard evolves.
The ST506 interface standard for 5 1/4-inch Winchester disk drives
is described in standard #XXXXXXXXXX.
1.1.2 TECHNICAL MANUAL CONVENTIONS
To avoid possible confusion with other uses of the same words,
throughout this manual we use the following conventions~
• All SCSI commands (such as READ, MODE SELECT, and INQUIRY)
and diagnostic subcommands (such as READ BAD SECTOR FILE and
WRITE LONG) are printed in uppercase boldface.
• All SCSI status and error messages (such as CHECK CONDITION
and DRIVE NOT READY) are printed in uppercase.
• All SCSI bus phases and conditions (such as Arbitration
Phase) and SCSI Command Descriptor Block names (such as
Extended Sense Byte) are printed in initial caps.
• All SCSI command and message codes are given in their hexa-
decimal values.
1-2 General Description

Physical Description
102 PHYSICAL DESCRI~TION
The MDOI Controller, shown in Figure 1-1, is assembled on a single
board (approximately 5 3/4-inches by 8-inches) and is installed
directly on a mounting bracket located in the subsystem that
contains an ST506 5 1/4-inch Winchester disk drive. The MDOI
Controller contains two Emulex custom Very Large Scale Integration
(VLSI) chips; one is a Buffer Controller and one is a Disk
Formatter. It also contains an 8031 microprocessor chip, a 16-
kilobyte Electrically Programmable Read Only Memory (EPROM), and a
l6-kilobyte Random Access Memory (RAM) which provides 10 kilobytes
of data buffering.
Figure 1-1. The MDOI (Medalist) Disk Controller
General Description 1-3

Functional Overview
1.3 FUNCTIONAL OVERVIEW
In combination with an independent host adapter, the SCSI bus
allows a wide variety of computers to interface with the MDOI Con-
troller. Compatible computers include DEC systems that use the Q-
bus and Unibus, IBM Personal Computer systems like the IBM PC/XT,
and Intel Multibus-based computers. Up to eight bus devices, in
any combination of host systems and intelligent controllers, can be
supported by the SCSI bus. The MDOI Controller, in combination
with one or two ST506 5 1/4-inch Winchester disk drives, provides a
low-cost, compact, storage subsystem in a microcomputer
environment.
The MDOI Controller's architecture and supported SCSI features make
it an ideal building block for use by O.E.M.s and system
integrators. The MDOI Controller supports a powerful set of SCSI
commands. By using those commands, an efficient Multi-Initiator
configuration can be constructed with the support of the Disconnect
function. (The Disconnect function allows the MDOI Controller,
when it is performing a time-consuming task, to release the SCSI
bus temporarily and reconnect at a later time when the task is
complete.) The MDOI Controller may be considered a SCSI extended-
bus device because all standard and extended SCSI commands are
used.
Emulex currently offers two additional SCSI bus microcontrollers
that can be used with SCSI bus subsystems: the Titleist and the
Champion. The Titleist Tape Controller interfaces the SCSI bus to
Cipher 540 Cartridge Tape Drives. The Champion Disk Controller
interfaces Enhanced Small Disk Interface (ESDI) 5 1/4-inch disk
drives to the SCSI bus.
In addition to basic stand-alone controller products, Emulex also
offers complete SCSI bus disk and tape packaged subsystems for
microcomputer applications.
A sample configuration of a SCSI system is shown in Figure 1-2.
HOST HOST
CPU ADAPTER
i3 ST506
CII..----"
ESCI
Figure 1-2. Sample SCSI Bus System Configuration
1-4 General Description

Compatibility
1.3.1 FEATURES
The MDOI Controller features are summarized below. More details on
these features are given in subsequent sections.
• SCSI Implementation based on ANSI X3T9.2/ 82-2 Rev 14 (24
April 84) Specification
• Support of standard 5 1/4-inch Winchester Disk Drives with
ST506 interfaces
• Powerful SCSI command set including:
-Common Commands
-Random
Access Device Commands
-COpy Command
-Linked Command Support
• Support of Disconnect/Reconnect Function
• Command Queuing from multiple Initiators
• Hard Reset
• Buffered operation to optimize performances
• Extensive self-test and diagnostic facilities
• Compatible with Emulex's ESDI disk controller and Cipher 540
tape controller
There are two Dual In-Line Package (DIP) switch packs on the MDOl
Controller. Both switch SWI and switch SW2 are eight-pole general
control switches used for configuring various disk parameters. For
configuration details, see Section 3 (Installation).
1.4 COMPATIBILITY
Compatibility of the MDOI Controller with ST506 disk drives and
SCSI host adapter systems and related microcontrollers is described
in the following subsections.
1.4.1 SCSI BUS HARDWARE COMPATIBILITY
A disk drive or tape drive that is connected to the SCSI bus and
that follows the protocol outlined in the ANSI X3T9.2 SCSI
Specification is compatible with the MDOI Controller/ST506 disk
drive unit. A 50-pin male IDC connector, reference designated J2,
on the MDOI Controller plugs directly into the SCSI bus cable.
General Description 1-5

Compatibility
The MDOI Controller supports the SCSI single-ended bus option. The
overall length of the cable that connects the SCSI host adapters
and controllers in a daisy-chained manner can extend to 6 meters.
All SCSI signals in the cable are terminated at each end by
terminating resistors of 220 Ohms to +5 Vdc, and 330 Ohms to
ground. Terminators are optionally installed, and depend on the
physical profile of the SCSI bus (e.g., they would be installed if
the MDOI Controller is used in an environment that includes an
Emulex subsystem as the last device attached to the SCSI bus
cable). The MDOI Controller complies with the FCC limits for a
Class B computing device (see subsection 3.5).
1.4.2 SCSI BUS PROTOCOL AND COMMAND COMPATIBILITY
The MDOI Controller contains an on-board SCSI protocol control-
ler that controls SCSI protocol and the SCSI bus. The MDOI
Controller supports the SCSI arbitration and reselection
capabilities, and data bus parity. The MDOI Controller
supports all standard SCSI commands described in the ANSI
X3T9.2 SCSI specification. For more information on commands
supported by the MDOI Controller, see Section 8.
1.4.3 SCSI COMMAND SET
The hexadecimal codes for the SCSI
Controller are shown in Table 1-1.
are given in Section 8.
commands supported by the MDOI
Detailed command descriptions
Table 1-1. MTOl SCSI Command Set
Group 0 Command Hex Code
Group 0 Command Hex
Code
TEST DRIVE READY
( 00)
REZERO UNIT ( 01)
REQUEST SENSE (03) FORMAT
UNIT (04)
REASSIGN BLOCK
(07) READ
(08)
WRITE ( OA)
SEEK (
OB)
INQUIRY (
12)
MODE SELECT (15 )
RESERVE
UNIT ( 16)
RELEASE UNIT
(17)
COpy
(18) MODE SENSE ( lA)
RECEIVE DIAGNOSTIC
(lC) SEND DIAGNOSTIC (lD)
Group 1 Command Hex Code
Group 1 Command Hex Code
READ CAPACITY 25 SEEK
(EXTENDED) OB
READ (EXTENDED)
28 VERIFY 2F
SEARCH DATA EQUAL
31 WRITE (EXTENDED)
OA
SEARCH DATA HIGH
30 WRITE AND VERIFY 2E
SEARCH DATA LOW
32
1-6 General Description

Compatibility
1.4.4 DEVIATIONS FROM SCSI STANDARD
When the MDOI Controller performs the COpy command, it does not
support Copy operations where both the source and destination
Logical Units (LUNs) are on different controllers; however, it does
support the third-party reservation needed for the Copy operation.
Since the Copy operation may only be used between LUNs with
compatible block sizes, the MDOI Controller supports block sizes of
256 or 512 byte blocks for external devices.
Commands from several Initiators are queued within the MDOI
Controller. These commands may include the RESERVE UNIT command
(see Table 1-1). If a second command is received from the same
Initiator, and is directed towards the same LUN, the MDOI
Controller returns a BUSY completion status.
1.4.5 ST506 DISK DRIVE INTERFACE COMPATIBILITY
The MDOI Controller can be connected to any ST506 5 1/4-inch
Winchester disk drive via a 34-pin IDC connector reference
designated PIon the MDOI Controller, and one or two 20-pin IDC
male connector reference designators J3 and J4 on the MDOI
Controller. The MDOI Controller was designed specifically for use
with ST506 disk drives.
General Description 1-7

BLANK

2.1 OVERVIEW
Section 2
MOOl SCSI CONTROLLER SPECIFICATIONS
This section contains the general, electrical, and physical specif-
ications for the components on the MDOI Controller. A general
des9ription of each component is included under FUNCTIONAL in the
General and Electrical Specifications table. For a detailed
description of the MDOl Controller's function as a whole, see
Section 5, Functional Description. The general, electrical, and
physical specifications for the MDOI Controller are described in
separate subsections as listed in the following table.
Subsection
Title
Overview 2.1
2.2
2.3
General and Electrical Specifications
Physical Specifications
2.2 GENERAL AND ELECTRICAL SPECIFICATIONS
Table 2-1 lists and describes the general and electrical specifica-
tions for the MDOl Controller.
Table 2-1. General and Electrical Specifications
Pafameter Description
FUNCTIONAL
Design
SCSI Bus/Controller
Interface
Disk Drive Interface
continued on next page
High-speed microprocessor-based disk
controller for integration of one or
two ST506 5 1/4-inch Winchester disk
drives to SCSI bus
Standard SCSI bus interface (ANSI
X3T9.2/82-2 specification), via a 50-
pin male IDC connector
ST506 interface for Winchester 5 1/4-
inch disk drives, via a 34-pin IDC
connector and a 20-pin IDC connector
MDOI SCSI Controller Specifications 2-1

General and Electrical Specifications
Table 2-1. General and Electrical Specifications (continued)
Parameter Description
FUNCTIONAL
Subsystem
Configuration
Number of Heads
Soft Sectoring
Data Buffering
Self-Test
Error Detection/
Correction
INDICATORS
Fault/Activity
Display
Option/Configuration
Switches
INTERFACES
One or two non-intelligent 5 1/4-inch
disk drives and controller per
subsystem
Up to 16 read/write heads
256 byte sectors or 512 byte sectors
supported
Full track data buffer (16 kilobytes
[kbytes]; approximately 6 kbytes for
operating system and program, 10
kbytes for data buffering)
Controller automatically executes
power-up self-diagnostics
48-bit ECC corrects II-bit error
bursts. Bad sectors automatically
remapped to spare sectors; bad tracks
automatically remapped to spare
tracks.
Light emitting diodes (LEOs) indicate
detected MODI Controller fa~lt and
read/write activity; MODI Controller
provides signals that can be used to
control off-board LEOs
On-board switch module for burn-in
self-test arid MODI Controller
configuration
Bus Interface Standard SCSI single-ended option uses
approved receivers and drivers
5 1/4-inch Winchester Standard ST506 disk drive interface
Disk Drive Interface
continued on next page
2-2 MDOl SCSI Controller Specifications

Physical Specifications
Table 2-1. General and Electrical Specifications (continued)
Parameter
Description
ELECTRICAL
Power +S Volts direct current
(Vdc) , ±
S%,
1.S Amperes
(A)
nominal
2.3 PHYSICAL SPECIFICATIONS
Table 2-2 lists and describes the phYSical specifications for the
MODI Controller.
Table 2-2. PhYSical Specifications
Parameter Description
Packaging
Single board,
S 1/4-inch
footprint,
S
3/4-
inch by a-inch
Cabling
Single 20-conductor, radial data cable and
daisy chained 34-conductor
control
cable
Mounting Mounts on a mounting bracket contained in
the STS06 S l/4-inch Winchester disk drive
subsystem
MDOl SCSI Controller Specifications 2-3

BLANK