Fujitsu MAX3073, MAX3036, MAW3300NP, MAW3300NC, MAW3147NP Specifications
...
C141-C011-01EN
MAW3073, MAW3147, MAW3300 NP/NC
SERIES
MAX3036, MAX3073, MAX3147 NP/NC
SERIES
DISK DRIVES
SCSI PHYSICAL INTERFACE SPECIFICATIONS
This Product is designed, developed and manufactured as contemplated for general use, including
without limitation, general office use, personal use and household use, but is not designed,
developed and manufactured as contemplated for use accompanying fatal risks or dangers that,
unless extremely high safety is secured, could lead directly to death, personal injury, severe
physical damage or other loss (hereinafter “High Safety Required Use”), including without
limitation, nuclear power core control, airplane control, air traffic control, mass transport operation
control, life support, weapon launching control. You shall not use this Product without securing the
sufficient safety required for the High Safety Required Use. If you wish to use this Product for
High Safety Required Use, please consult with our sale person in charge before such use
The contents of this manual is subject to change without prior notice.
All Rights Reserved. Copyright 2005 FUJITSU LIMITED
FOR SAFE OPERATION
Handling of This manual
This manual conta ins important information for using this p roduct. Read thoroughly before using
the product . Use this product only after thoroughly reading and understanding especially the
section “Important Alert Items” in this manual. Keep this manual handy, and keep it carefully.
FUJITSU makes every effort to prevent users and bystanders from being injured or from suffering
damage to their property. Use the product according to this manual.
(Proceed to the Copyright Page)
C141-C011 i
Related Standards
Specifications and functions of products covered by this manual comply with the following
standards.
Standard (Text) No. Name Enacting Organization
T10/1365D Rev 10 Working Draft
American National Standard Information
Technology --- SCSI Parallel Interface 4
American National
Standards Institute
(ANSI)
ii C141-C011
REVISION RECORD
Edition
01 July, 2005 Initial release
Date
published
Revised contents
Specification No.: C141-C011
C141-C011 iii
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PREFACE
This manual explains the MAW3073/MAW3147/MAW3300/MAX3036/MAX3073/MAX3147 NP/NC
series 3-1/2" intelligent disk drives each having the built-in SCSI controller.
This manual details the specifications and functions of the Small Computer System Interface (SCSI) to
connect the above listed disk drives to the user system. Also, the manual details various SCSI command
specifications and the command processing functions, and provides the information required to creation of
host system software. This manual is i nt ended to be use d by the users who have the basi c knowledge of
computer system operations.
The following lists the manual configuration and the contents of each chapter. The caution labels and
markings are also explained.
Manual Configuration and Contents
This manual consists of the following three chapters, and the terminologies and abbreviations sections.
Chapter 1 SCSI Bus
This chapter describes the configuration, physical and electrical requirements, interface protocol, and other
operations of the Small Computer System Interface (SCSI) which connects the
MAW3073/MAW3147/MAW3300/MAX3036/MAX3073/MAX3147 NP/NC series intelligent disk drives
to the user system.
Chapter 2 SCSI Messages
This chapter describes the type and explanation of messages defined for SCSI bus operations.
Chapter 3 ERROR Recovery
This chapter describes error recovery processing executed by the MAW3073/MAW3147/MAW3300/
MAX3036/MAX3073/MAX3147 NP/NC series intelligent disk drives in response to various errors on the
SCSI bus.
Glossary
This section explains the terminologies the reader must understand to read this manual.
Abbreviations
This section lists the abbreviated terms and their full words used in this manual.
C141-C011 v
CONVENTIONS
This manual uses the following conventions:
NOTE: NOTE indicates the information useful for the user to operate the system.
Important information
The important information is provided with the "Important" title. The important information text is
centered so t hat the reader can distinguish it from other manual texts. The following gives an exampl e:
IMPORTANT
The IDD operates as a target (TARG) on the SCSI bus. The IDD is
called "TARG" in this chapter except when clear identification is
required.
Notations
A decimal value is indicated as it is in this manual.
A hexadecimal value is indicated in the X'17B9' or 17B9h or 17B9H notation.
A binary value is indicated in the notation similar to "010."
The disk drive model name has a different suffix depending on its SCSI electrical characteristics, capacity,
data format used during shipment and others. The following typical model name is used except when the
model needs to be distinguished. Also, the disk unit may be refe rred to as the "IDD" or "unit" in this
manual.
vi C141-C011
Note 1: Model name
M AW
3 300 NC
Interface type NP: Low-Voltage Differential, 16-bit SCSI Ultra-320,
68-pin connector
NC: Low-Voltage Differential, 16-bit SCSI Ultra-320,
SCA-2 connector
Formatted capacity (1,000 MB units)
Disk size
Type AW: 1-inch height (10,025 rpm)
AX: 1-inch height (15,000 rpm)
Note 2: Typical model name
Type model name Model name
MAW3300 MAW3300NP, MAW3300NC
MAW3147 MAW3147NP, MAW3147NC
MAW3073 MAW3073NP, MAW3073NC
MAX3147 MAX3147NP, MAX3147NC
MAX3073 MAX3073NP, MAX3073NC
MAX3036 MAX3036NP, MAX3036NC
Requesting for User's Comments
Please use the User's Comment Form attached to the end of this manual to identify user comments including
error, inaccurate and misleading information of this manual. Contact to your Fujitsu representative for
additional comment forms if required.
C141-C011 vii
MANUAL ORGANIZATION
Product/
Maintenance Manual
• General Description
• Specifications
• Data Format
• Installation Requirements
• Installation
• Diagnostics and Maintenance
• Error Analysis
• Principle of Operation
SCSI Physical
Interface
Specifications
• SCSI Bus
• SCSI Message
• Error Recovery
• Command Processing
SCSI Logical
Interface
Specifications
• Data Buffer M anagement
• Command Specifications
• Parameter Data Formats
• Sense Data and Error Recovery Methods
• Disk Media Mana gement
viii C141-C011
CONTENTS
page
CHAPTER 1
1.1 System Configuration.......................................................................................................................1-1
1.2 Interface Signal Definition...............................................................................................................1-3
1.3 Physical Requirements......................................................................................................................1-7
1.3.1 Interface connector.........................................................................................................................1-8
1.3.2 Interface cable..............................................................................................................................1-15
1.4 Electrical Requirements..................................................................................................................1-17
1.4.1 Single-Ended type ........................................................................................................................1-17
1.4.2 Low-Voltage Differential type .....................................................................................................1-20
1.4.3 Internal terminal resistor and power supply for terminating resistor............................................1-23
1.4.4 Usage in 8-bit/16-bit transfer mode..............................................................................................1-25
1.4.5 Signal driving conditions..............................................................................................................1-26
1.5 Timing Rule....................................................................................................................................1-28
1.5.1 Timing value ................................................................................................................................1-28
1.5.2 Measurement point.......................................................................................................................1-42
1.6 Bus Phases......................................................................................................................................1-47
1.6.1 BUS FREE phase.........................................................................................................................1-48
SCSI BUS ........................................................................................................................1-1
1.6.2 ARBITRATION phase.................................................................................................................1-49
1.6.2.1 Normal ARBITRATION..............................................................................................................1-49
1.6.2.2 QAS ARBITRATION..................................................................................................................1-52
1.6.3 SELECTION phase......................................................................................................................1-54
1.6.4 RESELECTION phase.................................................................................................................1-58
1.6.5 INFORMATION TRANSFER phases.........................................................................................1-61
1.6.5.1 Asynchronous transfer mode........................................................................................................1-62
1.6.5.2 Synchronous mode .......................................................................................................................1-65
1.6.5.3 Paced transfer...............................................................................................................................1-75
1.6.5.4 Wide mode transfer (16-bit SCSI)................................................................................................1-86
1.6.6 COMMAND phase.......................................................................................................................1-87
1.6.7 DATA phase.................................................................................................................................1-87
1.6.8 STATUS phase.............................................................................................................................1-89
1.6.9 MESSAGE phase.........................................................................................................................1-89
1.6.10 Signal requirements concerning transition between bus phases...................................................1-90
1.6.11 Time monitoring feature...............................................................................................................1-92
C141-C011 ix
Bus Conditions...............................................................................................................................1-93
1.7
1.7.1 ATTENTION condition...............................................................................................................1-93
1.7.2 RESET condition .........................................................................................................................1-96
1.8 Bus Phase Sequence.......................................................................................................................1-97
1.8.1 Bus Phase Sequence with Information Units Disabled.................................................................1-97
1.8.2 Phase sequences with information unit enabled .........................................................................1-105
1.8.2.1 Phase sequences for physical reconnection or selection without using attention condition........1-105
1.8.2.2 Phase sequences for selection using attention condition ............................................................1-106
1.9 SPI information units....................................................................................................................1-107
1.9.1 SPI information unit overview....................................................................................................1-107
1.9.2 Information unit transfer logical operations...............................................................................1-107
1.9.3 SPI information units..................................................................................................................1-113
1.9.3.1 SPI command information unit................................................................................................... 1-113
1.9.3.2 SPI L_Q information unit...........................................................................................................1-116
1.9.3.3 SPI data information unit............................................................................................................1-119
1.9.3.4 SPI data stream information unit................................................................................................1-119
1.9.3.5 SPI status information unit.........................................................................................................1-121
1.10 SCAM...........................................................................................................................................1-124
1.10.1 SCAM operations................................................................................................................ .......1-124
1.11 Ultra SCSI ....................................................................................................................................1-129
1.11.1 Outline........................................................................................................................................1-129
1.11.2 Device connection......................................................................................................................1-129
1.11.3 Electrical characteristics of SCSI parallel interface...................................................................1-130
1.12 Low-Voltage Differential .............................................................................................................1-134
1.12.1 Ultra2-SCSI................................................................................................................................1-134
1.12.2 Ultra-160....................................................................................................................................1-134
1.12.3 Ultra-320....................................................................................................................................1-134
1.12.4 LVD driver characteristics.........................................................................................................1-135
1.12.5 LVD receiver characteristics......................................................................................................1-135
1.12.6 LVD capacitive loads.................................................................................................................1-137
1.12.7 System level requirements for LVD SCSI drivers and receivers................................................1-138
1.13 SCSI bus fairness..........................................................................................................................1-139
CHAPTER 2 SCSI MESSAGE.............................................................................................................2-1
2.1 Message System...............................................................................................................................2-1
2.1.1 Message format ..............................................................................................................................2-1
2.1.2 Message type..................................................................................................................................2-3
x C141-C011
Message protocol ...........................................................................................................................2-4
2.1.3
2.2 SCSI Pointer.....................................................................................................................................2-5
2.3 Message Explanation........................................................................................................................2-8
2.3.1 TASK COMPLETE message: X'00'(T→I)...................................................................................2-8
2.3.2 SAVE DATA POINTER message: X'02'(T→I)............................................................................2-8
2.3.3 RESTORE POINTERS message: X'03' (T→1) ............................................................................2-8
2.3.4 DISCONNECT message: X'04' (T→I)...........................................................................................2-8
2.3.5 INITIATOR DETECTED ERROR message: X'05'(I→T)............................................................2-9
2.3.6 ABORT TASK SET message: X'06' (I→T)..................................................................................2-9
2.3.7 MESSAGE REJECT message: X'07'(I↔ T)................................................................................2-10
2.3.8 NO OPERATION message: X'08' (I→T)...................................................................................2-10
2.3.9 MESSAGE PARITY ERROR message: X'09' (I →T).................................................................2-10
2.3.10 LINKED TASK COMPLETE message: X'0A'(T→I).................................................................2-11
2.3.11 TARGET RESET message: X'0C' (I→T) ...................................................................................2-11
2.3.12 ABORT TASK message: X'0D' (I→T).......................................................................................2-11
2.3.13 CLEAR TASK SET message: X'0E'(I→T).................................................................................2-11
2.3.14 CONTINUE TASK message: X'12' (I→T).................................................................................2-12
2.3.15 TARGET TRANSFER DISABLE message : X'13' (I→T)..........................................................2-12
2.3.16 LOGICAL UNIT RESET message : X'1C' (I→T).......................................................................2-13
2.3.17 Task attribute messages................................................................................................................2-13
2.3.18 IGNORE WIDE RESIDUE message: X'23' (T→I).....................................................................2-14
2.3.19 IDENTIFY message: X'80' to X'FF' (I↔T) ................................................................................2-15
2.3.20 SYNCHRONOUS DATA TRANSFER REQUEST message (I↔T)..........................................2-16
2.3.21 WIDE DATA TRANSFER REQUEST message (I↔T) .............................................................2-24
2.3.22 PARALLEL PROTOCOL REQUEST message (I↔T)...............................................................2-28
CHAPTER 3 ERROR RECOVERY....................................................................................................3-1
3.1 Error Conditions and Retry Procedure.............................................................................................3-1
3.2 Recovery Control..............................................................................................................................3-6
GLOSSARY ....................................................................................................................................GL - 1
ABBREVIATION.................................................................................................................................AB - 1
C141-C011 xi
FIGURES
page
Figure 1.1
Figure 1.2 Interface signals...................................................................................................................1-3
Figure 1.3 DATA BUS and SCSI ID....................................................................................................1-4
Figure 1.4 SCSI interface connector (IDD side) (16-bit SCSI).............................................................1-8
Figure 1.5 SCSI interface connector (cable side) (16-bit SCSI) ...........................................................1-9
Figure 1.6 Single-ended connector pin assignment (16-bit SCSI).......................................................1-10
Figure 1.7 Low-Voltage-Differential connector pin assignment (16-bit SCSI)...................................1-11
Figure 1.8 SCA-2 type, 16-bit SCSI interface connector (IDD side).................................................. 1-12
Figure 1.9 SCA-2 Type, single-ended 16-bit SCSI connector signal assignment ...............................1-13
Figure 1.10 SCA Type, Low-Voltage-Differential connector signal assignment.................................. 1-14
Figure 1.11 Connection of interface cable ............................................................................................1-16
Figure 1.12 Single-Ended SCSI termination circuit-1...........................................................................1-17
Figure 1.13 Single-Ended SCSI termination circuit-2...........................................................................1-18
Figure 1.14 LVD SCSI termination circuit...........................................................................................1-20
Example of SCSI configuration...........................................................................................1-2
Figure 1.15 Circuit for mated indications..............................................................................................1-23
Figure 1.16 16-bit SCSI (not SCA2) terminating resistor circuit..........................................................1-24
Figure 1.17 Receiver de-skew parameters.............................................................................................1-38
Figure 1.18 Transmitter skew................................................................................................................1-40
Figure 1.19 Transmitter time asymmetry ..............................................................................................1-41
Figure 1.20 Fast-5/10 Measurement Point............................................................................................1-42
Figure 1.21 Fast-20 Measurement Point...............................................................................................1-43
Figure 1.22 LVD ST Data Transfer measurement point.......................................................................1-44
Figure 1.23 LVD DT Data Transfer measurement point.......................................................................1-45
Figure 1.24 LVD mode DT paced transfer easurement point................................................................1-46
Figure 1.25 BUS FREE phase...............................................................................................................1-48
Figure 1.26 ARBITRATION phase......................................................................................................1-51
Figure 1.27 QAS phase.........................................................................................................................1-54
Figure 1.28 SELECTION phase............................................................................................................1-57
Figure 1.29 RESELECTION phase ......................................................................................................1-60
Figure 1.30 INFORMATION TRANSFER phase (phase control).......................................................1-61
Figure 1.31 Transfer in asynchronous mode .........................................................................................1-64
Figure 1.32 ST transfer in synchronous mode.......................................................................................1-68
Figure 1.33 Data Group Pad field and pCRC field transfer ..................................................................1-74
xii C141-C011
Figure 1.34
Figure 1.35 DT DATA OUT phase training pattern .............................................................................1-80
Figure 1.36 Usage of P1 to establish data valid and data invalid states................................................1-81
Figure 1.37 READ STREAM and WRITE FLOW...............................................................................1-84
Figure 1.38 Data sequence at data transfer............................................................................................1-87
Figure 1.39 Data transfer rate in synchronous mode.............................................................................1-89
Figure 1.40 Switching direction of transfer over data bus.....................................................................1-91
Figure 1.41 ATTENTION condition.....................................................................................................1-95
Figure 1.42 condition ...............................................................................................................................1-97
Figure 1.43 Bus phase sequence ..........................................................................................................1-98
Figure 1.44 Example of bus phase transition at execution of a single command................................1-100
Figure 1.45 Phase sequences for physical reconnection or selection without
Figure 1.46 Phase sequences for selection with attention condition
Figure 1.47 SPI information unit sequence during initial connection .................................................1-109
Figure 1.48 SPI information unit sequence during data type transfers ................................................1-110
Figure 1.49 SPI information unit sequence during data stream type transfers....................................1-111
DT DATA IN phase training pattern .................................................................................1-78
using attentioncondition with information unit transfers enabled ....................................1-105
with information unit transfers enabled............................................................................1-106
Figure 1.50 SPI information unit sequence during status transfers.....................................................1-112
Figure 1.51 State of level-1 SCAM target...........................................................................................1-126
Figure 1.52 State of level-2 SCAM target...........................................................................................1-127
Figure 1.53 Comparison of active negate current and voltage ............................................................1-132
Figure 1.54 Single-ended test circuit...................................................................................................1-133
Figure 1.55 LVD transceiver architecture...........................................................................................1-135
Figure 1.56 Connection to the LVD receivers.....................................................................................1-136
Figure 1.57 Differential SCSI bus capacitive loading .........................................................................1-137
Figure 2.1 Message format....................................................................................................................2-2
Figure 2.2 SCSI pointer configuration.................................................................................................. 2-7
C141-C011 xiii
TABLES
page
Table 1.1
Table 1.2 Single-Ended maximum distance between terminators........................................................1-7
Table 1.3 LVD maximum distance between terminators .....................................................................1-8
Table 1.4 SE and LVD Transmission line impedance of cable at maximum
Table 1.5 Attenuation Requiaments for SCSI cable media................................................................1-15
Table 1.6 Output characteristic..........................................................................................................1-19
Table 1.7 Input characteristic.............................................................................................................1-19
Table 1.8 LVD DIFFSENS driver specifications...............................................................................1-21
Table 1.9 DIFFSENS receiver operating requirements......................................................................1-21
Table 1.10 Requirements for terminating resistor power supply..........................................................1-23
Table 1.11 Setting set up pin, 16-bit (wide)/8-bit (narrow) mode........................................................1-25
Table 1.12 Signal status at receiving end.............................................................................................1-26
Table 1.13 Signal driving method........................................................................................................1-26
Table 1.14 Bus phases and signal sources ........................................................................................... 1-27
Table 1.15 SCSI bus control timing values..........................................................................................1-28
Table 1.16 SCSI bus data & information phase ST timing values.......................................................1-29
INFORMATION TRANSFER phase identification............................................................1-6
indicated data transfer rate.................................................................................................1-15
Table 1.17 Miscellaneous SCSI bus data & information phase DT timing values...............................1-29
Table 1.18 SCSI bus data & information phase DT timing values ......................................................1-30
Table 1.19 Receive SCSI bus data & information phase DT timing values......................................... 1-31
Table 1.20 Parameters used for fast synchronous data transfer mode..................................................1-88
Table 1.21 Retry count setting for RESELECTION phase..................................................................1-92
Table 1.22 SPI command information unit........................................................................................1-114
Table 1.23 TASK ATTRIBUT E........................................................................................................1-114
Table 1.24 TASK MANAGEMENT FUNCTIONS..........................................................................1-115
Table 1.25 SPI L_Q information unit ................................................................................................1-116
Table 1.26 TYPE...............................................................................................................................1-117
Table 1.27 BIDI DIRECTION...........................................................................................................1-118
Table 1.28 SPI data information unit.................................................................................................1-119
Table 1.29 SPI data stream information unit......................................................................................1-120
Table 1.30 SPI status information unit...............................................................................................1-121
Table 1.31 PACKETIZED FAILURES field.....................................................................................1-122
Table 1.32 PACKETIZED FAILURE CODE ...................................................................................1-123
xiv C141-C011
Table 1.33
Table 1.34 System level requirements...............................................................................................1-139
Table 2.1 SCSI message ......................................................................................................................2-3
Table 2.2 Extended message................................................................................................................2-4
Table 2.3 Definition of data transfer mode by message exchange.....................................................2-17
Table 2.4 Synchronous mode data transfer request setting................................................................2-19
Table 2.5 Transfer mode setup request from INIT to IDD ................................................................2-21
Table 2.6 Transfer mode setup request from IDD to INIT ................................................................2-23
Table 2.7 Data bus width defined by message exchange ...................................................................2-25
Table 2.8 Wide mode setting request from the INIT to the IDD .......................................................2-27
Table 2.9 Wide mode setting request from the IDD to the INIT .......................................................2-28
Table 2.10 TRANSFER PERIOD FACTOR field...............................................................................2-29
Table 2.11 Valid protocol options bit combinations............................................................................2-31
Table 2.12 PARALLEL PROTOCOL REQUEST message implied agreement..................................2-33
Table 3.1 Retry procedure for SCSI error............................................................................................3-7
Maximum capacitance.....................................................................................................1-138
C141-C011 xv
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CHAPTER 1 SCSI BUS
1.1 System Configuration
1.2 Interface Signal Definition
1.3 Physical Requirements
1.4 Electrical Requirements
1.5 Timing Rule
1.6 Bus Phases
1.7 Bus Conditions
1.8 Bus Phase Sequence
1.9 SPI information units
1.10 SCAM
1.11 Ultra SCSI
1.12 Low-Voltage Differential
1.13 SCSI Bus Fairness
This chapter describes the configuration, physical and electrical characteristics, interface protocol, and
operations of SCSI buses.
Note:
The IDD operates as a target (TARG) on the SCSI bus. The IDD is called "TARG" in this
chapter except when clear identification is required.
1.1 System Configuration
Up to 16-bit SCSI series models can be connected to the system via the SCSI bus. Figure 1.1 gives
an example of multi-host system configuration.
Each SCSI device operates as an initiator (INIT) or a target (TARG). Only a single INIT and a
single TARG selected by this INIT can operate simultaneously on the SCSI bus.
The system configuration allows any combination of a SCSI device to operate as the INIT and a
SCSI device to operate as the TARG. Also, any device having both the INIT and TARG functions
can be used on the SCSI bus.
Each SCSI device is assigned a unique address (or SCSI ID). The SCSI ID corresponds to a bit
number of the SCSI data bus. While the INIT uses a logical unit number (LUN) to select an I/O
unit to be connected under TARG control.
C141-C011 1-1
Any SCSI ID of the IDD can be selected using the setup pins. However, the LUN is fixed to zero
(0). The SCSI ID can be 0 to 15.
Note:
The maximum number of SCSI devices and the maximum cable length are limited depending
on the selected SCSI data transfer mode and the SCSI transceiver type. Appropriate SCSI
devices and cable length must be determined for each system.
1-2 C141-C011
Figure 1.1 Example of SCSI configuration
1.2 Interface Signal Definition
Figure 1.2 shows interface signal types. The SCSI bus consists of 27 signal lines. The 27 signal
lines consist of data buses (2 bytes plus two odd parity bits) and 9 control signal lines.
The SCSI bus can be a single-ended or low voltage differential(LVD) interface depending on the
model used. Their physical and electrical characteristics are detailed in Sections 1.3 and 1.4.
P_CRCA (18)
C141-C011 1-3
Figure 1.2 Interface signals
(1) DB15 to DB00, P1, P_CRCA (Data buses)
The 16-bit SCSI system uses a bidirectional data bus consisting of two-byte data and two odd
parity bits.
MSB (2
15
): DB15, LSB (20): DB00
The data bus is used to transfer a command, data, a status, or a message in the INFORMATION
TRANSFER phase. However, DB15 to DB08 and P1 are used for data transfer only. The data is
transferred only after the WIDE DATA TRANSFER REQUEST or PARALLEL PROTOCOL
REQUEST message has been exchanged and the 16-bit data transfer mode has been established
between the INIT and TARG.
In the ARBITRATION phase, the data bus is used to send a SCSI ID to determine the bus
arbitration priority. In the SELECTION or RESELECTION phase, the data bus is used to send a
SCSI ID of the INIT and TARG. Figure 1.3 shows the relationship between the data buses and
SCSI IDs.
(16 bit SCSI)
DB15 DB14 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
SCSI ID #0
SCSI ID #1
SCSI ID #2
SCSI ID #3
SCSI ID #4
SCSI ID #5
SCSI ID #6
SCSI ID #14
SCSI ID #15
SCSI ID #9
SCSI ID #7
SCSI ID #8
Data bus
Figure 1.3 DATA BUS and SCSI ID
(a) DB15 to 0
Sixteen data-bit signals that form the 16-bit DATA BUS.
(b) DB7 to 0
Eight data-bit signals that form the 16-bit DATA BUS.
(c) P1 (ST DATA phase)
A signal sourced by the SCSI device driving the data bus during ST DATA phases. This signal is
associated with the DB(15-8) signals and is used to detect the presence of an odd number of bit
errors within the byte. The parity bit is driven such that the number of logical ones in the byte plus
the parity bit is odd.
1-4 C141-C011
(d) P1 (data group transfer enabled)
A signal that shall be continuously negated by the SCSI device driving the DB(15-0) signals and
shall be ignored by the SCSI device receiving the DB(15-0) signals during DT DATA phases.
(e) P1 (information unit and paced transfer enabled)
A signal that is sourced by SCSI device to indicate the data valid or data invalid state.
(f) P_CRCA (PARITY/CRC AVAILABLE) (SELECTION phase, ST DATA phase, COMMAND phase,
MESSAGE phase, or STATUS phase)
A signal sourced by the SCSI device driving the data bus during these phases. This signal is
associated with the DB(7-0) signals and is used to detect the presence of an odd number of bit
errors within the byte. The parity bit is driven such that the number of logical ones in the byte plus
the parity bit is odd.
The parity bits (P1 and P_CRCA) is optional for the system. The IDD handles the data bus parity
as follows:
• The IDD has the data bus parity check function, and can enable or disable the parity check.
See Section 5.3.2 "SCSI Parity" of the Product Manual for setup details.
• When valid data is sent to the data bus from the IDD, the parity data is always guaranteed
except for the ARBITRATION phase.
(g) P_CRCA (data group transfer enabled)
A signal sourced by a target during DT DATA phases to control whether a data group field is a pad
field, pCRC field, or data field. When asserted the data group field shall be pad or pCRC fields
that shall not be transferred to the ULP. When negated the data group field shall be a data field that
shall be transferred to the ULP.
Note:
ULP is "Upper Level Protocol".
(h) P_CRCA (information unit and paced transfer enabled)
During DT DATA phases when information unit transfers are enabled this signal is referred to as
P_CRCA and is sourced by the SCSI target port. Depending on the negotiated condition of read
streaming and write flow control the SCSI initiator port and SCSI target port usage for P_CRCA is
different. When information unit transfers are enabled the SCSI target port and SCSI initiator port
shall use the P_CRCA signal.
C141-C011 1-5
(2) BSY (BUSY)
The BSY signal indicates that the SCSI bus is in use. In the ARBITRATION phase, this signal is
used to request for the bus usage priority.
(3) SEL (SELECT)
The SEL signal is used by the INIT to select a TARG (in the SELECTION phase) or by the TARG
to reselect an INIT (in the RESELECTION phase).
(4) C/D (CONTROL/DATA)
This is a combination of I/O and MSG signals, and specifies a type of information transferred on
the data bus. The C/D signal is always driven by the TARG (see Table 1.1).
(5) I/O (INPUT/OUTPUT)
The I/O signal specifies the information transmission direction on the data bus. It is also used to
identify the SELECTION phase or RESELECTION phase. This signal is always driven by the
TARG (see Table 1.1).
(6) MSG (MESSAGE)
A signal sourced by a target to indicate the MESSAGE phase or a DT DATA phase depending on
whether C/D is true or false. Asserted indicates MESSAGE or DT DATA (see Table 1.1).
Table 1.1 INFORMATION TRANSFER phase identification
Signal
C/D MSG I/O
0 0 0 ST DATA OUT INIT -> TARG
0 0 1 ST DATA IN INIT <- TARG
0 1 0 DT DATA OUT INIT -> TARG
0 1 1 DT DATA IN INIT <- TARG
Phase Direction Comment
ST Data phase
Data phase
DT Data phase
1 0 0 COMMAND INIT -> TARG
1 0 1 STATUS INIT <- TARG
1 1 0 MESSAGE OUT INIT -> TARG
1 1 1 MESSAGE IN INIT <- TARG
MESSAGE
1-6 C141-C011
(7) REQ (REQUEST)
This is a transmission request from the TARG to the INIT in the INFORMATION TRANSFER
phase.
(8) ACK (ACKNOWLEDGE)
The ACK signal is a response to the REQ signal sent from the INIT to TARG in the
INFORMATION TRANSFER phase.
(9) ATN (ATTENTION)
The ATN signal indicates that the INIT has a message to be sent to the TARG. It is used to
generate an ATTENTION condition.
(10) RST (RESET)
The RST signal is a Reset signal to clear all SCSI devices on the bus (to the RESET condition).
1.3 Physical Requirements
All SCSI devices are connected to each other in a daisy chain. Both ends of the interface cable are
terminated with resistor.
Tables 1.2 and 1.3 define the SCSI bus electrical characteristics (for interface signal
driver/receiver).
Table 1.2 Single-Ended maximum distance between terminators
Maximum distance between
Number of
terminators (meters)
attached devices
FAST-5 FAST-10 FAST-20
2 to 4 devices 6 3 3
5 to 8 devices 6 3 1.5
9 to 16 devices 6 3 N/A
C141-C011 1-7
Table 1.3 LVD maximum distance between terminators
Interconnect
Fast-5 Fast-10 Fast-20 Fast-40 Fast-80 Fast-160
Maximum distance between terminators (meters)
Point-to-point 25 25 25 25 25 25
Multidrop 12 12 12 12 12 12
1.3.1 Interface connector
(1) Interface connector of the 16-bit SCSI
The IDD 16-bit SCSI bus connector is nonshielded 68-pin, consisting of two 34-pin rows with
adjacent pins 1.27 mm (0.05 inch) part (Figure 1.4).
For the interface cable connector, use a nonshielded 68-contact socket consisting of two 34-contact
rows points with adjacent contact points 1.27 mm (0.05 inch) apart (Figure 1.5).
Figure 1.6 shows single-ended interface connector signal assignment.
Figure 1.7 shows low-voltage-differential interface connector signal assignment.
Figure 1.4 SCSI interface connector (IDD side) (16-bit SCSI)
1-8 C141-C011
M
M
Figure 1.5 SCSI interface connector (cable side) (16-bit SCSI)
C141-C011 1-9
0.396
0.61
5.16
0.001
Pin No. Signal Signal Pin No.
01 GND -DB12 35
02 GND -DB13 36
03 GND -DB14 37
04 GND -DB15 38
05 GND -DBP1 39
06 GND -DB00 40
07 GND -DB01 41
08 GND -DB02 42
09 GND -DB03 43
10 GND -DB04 44
11 GND -DB05 45
12 GND -DB06 46
13 GND -DBP7 47
14 GND -P_CRCA 48
15 GND GND 49
16 GND GND 50
17 TERMPWR * TERMPWR * 51
18 TERMPWR * TERMPWR * 52
19 (reserved) (reserved) 53
20 GND GND 54
21 GND -ATN 55
22 GND GND 56
23 GND -BSY 57
24 GND -ACK 58
25 GND -RST 59
26 GND -MSG 60
27 GND -SEL 61
28 GND -C/D 62
29 GND -REQ 63
30 GND -I/O 64
31 GND -DB08 65
32 GND -DB09 66
33 GND -DB10 67
34 GND -DB11 68
* Terminating resistor power
Figure 1.6 Single-ended connector pin assignment (16-bit SCSI)
1-10 C141-C011
Pin No. Signal Signal Pin No.
01 +DB(12) -DB(12) 35
02 +DB(13) -DB(13) 36
03 +DB(14) -DB(14) 37
04 +DB(15) -DB(15) 38
05 +DB(P1) -DB(P1) 39
06 +DB(0) -DB(0) 40
07 +DB(1) -DB(1) 41
08 +DB(2) -DB(2) 42
09 +DB(3) -DB(3) 43
10 +DB(4) -DB(4) 44
11 +DB(5) -DB(5) 45
12 +DB(6) -DB(6) 46
13 +DB(7) -DB(7) 47
14 +P_CRCA -P_CRCA 48
15 GROUND GROUND 49
16 DIFFSENS GROUND 50
17 TERMPWR * TERMPWR * 51
18 TERMPWR * TERMPWR * 52
19 RESERVED RESERVED 53
20 GROUND GROUND 54
21 +ATN -ATN 55
22 GROUND GROUND 56
23 +BSY -BSY 57
24 +ACK -ACK 58
25 +RST -RST 59
26 +MSG -MSG 60
27 +SEL -SEL 61
28 +C/D -C/D 62
29 +REQ -REQ 63
30 +I/O -I/O 64
31 +DB(8) -DB(8) 65
32 +DB(9) -DB(9) 66
33 +DB(10) -DB(10) 67
34 +DB(11) -DB(11) 68
* Terminating resistor power
Figure 1.7 Low-Voltage-Differential connector pin assignment (16-bit SCSI)
C141-C011 1-11
(2) Interface connector of SCA-2 type 16-bit SCSI
The 16-bit, SCA-2 type SCSI bus connectors of the IDD are 80-pin, unshielded connectors, each
having two rows of 40 parallel pins (separated 1.27 mm or 0.05" from each other) (see Figure 1.8).
Figure 1.9 shows the pin assignment of 16-bit, SCA-2 type single-ended SCSI interface connector.
Figure 1.8 SCA-2 type, 16-bit SCSI interface connector (IDD side)
1-12 C141-C011
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