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Seagate Ultra 320 Product Manual

Seagate Ultra 320 Product Manual (186 pages)

Parallel SCSI Interface

Brand: Seagate | Category: Computer Hardware | Size: 5.38 MB

Table of Contents

Parallel Scsi Interface
1
Table of Contents
7
1 Interface Requirements

15
- How to Use this Interface Manual
  15
  - Scope of SCSI Standards
    16
  - Applicable Standards
    17
- General Interface Description
  17
  - Glossary
    18
  - Keywords
    25
- Physical Interface Characteristics
  26
- Summary of SCSI Messages
  26
2 SCSI Bus

27
- SCSI Bus Signals Overview
  29
  - Drive Select
    31
  - Signal Values
    31
- Signal States
  31
  - SE Signals
    31
  - LVD Signals
    31
- OR-Tied Signals
  32
- Signal Sources
  33
- SCSI Bus Timing
  34
  - Arbitration Delay
    40
  - ATN Transmit Setup Time
    40
  - ATN Receive Setup Time
    40
  - Bus Clear Delay
    41
  - Bus Free Delay
    41
  - Bus Set Delay
    41
  - Bus Settle Delay
    41
  - Cable Skew Delay
    41
  - Chip Noise in Receiver
    41
  - Clock Jitter
    41
  - Crosstalk Time Shift
    41
  - De-Skewed Data Valid Window
    42
  - Flow Control Receive Hold Time
    42
  - Flow Control Receive Setup Time
    42
  - Flow Control Transmit Hold Time
    42
  - Flow Control Transmit Setup Time
    42
  - Pcrc Receive Hold Time
    42
  - Pcrc Receive Setup Time
    42
  - Pcrc Transmit Hold Time
    42
  - Pcrc Transmit Setup Time
    42
  - Data Release Delay
    43
  - DIFFSENS Voltage Filter Time
    43
  - Offset Induced Time Asymmetry
    43
  - Physical Disconnection Delay
    43
  - Power on to Selection
    43
  - QAS Arbitration Delay
    43
  - QAS Assertion Delay
    43
  - QAS Release Delay
    43
  - QAS Non-Data Phase REQ(ACK) Period
    43
  - Receive Assertion Period
    43
  - Receive Internal Hold Time
    44
  - Receive Internal Setup Time
    44
  - Receive Negation Period
    44
- Receive Setup Time
  44
- Receive REQ(ACK) Period Tolerance
  44
- Receive REQ Assertion Period with P_CRCA Transitioning
  44
- Receive REQ Negation Period with P_CRCA Transitioning
  44
- Receive Skew Compensation
  44
- Receiver Amplitude Time Skew
  45
- REQ(ACK) Period
  45
- Reset Delay
  45
- Reset Hold Time
  45
- Reset to Selection
  45
- Residual Skew Error
  45
- Selection Abort Time
  45
- Selection Timeout Delay
  45
- Signal Timing Skew
  45
- Skew Correction Range
  46
- Strobe Offset Tolerance
  46
- System Deskew Delay
  46
- System Noise at Launch
  46
- System Noise at Receiver
  46
- Time Asymmetry
  46
- Transmit Assertion Period
  46
- Transmit Hold Time
  46
- Transmit ISI Compensation
  46
- Transmit Negation Period
  46
- Transmit Setup Time
  47
- Transmit REQ(ACK) Period Tolerance
  47
- Transmit REQ Assertion Period with P_CRCA Transitioning
  47
- Transmit REQ Negation Period with P_CRCA Transitioning
  47
- Transmitter Skew
  47
- Transmitter Time Asymmetry
  47
- Measurement Points
  47
- Clocking Methods for Data Transfers
  48
- Paced Transfer on a SCSI Bus
  50
- Data Transfer Modes
  51
  - Asynchronous Transfers
    51
  - Synchronous Transfers
    51
  - Paced Transfers
    51
- ST DATA Phase Parallel Transfers
  52
- DT DATA Phase Parallel Transfers
  52
  - Data Group Transfers
    52
  - Information Unit Transfers
    52
- Negotiation
  53
  - Negotiation Algorithm
    53
  - When to Negotiate
    54
  - Negotiable Fields
    54
  - Transfer Agreements
    56
  - Transfer Period Factor
    57
  - REQ/ACK Offset
    58
  - Transfer Width Exponent
    58
  - Protocol Options
    59
    
    1Iu_Req
    59
    
    5Wr_Flow
    59
    
    2Dt_Req
    60
    
    3Qas_Req
    60
    
    4Hold_Mcs
    60
    
    6Rd_Strm
    61
    
    7RTI (Retain Training Information)
    61
    
    8Pcomp_En
    61
    
    Negotiable Field Combinations
    62
    
    Message Restrictions
    63
    
    Negotiation Message Sequences
    63
3 Logical Characteristics

65
4 Message System Specification

97
- General Message Protocols and Formats
  97
- Message Formats
  97
  - One-Byte Messages
    98
  - Two-Byte Messages
    98
  - Extended Messages
    98
- Message Categories
  99
  - Link Control Messages
    99
  - Disconnect
    101
  - Identify
    101
  - Ignore Wide Residue
    102
  - Initiator Detected Error
    103
  - Linked Command Complete
    103
  - Message Parity Error
    103
  - Message Reject
    103
  - Modify Data Pointer
    103
  - Modify Bidirectional Data Pointer
    104
  - No Operation
    105
  - Parallel Protocol Request
    106
    
    1Parallel Protocol Request
    109
  - Qas Request
    110
  - Restore Pointers
    110
  - Save Data Pointers
    110
  - Synchronous Data Transfer Request
    111
    
    1Target Initiated SDTR Negotiation
    113
    
    2Initiator Initiated SDTR Negotiation
    113
  - Task Complete
    113
  - Wide Data Transfer Request
    114
    
    1Target Initiated WDTR Negotiation
    115
    
    2Initiator Initiated Wide Data Transfer Request (WDTR) Negotiation
    116
- Task Attribute Messages
  116
  - Task Attribute Message Overview and Codes
    116
  - Aca (Auto Contingent Allegiance)
    117
  - Head of Queue
    118
  - Ordered
    118
  - Simple
    118
- Task Management Messages
  119
  - Task Management Message Codes
    119
  - Abort Task
    119
  - Abort Task Set
    120
  - Clear Aca
    120
  - Clear Task Set
    120
  - Logical Unit Reset
    120
  - Target Reset
    120
5 Miscellaneous SCSI Bus Characteristics

121
- Attention Condition
  121
- Bus Reset Condition
  122
- Hard Reset
  122
- Reset Events
  123
  - Bus Reset Event
    123
  - Power on Reset Event
    123
  - Target Reset Event
    123
  - Transceiver Mode Change Reset Event
    123
- Asynchronous Condition Recovery
  123
  - SCSI Pointers
    123
  - Active Pointers
    124
  - Saved Pointers
    124
- Command Processing Considerations and Exception Conditions
  125
6 SPI Information Units

127
- Information Unit Transfer Logical Operations
  127
- SPI Information Units
  132
  - SPI Command Information Unit
    132
  - SPI L_Q Information Unit
    135
  - SPI Data Information Unit
    139
  - SPI Data Stream Information Unit
    139
  - SPI Status Information Unit
    141
7 SCSI Commands

145
- Command Implementation Requirements
  145
  - Reserved
    145
- Command Descriptor Block (CDB)
  145
  - Fixed and Variable Length Command Descriptor Block Formats
    147
- Status
  152
  - Status Precedence
    153
- Command Examples
  154
  - Single Command Example
    154
  - Disconnect Example
    155
- Timing Examples
  156
  - Auto Contingent Allegiance or Contingent Allegiance
    156
    
    Logical Unit Response to Auto Contingent Allegiance or Contingent Allegiance
    156
    
    Clearing an Auto Contingent Allegiance Condition
    157
  - Command Processing Considerations and Exception Conditions
    156
  - Overlapped Commands
    157
  - Incorrect Logical Unit Selection
    158
  - Sense Data
    158
    
    Asynchronous Event Reporting
    158
    
    Autosense
    159
    
    Unexpected RESELECTION Phase
    159
  - Unit Attention Condition
    160
  - Logical Unit Reset
    161
  - Queued Tasks (Formerly "Queued I/O Processes")
    161
  - Target Hard Reset
    161
  - Untagged Task Queuing
    161
  - Tagged Task Queuing
    162
- Parameter Rounding
  163
- Programmable Operating Definition
  163
- Incorrect Initiator Connection
  164
8 Drive Features

165
- S.M.A.R.T. System
  165
- Self-Test Operations
  165
  - Default Self-Test
    165
  - The Short and Extended Self-Tests
    165
  - Self-Test Modes
    166
    
    Background Mode
    166
    
    Foreground Mode
    166
    
    Elements Common to Foreground and Background Self-Test Modes
    167
    
    Message, and Status
    168
  - Error Detection for Asynchronous Information Phases
    168
  - Protection Code
    168
    
    Covered Signals
    169
    
    Code Description
    171
    
    Error Detection Properties
    171
  - Protection Code Usage
    171
    
    Disabling Protection Code Checking
    172
    
    Enabling Protection Code Checking
    172
    
    Protection Code Transmission
    172
  - Parity
    172
  - Error Handling
    172
  - Removal and Insertion of SCSI Devices (Popularly Known as "Hot Plugging")
    172
  - Removal and Insertion of SCSI Devices Overview
    172
    
    Case 1—Power off During Removal or Insertion
    173
    
    Case 2—RST Signal Asserted Continuously During Removal or Insertion
    173
    
    Case 3—Current I/O Processes Not Allowed During Insertion or Removal
    173
    
    Case 4—Current I/O Process Allowed During Insertion or Removal
    173
- SPI-3 to SCSI-2 Terminology Mapping
  174

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