Ciprico Rimfire 3880 User Manual Page 187
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User’s Guide 21020285 D
Chapter 8 Details of Usage
Target Mode Usage and SCSI Protocol Handling Page 8 - 13
Wide Data
Transfer
Requests
When Wide Data Transfers are enabled, (WID bit set to 1, of the Unit Flags
byte of either the Unit Options, 08H, or Extended Unit Options, 18H,
commands), the adapter will send a Wide Data Transfer Request (WDTR)
message whenever it determines that the data transfer agreement is in an
indeterminate state. The adapter will initiate the exchange of WDTR messages
immediately before starting the data transfer phase. The adapter will also send
a WDTR message in response to a WDTR message received from the initiator.
Unexpected
Messages
Received from
the Initiator
If an abort, bus device reset, or related message is received (during Target Mode
command processing), it will be passed to the host as an unexpected event. The
adapter will not disconnect from the SCSI bus until instructed to do so by the
host. After receiving the message, the host issues the necessary adapter
commands (Abort command) followed by a Target Mode Response command
containing a Bus Free instruction to release the SCSI bus.
Automatic
Adapter
Responses
The adapter will automatically respond to several events without input from
the host. These events are:
• Adapter-detected parity errors
• A received Initiator-detected Error message
• A received Message Parity Error message
The adapter will retry the operation in progress whenever any of these events
occur. The adapter will continue to retry the operation until the configured retry
limit is exceeded (adapter Unit Options command).
Once the retry limit is reached, the adapter will attempt to send a status of Check
Condition followed by a message of Command Complete. If a status byte has
been sent, a Restore Pointers message is sent. This means that when the retry
limit for a command is reached, the command can end in either of two ways:
• A status byte followed by a message
• A message followed by a status byte followed by a message
If the status/message cannot be sent without error, the adapter will go to the
Bus Free phase (an unexpected disconnect). The Host will be notified of this
occurrence and should prepare sense data for the initiator (Contingent
Allegiance Condition).
The adapter will also automatically respond to the initiator’s data transfer
negotiation requests:
• Synchronous Data Transfer Request (SDTR) message.
• Wide Data Transfer Request (WDTR) message.
- Rimfire 3880 SCSI Host 1
- Organization 5
- Conventions 7
- Documents 8
- Table of 9
- Contents 9
- Product Overview 21
- About the 22
- Rimfire 3880 22
- Management 23
- What next? 24
- Hardware Essentials 25
- Structure and 27
- Description 27
- Block Diagram 28
- Addressing 29
- Ports: General 30
- Address Buffer 32
- SET 0 0 0 0 WID WSC BSC 33
- Channel 34
- Attention Port 34
- Status Port: 38
- Reset Port 40
- Descriptions of 41
- Port Usage 41
- Hardware Installation 43
- Overview of the 45
- Installation 45
- Step 1: 46
- Unpacking the 46
- Step 2: 47
- Jumpers and 47
- Termination 47
- Configuration 48
- Bus Request/ 49
- Grant Jumper 49
- Addresses 51
- SCSI bus 52
- Step 3: Board 53
- Insertion 53
- Step 4: Apply 54
- Conditions 55
- Step 5: 56
- Configure and 56
- Connect SCSI 56
- Command Operation 59
- What the 61
- Adapter must 61
- The Base 62
- Parameter 62
- Multiple 66
- Status Blocks 66
- 000 0 0 INT ID 68
- Using a Single 69
- Some Example 70
- 2:Inquiry 73
- Pass-through 73
- Command List 76
- Creating the 78
- Using a 79
- Adding a 80
- Removing a 80
- Example ‘C’ 81
- Routines for 81
- Initiator Mode Pass 85
- Initiator Pass 87
- Block Format 87
- DBV 0 ICC 0 IRS DAT DIR 0 88
- Setting DBV 89
- DAT and DIR 89
- Table Values 89
- Table of DAT 90
- Automatic 90
- Settings 90
- 21020285 D User’s Guide 102
- Target Mode Pass 103
- Introduction 104
- Overview of 105
- Target Mode 105
- What must the 106
- Target Mode? 106
- Commands 107
- Special Target 107
- Command 108
- Descriptor 108
- Block Group 108
- Operation 109
- Sequence of 111
- Responding to 111
- Selection Data 112
- Structure 112
- 76543210 113
- CC ERR RTY 0 0 0 0 TME 113
- 0000000SAV 116
- Response 117
- 0 0 ICC TMO 0 DAT DIR 0 118
- Status Block 121
- CC ERR RTY 0 0 CSB 0 TMS 122
- Board-control Commands 125
- Using the 127
- Reference 127
- General Status 128
- List of 129
- Start Command 130
- List (01H) 130
- 1514131211109876543210 131
- 0 0 0 0 0 INT Status/ID 131
- Stop Command 132
- List (02H) 132
- Identify (05H) 133
- Identify 134
- Description of 134
- Statistics (06H) 136
- Statistics Data 138
- General 139
- Options (07H) 139
- Unit Options 142
- 0 0 0 RBE RCE RPE ISB INT 143
- 0 TAG 0 0 WID IAT SYN UNQ 144
- Diagnostic/ 148
- Self-test (09H) 148
- Enable (0AH) 151
- 000 0 0 INT Status/ID 152
- Disable (0BH) 153
- Abort (0DH) 154
- SCSI Hard 155
- Reset (10H) 155
- Information 156
- Data Structure 157
- Extended 165
- Statistics (16H) 165
- Extended Unit 169
- Options (18H) 169
- Options Data 170
- Details of Usage 175
- Byte and Word 177
- Swapping 177
- How to Use 182
- How It Works 183
- Notes on 184
- Usage and 185
- SCSI Protocol 185
- Handling 185
- Routines 188
- Disconnect 189
- Privilege 189
- Error Codes 193
- User’s Guide 21020285 D 195
- Appendix A Error Codes 195
- Summary Page A - 3 195
- Table 116: Error Codes 195
- Appendix A Error Codes 196
- Page A - 4 Summary 196
- Summary Page A - 5 197
- Status Port 198
- Self-test Error 199
- Self-test 199
- Cables and Connectors 201
- Connector 203
- Table 123: P2 Connector 205
- Specifications 207
- Appendix C Specifications 210
- Page C - 4 Specifications 210
- Defaults 211
- Hardware 213
- Appendix D Defaults 216
- Design Differences 217
- Features no 219
- Supported 219
- Implementation 220
- Differences 220
- Maximize 222
- Performance 222
- Index 224
- Page ii 224
- Index 225
- Page iii 225
- Page iv 226
- Page vi 228
- 21020285 D 230
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