ISO/IEC 14776-262:2017

ISO/IEC 14776-262
Edition 1.0 2017-02
INTERNATIONAL
STANDARD

colour
inside
Information technology – Small Computer System Interface (SCSI) –
Part 262: SAS Protocol Layer – 2 (SPL-2)

ISO/IEC 14776-262:2017-02(en)

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ISO/IEC 14776-262


Edition 1.0 2017-02




INTERNATIONAL



STANDARD








colour

inside










Information technology – Small Computer System Interface (SCSI) –

Part 262: SAS Protocol Layer – 2 (SPL-2)



























INTERNATIONAL

ELECTROTECHNICAL

COMMISSION






ICS 35.200 ISBN 978-2-8322-3952-0



  Warning! Make sure that you obtained this publication from an authorized distributor.

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ISO/IEC 14776-262:2017 © ISO/IEC 2017 – 2 –
FOREWORD. 37
INTRODUCTION. 38
General . 38
SCSI standards family. 39
1 Scope. 40
2 Normative references. 41
3 Terms, definitions, symbols, abbreviations, keywords, and conventions. 42
3.1 Terms and definitions . 42
3.2 Symbols and abbreviations . 71
3.3 Keywords. 74
3.4 Editorial conventions . 75
3.5 UML notation conventions. 76
3.5.1 Notation conventions overview . 76
3.5.2 Constraint and note conventions . 77
3.5.3 Class diagram conventions. 77
3.5.4 Object diagram conventions . 81
3.6 State machine conventions . 83
3.6.1 State machine conventions overview. 83
3.6.2 Transitions . 84
3.6.3 Messages, requests, indications, confirmations, responses, and event notifications. 84
3.6.4 State machine counters, timers, and variables. 84
3.6.5 State machine arguments. 85
3.7 Bit and byte ordering . 85
3.8 Notation for procedures and functions. 85
4 General . 87
4.1 Architecture . 87
4.1.1 Architecture overview. 87
4.1.2 Physical links and phys. 88
4.1.3 Logical links . 93
4.1.4 Narrow ports and wide ports. 93
4.1.5 Application clients and device servers. 96
4.1.6 SAS devices. 97
4.1.7 Expander devices . 98
4.1.8 Service delivery subsystem . 99
4.1.9 Domains. 99
4.1.10 Expander device topologies. 102
4.1.10.1 Expander device topology overview. 102
4.1.10.2 Expander device topologies . 102
4.1.11 Pathways . 104
4.1.12 Connections. 104
4.1.13 Broadcasts. 106
4.2 Names and identifiers. 109
4.2.1 Names and identifiers overview. 109
4.2.2 NAA IEEE Registered format identifier . 109
4.2.3 NAA Locally Assigned format identifier. 110
4.2.4 SAS address. 111
4.2.5 Hashed SAS addresses. 111
4.2.6 Device names and expander device SAS addresses. 112
4.2.7 Device names for SATA devices with world wide names . 112
4.2.8 Port names. 113
4.2.9 Port identifiers and SAS port SAS addresses. 113
4.2.10 Phy identifiers . 114
4.3 State machines. 115
4.3.1 State machine overview. 115

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4.3.2 Transmit data path. 116
4.3.3 Receive data path. 121
4.3.4 State machines and SAS Device, SAS Port, and SAS Phy classes. 125
4.4 Events. 126
4.4.1 Reset sequences . 126
4.4.2 Hard reset . 128
4.4.2.1 Hard reset overview . 128
4.4.2.2 Additional hard reset processing by SAS ports. 128
4.4.2.3 Additional hard reset processing by expander ports . 128
4.4.3 I_T nexus loss. 128
4.4.4 Power loss expected. 129
4.5 Expander device model. 129
4.5.1 Expander device model overview . 129
4.5.2 Expander ports. 131
4.5.3 Expander connection manager (ECM). 131
4.5.4 Expander connection router (ECR). 131
4.5.5 Broadcast propagation processor (BPP) . 132
4.5.6 Expander device interfaces. 132
4.5.6.1 Expander device interface overview. 132
4.5.6.2 Expander device interfaces detail . 134
4.5.6.3 ECM interface. 135
4.5.6.4 ECR interface. 137
4.5.6.5 BPP interface . 138
4.5.7 Expander device routing . 140
4.5.7.1 Routing attributes and routing methods . 140
4.5.7.2 Expander device topology routing attribute restrictions. 140
4.5.7.3 Connection request routing . 141
4.5.7.4 Expander route table. 141
4.5.7.4.1 Expander route table overview . 141
4.5.7.4.2 Phy-based expander route table. 142
4.5.7.4.3 Expander-based expander route table . 143
4.5.8 Expander device reduced functionality . 143
4.5.9 Broadcast (Expander) handling . 144
4.6 Discover process. 144
4.6.1 Discover process overview . 144
4.6.2 Starting the discover process (Broadcast (Change) handling) . 144
4.6.3 Discover process traversal. 144
4.6.4 Discover process in a self-configuring expander device. 146
4.6.5 Enabling multiplexing. 147
4.7 Configuration subprocess. 147
4.7.1 Configuration subprocess overview. 147
4.7.2 Allowed expander device topologies. 148
4.7.3 Externally configurable expander device route table optimization. 149
4.7.4 Externally configurable expander device expander route index order. 150
4.8 Zoning. 157
4.8.1 Zoning overview. 157
4.8.2 Zoning expander device requirements. 161
4.8.3 Zoning operation. 164
4.8.3.1 Zone phy information. 164
4.8.3.2 Zone groups . 166
4.8.3.3 Zone permission table. 166
4.8.3.4 Zoning expander route table . 168
4.8.3.5 Source zone group and destination zone group determination. 169
4.8.4 Zone phy information and link reset sequences . 169
4.8.5 Broadcast processing in a zoning expander device with zoning enabled. 172
4.8.6 Zone configuration . 172
4.8.6.1 Zone configuration overview . 172
4.8.6.2 Lock step. 173

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ISO/IEC 14776-262:2017 © ISO/IEC 2017 – 4 –
4.8.6.3 Load step. 173
4.8.6.4 Activate step. 174
4.8.6.5 Unlock step. 174
4.8.6.6 Zone lock inactivity timer. 175
4.8.6.7 Enable a zoning expander device . 175
4.9 SAS device and expander device power conditions. 176
4.10 Phy power conditions . 176
4.10.1 Low phy power conditions. 176
4.10.1.1 Low phy power conditions overview. 176
4.10.1.2 Active phy power condition. 176
4.10.1.3 Partial phy power condition . 176
4.10.1.4 Slumber phy power condition. 177
4.10.1.5 End device low phy power conditions . 177
4.10.1.6 Expander device low phy power conditions . 177
4.10.2 SATA phy power conditions. 178
4.11 Phy test functions . 178
4.11.1 Phy test functions overview . 178
4.11.2 Transmit pattern phy test function. 179
4.12 Phy events. 179
5 Phy layer . 184
5.1 Phy layer overview . 184
5.2 8b10b coding. 184
5.2.1 8b10b coding overview . 184
5.2.2 8b10b coding notation conventions . 184
5.3 Character encoding and decoding. 185
5.3.1 Introduction . 185
5.3.2 Bit transmission order . 185
5.3.3 Character transmission order. 185
5.3.4 Frame transmission order. 185
5.3.5 Running disparity (RD). 186
5.3.6 Data characters. 186
5.3.7 Control characters. 191
5.3.8 Encoding characters in the transmitter . 192
5.3.9 Decoding characters in the receiver . 193
5.4 Dwords, primitives, data dwords, and invalid dwords. 193
5.5 Bit order. 193
5.6 Out of band (OOB) signals . 195
5.6.1 OOB signals overview. 195
5.6.2 SP Transmission of OOB signals. 195
5.6.3 Receiver detection of OOB signals. 196
5.6.4 SATA port selection signal. 198
5.6.5 Phy power conditions. 199
5.7 Phy capabilities bits. 199
5.8 BMC coding. 203
5.8.1 BMC coding overview . 203
5.8.2 TTIU bit cell encoding in the transmitter . 204
5.8.3 TTIU bit transmission order. 205
5.8.4 TTIU bit cell decoding in the receiver. 205
5.9 Train_Tx-SNW TTIUs. 206
5.9.1 Train_Tx-SNW TTIU format. 206
5.9.2 Control/Status TTIU . 207
5.9.3 Error Response TTIU. 211
5.10 Phy reset sequences. 213
5.10.1 Phy reset sequences overview . 213
5.10.2 SATA phy reset sequence . 214
5.10.2.1 SATA OOB sequence . 214
5.10.2.2 SATA speed negotiation sequence. 215

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5.10.3 SAS to SATA phy reset sequence. 216
5.10.4 SAS to SAS phy reset sequence . 217
5.10.4.1 SAS OOB sequence. 217
5.10.4.2 SAS speed negotiation sequence . 219
5.10.4.2.1 SAS speed negotiation sequence overview . 219
5.10.4.2.2 SAS speed negotiation sequence timing specifications . 219
5.10.4.2.3 Speed negotiation window (SNW) definitions. 221
5.10.4.2.3.1 SNW definitions overview . 221
5.10.4.2.3.2 SNW-1, SNW-2, and Final-SNW. 221
5.10.4.2.3.3 SNW-3. 223
5.10.4.2.3.4 Train_Tx-SNW .
...