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Parallel SCSI Interface
Ultra 160
Ultra 320
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Parallel SCSI Interface Ultra 160 Ultra 320
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©2006, Seagate Technology LLC All rights reserved Publication number: 100293069, Rev. A March 2006 Seagate and Seagate Technology are registered trademarks of Seagate Technology LLC. SeaTools, SeaFONE, SeaBOARD, SeaTDD, and the Wave logo are either registered trade- marks or trademarks of Seagate Technology LLC. Other product names are registered trade- marks or trademarks of their owners. Seagate reserves the right to change, without notice, product offerings or specifications. No part of
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Revision status summary sheet Revision Date Writer/Engineer Sheets Affected Rev. A 03/27/06 C. Chalupa/G. Houlder All. Parallel SCSI Interface Product Manual, Rev. A iii
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iv Parallel SCSI Interface Product Manual, Rev. A
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Table of Contents 1.0 Interface requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 How to use this interface manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.1 Scope of SCSI standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1.2 Applicable standards. . . . . . . . . . . . . . . .
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2.5.35 Receive setup time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 2.5.36 Receive REQ(ACK) period tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 2.5.37 Receive REQ assertion period with P_CRCA transitioning. . . . . . . . . . . . . . . . . . . . . . . . . 30 2.5.38 Receive REQ negation period with P_CRCA transitioning . . . . . . . . . . . . . . . . . . . . . . . . . 30 2.5.39
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2.12.8.3QAS_REQ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 2.12.8.4HOLD_MCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 2.12.8.5WR_FLOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 2.12.8.6RD_STRM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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3.7.1 DATA phase overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 3.7.2 DT DATA IN phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 3.7.3 DT DATA OUT phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 3.7.4 ST DATA IN phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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4.3.16 SYNCHRONOUS DATA TRANSFER REQUEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 4.3.16.1Target initiated SDTR negotiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 4.3.16.2Initiator initiated SDTR negotiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 4.3.17 TASK COMPLETE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 4.3.18 WI
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7.3.1 Status precedence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139 7.4 Command examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 7.4.1 Single command example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 7.4.2 Disconnect example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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List of Figures Figure 1. SCSI client-server model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 2. Voltage and current definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 3. LVD Signaling sense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 4. ST latching data vs. DT latching data . . . . . .
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xii Parallel SCSI Interface Product Manual, Rev. A
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1.0 Interface requirements 1.1 How to use this interface manual This manual provides a description of the SCSI1 interface protocol and some general timing information as implemented by Seagate products. The features described in this manual are typically referred to as “Ultra160 SCSI” or “Ultra320 SCSI” features. Individual drive’s Product Manual, for the various SCSI interface products, contains additional and more detailed information on protocol, features supported, timing, and electrical/
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1.1.1 Scope of SCSI standards Figure 1 uses a representative set of specifications to show the functional partitions and the relationships among SCSI standards applicable to drives covered by this manual. SCSI Block Commands (SBC) Commands SCSI Primary Commands (SPC) SCSI SCSI Protocols Interlocked Fibre Channel Protocol Protocol (FCP) and SCSI Fibre Channel Parallel Physical and Signaling Interconnects Interface (SPI-3) Interface (FC-PH) 1 Figure 1. Functional scope of SCSI standards The funct
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1.1.2 Applicable standards The following ANSI standards should be referenced for more details about SCSI system standards of opera- tion: • SCSI Architecture Model - 4 (SAM-4), T10/1683-D • SCSI Enclosure Services - 2 (SES-2), T10/1559-D • SCSI Block Commands - 3 (SBC-3), T10/1215-D • SCSI Primary Commands - 4 (SPC-4), T10/1731-D • SCSI Enhanced Parallel Interface (EPI), T10/1143-DT • SCSI Parallel Interface (SPI-5), T10/1525D • SCSI Medium Changer Commands - 3 (SMC-3), T10/1730-D • SCSI Contro
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Logical Unit Device Service Request Application Device Client Device Service Response Server Task Management Request Task Task Management Response Manager Initiator Target Figure 2. SCSI client-server model 1.2.1 Glossary aborted command—A SCSI command that has been ended by aborting the task created to execute it. ACA—Auto Contingent Allegiance (see below). additional sense code—a combination of the ADDITIONAL SENSE CODE and ADDITONAL SENSE CODE QUALIFIER in the sense data (see SPC-4) applicat
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command descriptor block—A structure used to communicate a command from an application client to a device server. Command structures of 6, 10, 12, or 16 bytes are used, but a new variable length command structure has recently been introduced. completed command—A command that has ended by returning a status and service response of Task Com- plete or Linked Command Complete. completed task—A task that has ended by returning a status and service response of Task Complete. The actual events compr
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double transition (DT)—The latching of data on both the assertion edge and the negated edge of the REQ or ACK signals. driver—The circuitry used to control the state of the bus. enabled task state—The state of a task that may complete at any time. Alternatively, the state of a task that is waiting to receive the next command in a series of linked commands. ended command—A command that has completed or aborted. exception condition—Any event that causes a SCSI device to enter an auto contingent
