SCSI Command Overview
Drive Control Commands
Chapter 1
1-7
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The transfer period is the minimum time allowed between leading edges
of successive REQ pulses and of successive ACK pulses.
The REQ/ACK offset is the maximum number of REQ pulses allowed to
be outstanding before the leading edge of its corresponding ACK pulse is
received at the target. This value prevents overflow conditions in the
device’s reception buffer and offset counter. A REQ/ACK offset value of
zero indicates asynchronous mode.
The initiator sets its values according to the rules above that permit it to
receive data successfully. If the drive can also receive data successfully
with these values (or smaller transfer period or larger REQ/ACK offset
or both), it returns the same values in its SDTR message.
Synchronous Negotiation Started by the Initiator
If the initiator recognizes that negotiation is required, it asserts the ATN
signal and sends a SDTR message to begin the negotiating process. After
successfully completing the MESSAGE OUT phase, the drive will
respond with the proper SDTR message. If an abnormal condition
prevents the drive from returning an appropriate response, both devices
will go to asynchronous mode for data transfers between the two devices.
The drive responds to each initiator requested transfer period as shown
in Table 1-3 on page 1-8.
Summary of Contents for SureStore Optical 2600fx
Page 1: ...optical drive and library SCSI 2 command reference for models fx ex and mx ...
Page 11: ...Contents x ...
Page 20: ...Chapter 1 1 1 SCSI Command Overview 1 SCSI Command Overview ...
Page 38: ...Chapter 2 2 1 Drive Commands SCSI 2 Drive Commands 2 SCSI 2 Drive Command Set ...
Page 187: ...SCSI 2 Drive Command Set Write Long Command DFH Chapter 2 2 150 ...
Page 188: ...Chapter 3 3 1 Jukebox SCSI 2 Commands 3 Jukebox SCSI 2 Command Set ...
Page 264: ...Appendix A A 1 Drive Error Codes A Drive Error Codes ...
Page 287: ...Drive Error Codes DSP Error Codes Appendix A A 24 ...
Page 288: ...Appendix B B 1 Autochanger Error Codes B Autochanger Error Codes ...
Page 339: ...Autochanger Error Codes Jukebox Micro Move Error Codes Appendix B B 52 ...
Page 340: ...Appendix C C 1 Field Replaceable Units C Field Replaceable Units FRUs ...
Page 345: ...Field Replaceable Units FRUs HP Field Replaceable Units FRUs Appendix C C 6 ...
Page 346: ...Appendix D D 1 Micro Macro Moves D Micro Macro Moves ...
Page 369: ...Micro Macro Moves HP Surestore Optical Micro Move IDs Appendix D D 24 ...
Page 370: ...Appendix E E 1 Disconnect Timeouts E Disconnect Timeout Settings ...
Page 373: ...Disconnect Timeout Settings Disconnect Timeout Settings Appendix E E 4 ...
Page 377: ...Index 4 ...