![background image](http://html2.mh-extra.com/html/quantum/dlttape-dlt-8000/dlttape-dlt-8000_product-manual_3551923111.webp)
SCSI Description
Quantum DLT 8000 Tape System
3-9
Table 3–4 SCSI Bus Timing Values (continued)
Timing Description
Value
Description
Bus Settle Delay
400 ns
Minimum time to wait for the bus to settle after
changing certain control signals as called out in the
protocol definitions
.
Cable Skew Delay
10 ns
Maximum difference in propagation time allowed
between any two SCSI bus signals measured between
any two SCSI devices.
Data Release Delay
400 ns
Maximum time for an initiator to release the DATA BUS
signals following the transition of the I/O signal from
false to true.
Deskew Delay
45 ns
Minimum time required to wait for all signals (especially
data signals) to stabilize at their correct, final value after
changing.
Disconnection Delay
200 µs
Minimum time that a drive waits after releasing BSY
before participating in an ARBITRATION when honoring a
DISCONNECT message from the initiator.
Hold Time
45 ns
Minimum time added between the assertion of REQ or
ACK and changing the data lines to provide hold time in
the initiator or drive while using standard (slow)
synchronous data transfers.
Negation Period
90 ns
Minimum time that a drive negates REQ while using
synchronous data transfers; also, the minimum time than
an initiator negates ACK while using synchronous data
transfers.1
Power-On to Selection
10 s1
Recommended maximum time from power application
until a drive is able to respond with appropriate status
and sense data to the TEST UNIT READY, INQUIRY, and
REQUEST SENSE commands.
Reset to Selection
Time
250
ms1
Recommended maximum time after a hard RESET
condition until a drive is able to respond with
appropriate status and sense data to the TEST UNIT
READY, INQUIRY, and REQUEST SENSE commands.
Reset Hold Time
25 µs
Minimum time for which RST is asserted; there is no
maximum time.
Selection Abort Time
200 µs
Maximum time that a drive (or initiator) takes from its
most recent detection of being selected (or reselected)
until asserting a BSY response.
Selection Time-out
Delay
250
ms1
Recommended minimum time a SCSI device should wait
for a BSY response during SELECTION or RESELECTION
before starting the time-out procedure.
1 Recommended Time.
Summary of Contents for DLTtape DLT 8000
Page 1: ...DLTTM 8000 Tape System Product Manual Nov 10 2003 81 60118 06...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued...
Page 6: ......
Page 26: ...Table of Contents xxiv Quantum DLT 8000 Tape System...
Page 36: ...About This Manual Quantum DLT 8000 Tape System xxxii...
Page 54: ...General Description and Specifications 1 18 Quantum DLT 8000 Tape System...
Page 102: ......
Page 372: ......
Page 376: ...Appendix A Definition of Vendor Unique Sense Data Information A 4 Quantum DLT 8000 Tape System...
Page 386: ...Appendix C Updating the Firmware C 6 Quantum DLT 8000 Tape System...
Page 396: ...Appendix E Visual Inspection Procedure for DLTtape Cartridges E 8 Quantum DLT 8000 Tape System...
Page 406: ...Appendix G DLT 7000 Emulation Feature G 8 Quantum DLT 8000 Tape System...
Page 407: ......