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SCSI Description
3-8
Quantum DLT 8000 Tape System
Table 3–3 SCSI-2 Bus Signal Definitions (continued)
Signal
Definition
RST (reset)
An OR-tied signal that initiates a RESET condition.
SEL (select)
An OR-tied signal used by an initiator to select a target or by a
target to reselect an initiator.
3.4.2 Signal Bus Timing
The ANSI SCSI-2 standard defines the SCSI bus timing values shown in Table 3–4.
Table 3–4 SCSI Bus Timing Values
Timing Description
Value
Description
Arbitration Delay
2.4 µs
Minimum time a SCSI device waits from asserting BSY
for arbitration until the DATA BUS can be examined to
see if arbitration has been won; there is no maximum
time.
Assertion Period
90 ns
Minimum time a drive asserts REQ while using
synchronous data transfers; also, the minimum time that
an initiator asserts ACK while using synchronous data
transfers.
Bus Clear Delay
800 ns
Maximum time for a SCSI device to stop driving all bus
signals after:
1. BUS FREE is detected.
2. SEL is received from another SCSI device during
ARBITRATION.
3. Transition of RST to true.
For condition 1, the maximum time for a SCSI device to
clear the bus is 1200 ns (1.2
µ
s) from BSY and SEL first
becoming both false.
If a SCSI device requires more than a bus settle delay to
detect BUS FREE, it clears the bus within a bus clear
delay minus the excess time.
Bus Free Delay
800 ns
Maximum time a SCSI device waits from its detection of
BUS FREE until its assertion of BSY when going to
ARBITRATION.
Bus Set Delay
1.8 µs
Maximum time for a device to assert BSY and its SCSI ID
bit on the DATA BUS after it detects BUS FREE to enter
ARBITRATION.
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...
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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...
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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...
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