SCSI BUS
Deskew Delay ⋅ | 2 (Min) | Deskew Delay | ||
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Figure 7.19 ATTENTION condition
The ATTENTION condition generated by the INIT in the SELECTION phase determines the message level to be used in the command execution sequence. (Details are explained in Subsection
5.1.3.of “MCD3130SS, MCE3130SS, MCK3130SS, MCM3064SS,
MCM3130SS OPTICAL DISK DRIVES SCSI LOGICAL INTERFACE SPECIFICATIONS.”) If the ATTENTION condition is not generated in the SELECTION phase, the TARG uses a COMMAND COMPLETE message only. The TARG does not respond to the ATTENTION condition even if it was generated in the subsequent bus phase. Therefore, the TARG does not enter the MESSAGE OUT phase.
7.7.2RESET condition
The RESET condition allows all SCSI devices to immediately release the bus. RESET has higher priority than any other phases and bus conditions. Any SCSI device can generate the RESET condition at any time by keeping the RST signal true for 25 ∝ s (Reset Hold Time) or more. The state of all bus signals except RST signals are undefined during the RESET condition.
