6.14.1DIFFSENS
The DIFFSENS signal in the SCSI bus defines the current operating mode of the SCSI bus. A level below +.5 volts defines a
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The Maxtor Atlas 10K V disk drive is designed with a circuit that monitors the level of DIFFSENS at
The two normal operating environments for the Maxtor Atlas 10K V disk drive are an
HVD mode is not supported by the Maxtor Atlas 10K V disk drive. Signal levels on an HVD bus can reach as high as +15 volts due to allowed common mode transients.
CAUTION: The LVD and HVD alternatives are mutually exclusive and damage may occur to SCSI devices if an LVD device is plugged into an operating HVD bus.
6.14.2DIFFSENS SWITCHING
After establishing its initial operating mode, the Maxtor Atlas 10K V disk drive continues to monitor the DIFFSENS signal. If a change in level is detected, such as might occur if a device is added to or removed from the bus, the DIFFSENS circuit detects the change and presents a mode change interrupt to the drive firmware. The operating mode of the interface switches to the new mode 100 msec after the change is detected, providing the new level has remained constant. This delay is required to prevent spurious mode switches due to noise on the DIFFSENS line.
Maxtor Atlas 10K V