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Barracuda 36 Installation Guide, Rev. B 23
ground (see Figure 12). The host device cannot override the
SE jumper. If “DIFFSNS” is at nominal ground (0V to .6V), all
of the bus receivers/drivers operate in single-ended mode. If
“DIFFSNS” is between .7V and 1.9V, all bus receiver/drivers
operate in low voltage differential (LVD) mode.
•“LC” and “LW” models have a “wide” (16-bit) SCSI data bus
rather than the standard (non-wide) 8-bit SCSI data bus; how-
ever, you can use these wide drives on a standard (non-wide)
8-bit data bus. However, the unused lines must be terminated
the same as the used lines.
Figures 3a and 3b show typical drive connections. The following
tables list the maximum cable lengths and number of devices
allowed on a daisy-chain cable for I/O data transfer rates shown.
Note. For LVD operation, twisted pair cables are recom-
mended. For LVD Fast-40 operation, twisted pair cables
are
strongly
recommended. For Fast-80 operation,
twisted pair cables are
required
.