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24
can use these wide drives on a standard (non-wide) 8-bit data
bus if you provide proper termination to the upper 8-bit data
lines. This is often referred to as providing "high-9 termina-
tion."
Figures 3, 4, and 5 show typical drive connections.
The following table lists the maximum cable lengths and number
of devices using single-ended and LVD I/O circuits allowed on a
daisy-chain cable for 10, 20, and 40 Mtransfers/sec I/O data
transfer rates.
Table 1.
Cable characteristics for SE and LVD circuits
SCSI
driver
I/O transfer rate
type
(Mtransfers/s)
SE
10
SE
20
SE
20
LVD
40
A maximum of 16 devices can be connected on a 16-bit wide
data bus.
Cheetah 18 Installation Guide, Rev. A
Maximum
number of
devices on
bus
16
4
8
16
Maximum cable
length allowed
6 meters (19.7 ft.)
3 meters (9.8 ft.)
1.5 meters (4.9 ft.)
12 meters (39.4 ft.)
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