Avago Technologies LSI21040 - Manual (Page 24)

3.75 pc 10.25 pc 11.25 pc 38.25 pc
4.333 pc
48.583 pc
52.5 pc
34.5 pc
44.25 pc
2-6 Installing the LSI21040
2.2.3 Connecting the SCSI Peripherals
All internal SCSI bus connections to the LSI21040 are made with an
unshielded 68 conductor Ultra SCSI TPE ribbon cable (see
Figure 2.3 )
and also a 50-pin ribbon cable. The lead connected to pin 1 on the cable
is marked with a colored stripe. The connectors on this cable may also
be keyed to ensure proper pin connection.
All external SCSI bus connections to the LSI21040 are made with high
quality shielded 68 conductor cables (see
Figure 2.3 ). The connectors on
this cable are always keyed to ensure proper pin connection.
Note: All the cables shown in Figure 2.3 are included in the
LSI Logic Adapter Board Kit for the LSI21040.
Table 2.1 provides a list of the SCSI bus width and maximum data
transfer rate for various SCSI definitions.
You can connect up to eight SCSI, Fast SCSI, and Ultra SCSI devices
on an SE Ultra SCSI bus only if they are evenly spaced on a 1.5-meter
Ultra SCSI cable (0.19 m between devices).
Table 2.1 SCSI Bus Widths and Speeds
STA Terms
SCSI Bus
Width, Bits
SCSI Bus Speed
Maximum Data Rate,
Mbytes/s
SCSI-1 8 5
Fast SCSI 8 10
Fast Wide SCSI 16 20
Ultra SCSI 8 20
Wide Ultra SCSI 16 40
Wide Ultra2 SCSI 16 80
Ultra160 SCSI 16 160