Interface Descriptions
1-5
See
Figure 2.1
for the location of these connectors.
The LSI21002 supplies SCSI bus TERMPWR through a blocking diode
and self-resetting 1.5 A short circuit protection device. An on-board LED
lights up when TERMPWR is shorted and has turned off.
A 40 MHz oscillator is installed on the LSI21002 to provide the clock
frequency to the LSI53C896 that is necessary to support SCSI transfers.
1.3.3 SCSI Activity LED Interface
The LSI21002 LED interface is a four-wire arrangement that allows
connection of an LED harness to the board. The connector on the
LSI21002 is J6 for both channels. See
Table A.7
in
Appendix A
for the
signal name and pin numbers for this LED interface.
1.3.4 Wide Ultra2 SCSI
The LSI21002 has full support for Wide Ultra2 SCSI. This interface is an
extension of the SCSI-3 family of standards that expands the bandwidth
of the SCSI bus to allow faster synchronous data transfers, up to
80 Mbytes/s. Wide Ultra2 SCSI provides a doubling of the data rate over
the Ultra SCSI interface, while it allows increased cable length and more
devices than Ultra SCSI interfaces.
Special SCSI cables are specified for operation with Wide Ultra and
Ultra2 SCSI devices, and you must consider the total number of devices
and the length of your SCSI bus when setting up your system. The
section on connecting your SCSI peripherals in
Chapter 2, "Installing the
LSI21002,"
provides a more detailed explanation of SCSI bus
connections. See
Table 1.1
for maximum bus lengths in meters.
When you purchased the LSI21002 kit, the cable provided in the kit is
matched for a Fast/Ultra/Ultra2 SE or LVD operation. This cable also has
built-in LVD termination since most Ultra2 hard disk drives are not made
with on-board LVD termination.
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