Compatibility
2.5 COMPATIBILITY
The following subsections discuss compatibility of the MD21
Controller with specific ESDI disk drives and SCSI host adapter
systems and related microcontrollers. For more information about
SCSI programming, refer to the Emulex SCSI Disk Controller
Programming Reference Manual (part number MD2352501-00, Rev C).
2.5.1 SCSI BUS HARDWARE COMPATIBILITY
A disk drive that is connected to the SCSI bus, and that follows
the protocol outlined in the ANSI SCSI Specification, is compatible
with the MD21 Controller/disk drive unit. A standard 50-pin male
connector, reference designated J6, plugs directly into the SCSI
bus cable.
The MD21 Controller supports the SCSI bus single-ended option. The
overall length of the cable that connects the SCSI host adapters
and controllers in a daisy-chained manner can extend to 6 meters
(20 feet). All SCSI bus signals in the cable are terminated at
each end by terminating resistors of 220 ohms to +5 VDC, and 330
ohms to ground.
Terminators are optionally installed, depending on
the physical profile of the SCSI bus.
For example, if the host
adapter is terminated and no other device except the MD21 is on the
SCSI bus, or the MD21 is replacing the last device on the SCSI bus,
terminators would be installed in the MD21.
The MD21 Controller
complies with the FCC limits for a Class B computing device (see
subsection 5 .6 ).
2.5.2 ESDI DISK DRIVE COMPATIBILITY
The MD21 Controller connects one or two ESDI 5.25-inch magnetic
disk drives via one 34-pin control connector, designated Jl, and
one or two 20-pin data connectors, designated J2 and J3.
The MD21 supports ESDI disk drives that have clocks up to 15
megahertz.
It supports hard-sectored, soft-sectored, and embedded
servo disk drives.
See Section 4.2.5 for drives that are supported by the Emulex ESDI-
to-SCSI disk controllers.
General Description 2-9
Summary of Contents for MD21/S2
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