Overview - Motorola MVME2600 Series Reference Manual

A byte is eight bits, numbered 0 through 7, with bit 0 being the least
significant.
A half-word is 16 bits, numbered 0 through 15, with bit 0 being the
least significant.
A word or single word is 32 bits, numbered 0 through 31, with bit 0
being the least significant.
A double word is 64 bits, numbered 0 through 63, with bit 0 being
the least significant.
Refer to Chapter 5 for Endian Issues, which covers which parts of the
MVME2600/2700 series use big-endian byte ordering, and which use
small-endian byte ordering.
The terms control bit and status bit are used extensively in this document.
The term control bit is used to describe a bit in a register that can be set and
cleared under software control. The term true is used to indicate that a bit
is in the state that enables the function it controls. The term false is used to
indicate that the bit is in the state that disables the function it controls. In
all tables, the terms 0 and 1 are used to describe the actual value that should
be written to the bit, or the value that it yields when read. The term status
bit is used to describe a bit in a register that reflects a specific condition.
The status bit can be read by software to determine operational or
exception conditions.

Overview

The MVME2600/2700 series SBC families provide many standard
features required by a computer system: SCSI, Ethernet interface,
keyboard interface, mouse interface, sync and async serial ports, parallel
port, boot Flash, and up to 256MB of ECC DRAM.
Overview
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