Terminology, Conventions, and Definitions Used in this Manual

Assertion and Negation Conventions

Assertion and negation are used to specify forcing a signal to a particular state. These terms are used independently of the voltage level (high or low) that they represent.

Term

Indicates

 

 

Assertion and assert

The signal is active or true.

 

 

Negation and negate

The signal is inactive or false.

 

 

Data and Address Size Definitions

Data and address sizes are defined as follows:

Name

Size

Numbered

SigniÞcance

Called

 

 

 

 

 

 

 

 

bit 0 is the

 

Byte

8 bits

0 through 7

least

 

 

 

 

signiÞcant

 

 

 

 

 

 

 

 

 

bit 0 is the

half-

Two-byte

16 bits

0 through 15

least

word

 

 

 

signiÞcant

 

 

 

 

 

 

 

 

 

 

 

 

bit 0 is the

 

Four-byte

32 bits

0 through 31

least

word

 

 

 

signiÞcant

 

 

 

 

 

 

Big-Endian Byte Ordering

This manual assumes that the MPU on the MVME187 always programs the CMMUs with big-endian byte ordering, as shown below. Any attempt to use little-endian byte ordering will immediately render the MVME187Bug debugger unusable.

BIT

 

 

 

 

 

 

BIT

31

24

23

16

15

08

07

00

 

 

 

 

 

 

 

 

ADR0

 

ADR1

 

ADR2

 

 

ADR3

 

 

 

 

 

 

 

 

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Motorola MVME187 manual Assertion and Negation Conventions, Data and Address Size Definitions, Big-Endian Byte Ordering