Motorola MVME187 manual Assertion and Negation Conventions, Data and Address Size Definitions

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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