Motorola MVME712A/D3 Manuel d'utilisateur télécharger pdf (Page 31)

Manual Terminology

MVME167BUG/D3 1-19

Versatile Backplane Bus: VMEbus, ANSI/IEEE Std 1014-1987, The Institute of

Electrical and Electronics Engineers, Inc., 345 East 47th Street, New York, NY

10017 (VMEbus Specification). This is also available as Microprocessor system

bus for 1 to 4 byte data, IEC 821 BUS, Bureau Central de la Commission

Electrotechnique Internationale; 3, rue de VarembŽ, Geneva, Switzerland.

Manual Terminology

Throughout this manual, a convention has been maintained whereby data and

address parameters are preceded by a character which specifies the numeric

format as follows:

Unless otherwise specified, all address references are in hexadecimal

throughout this manual.

An asterisk (*) following the signal name for signals which are level significant

denotes that the signal is true or valid when the signal is low.

An asterisk (*) following the signal name for signals which are edge significant

denotes that the actions initiated by that signal occur on high to low transition.

In this manual, assertion and negation are used to specify forcing a signal to a

particular state. In particular, assertion and assert refer to a signal that is active

or true; negation and negate indicate a signal that is inactive or false. These terms

are used independently of the voltage level (high or low) that they represent.

Data and address sizes are defined as follows:

❏ A byte is eight bits, numbered 0 through 7, with bit 0 being the least

significant.

❏ A word is 16 bits, numbered 0 through 15, with bit 0 being the least

significant.

❏ A longword is 32 bits, numbered 0 through 31, with bit 0 being the least

significant.

$ dollar speciÞes a hexadecimal character

% percent speciÞes a binary number

& ampersand speciÞes a decimal number

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 238 239

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Motorola MVME712A/D3 Manuel d'utilisateur Page 31