Modelica.Electrical.Digital

Library for digital electrical components based on the VHDL standard with 9-valued logic and conversion to 2-,3-,4-valued logic

Information

This library contains packages for digital electrical components. Both, type system and models are based on the VHDL standard (IEEE Std 1076-1987 VHDL, IEEE Std 1076-1993 VHDL, IEEE Std 1164 Multivalue Logic System):

Interfaces: Definition of signals and interfaces
Tables: All truth tables needed
Delay: Transport and inertial delay
Basic: Basic logic without delay
Gates: Basic gates composed by basic components and inertial delay
Tristate: (not yet available)
FlipFlops: (not yet available)
Latches: (not yet available)
TransferGates: (not yet available)
Multiplexers (not yet available)
Memory: Ram, Rom, (not yet available)
Sources: Time-dependend signal sources
Converters
Examples

The logic values are coded by integer values. The following code table is necessary for both setting of input and interpreting the output values.

Code Table:

Logic value	Integer code	Meaning
'U'	1	Uninitialized
'X'	2	Forcing Unknown
'0'	3	Forcing 0
'1'	4	Forcing 1
'Z'	5	High Impedance
'W'	6	Weak Unknown
'L'	7	Weak 0
'H'	8	Weak 1
'-'	9	Don't care

The library will be developed in two main steps. The first step contains the basic components and the gates. In the next step the more complicated devices will be added. Currently the first step of the library is implemented and released for public use.

This Modelica package is free software; it can be redistributed and/or modified under the terms of the Modelica license, see the license conditions and the accompanying disclaimer here.

Package Content

Name Description

UsersGuide User's Guide

Examples Examples that demonstrate the usage of the Digital electrical components

Interfaces Connectors for Digital electrical components

Tables Truth tables for all components of package Digital

Delay Transport and inertial delay blocks

Basic Basic logic blocks without delays

Gates Logic gates including delays

Sources Time-dependend digital signal sources

Converters Converters between 2-,3-,4- and 9-valued logic

Name	Description
UsersGuide	User's Guide
Examples	Examples that demonstrate the usage of the Digital electrical components
Interfaces	Connectors for Digital electrical components
Tables	Truth tables for all components of package Digital
Delay	Transport and inertial delay blocks
Basic	Basic logic blocks without delays
Gates	Logic gates including delays
Sources	Time-dependend digital signal sources
Converters	Converters between 2-,3-,4- and 9-valued logic

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