Package Contents

	UsersGuide User's Guide
	Examples Examples that demonstrate the usage of the Digital electrical components
	Interfaces Basic definitions
	Tables Truth tables for all components of package Digital
	Delay Delay blocks
	Basic Basic logic blocks without delays
	Gates Logic gates including delays
	Sources Time-dependent digital signal sources
	Converters Converters between 2-,3-,4- and 9-valued logic
	Registers Registers with N-bit input data and output data
	Tristates Transfergates, Buffers, Inverters, and WiredX
	Memories
	Multiplexers

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

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: D-Flip-Flops
Latches: D-Latches
TransferGates: (not yet available)
Multiplexers (not yet available)
Memory: Ram, Rom, (not yet available)
Sources: Time-dependent 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	Do not 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.