Electrical Digital Components Overview - MapleSim Help

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Electrical Digital Components Overview

This library contains electrical digital components based on the VHDL standard with 9-valued logic and conversion to 2-valued logic.

Digital signals are usually considered to be discrete values such as logic 1 or 0; however, the drive strength (none, weak, or strong) and unknown values of a signal may also be considered.

The following table gives the integer values used by MapleSim for each of the nine states.  When a digital signal is plotted, the y-axis corresponds to these integer codes. For example, a digital signal that steps from a forcing 0 to a forcing 1 has a plot that steps from 3 to 4.

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  

Digital Converters and Gates

Type

Description

Digital Converters

Converters between 2- and 9-valued logic

Delay Components

Components with delays

Gates With Delay

Standard logic gates with delays

Ideal Gates

Standard logic gates without delays

Sources

Type

Description

Digital Sources

Time-dependent digital signal sources

See Also

Electrical Library Overview