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
Digital Sources
Time-dependent digital signal sources
See Also
Electrical Library Overview
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