Don't-Care X Cell Count Flexibility Note Generator
Count explicitly supplied dont-care cells and 2^X independent assignments; no minimization or arbitrary hardware validity.
Description
Don't-Care X Cell Count Flexibility Note Generator: return dont care count, possible assignments decimal, logic minimized.
A don't-care cell permits either Boolean assignment when the surrounding design allows it. With n independent don't-care cells there are 2^n assignments.
This tool returns dont care count, possible assignments decimal, logic minimized. Use the stated units and model convention when interpreting these fields.
When to use this tool
Use this tool when the supplied inputs match the specific operation described above and you need a repeatable result under its stated convention.
- Check the supported input and output contract against an existing calculation or observation.
- Use the complete example to confirm units, selector spelling and result interpretation.
How to use the tool and how it works
- Enter every field in the input table using the stated units and the exact supported selector spelling where applicable.
- Run the tool. Correct input errors before interpreting an output.
- Read the result fields below; use accompanying flags and the stated sign, boundary or model convention when interpreting a number.
Require each state to be 0, 1 or X. Count the X entries and calculate 2^count with a big-integer shift, returning its exact decimal string.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| cellStates | Cell states. | List of text values |
| Output field | Interpretation |
|---|---|
| result | Object containing the following named result fields. |
| result.dontCareCount | Dont care count; use the stated units and sign convention. |
| result.possibleAssignmentsDecimal | Possible assignments decimal; use the stated units and sign convention. |
| result.logicMinimized | Always false; no minimization is performed. |
{
"input": {
"cellStates": [
"0",
"X",
"1",
"X"
]
},
"output": {
"result": {
"dontCareCount": 2,
"possibleAssignmentsDecimal": "4",
"logicMinimized": false
}
}
}Limitations and assumptions
- logicMinimized is false. The tool does not verify that a cell can safely be treated as a don't-care.
- Every declared field is required and unexpected fields are rejected. Numeric inputs must be finite; input errors are distinct from a valid false result or an explicitly qualified output.
- Extremely large inputs and nonfinite or excessively large outputs are rejected. List positions reported by the tool use zero-based indices unless stated otherwise.
Alternative or Complementary methods
Check the underlying observations, units and conventions independently before using the result in a larger workflow. The tools listed below address nearby tasks; compare their inputs and scope before substituting one for this operation.
References
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