Description
Crosswalk a bit index between least/most-significant numbering.
Bit positions are usually counted from the least-significant bit, while a displayed binary string has its own left-to-right indexing convention. Masks, fields and parity predicates describe a selected region or pattern; local agreement does not validate a complete encoded record.
Crosswalk a bit index between least/most-significant numbering.
When to use this tool
Use Bitword Lsb Msb Index Crosswalk when checking the stated mask, field, parity or bit-index convention.
How to use the tool and how it works
- Enter width, index. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read oppositeIndex. Use the output convention below.
Crosswalk a bit index between least/most-significant numbering. Require width 1..128 and index in [0,width); oppositeIndex = width-1-index.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| width | Width under the stated bit, interval or geometry convention; apply the field-specific units and bounds. | Required. Safe integer; minimum 1; maximum 128. |
| index | Position under the explicit indexing convention; inspect any missing-value sentinel. | Required. Safe integer; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| oppositeIndex | Opposite Index | Required. Safe integer. |
{
"input": {
"width": 8,
"index": 2
},
"output": {
"oppositeIndex": 5
}
}Limitations and assumptions
- This changes the index convention without moving bits or reversing byte order.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Choose an explicit bit order, word width and missing-position policy; use the complete record format and appropriate parsing or checksum methods for full validation.
References
Similar or alternative tools
- Bitword Extract One Packed Bit
Extract one packed bit as a Boolean.
- Bitword Partial Byte Validbit Mask
Return full bytes and a final partial-byte mask from a bit count.