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Rangeset - ARM Machine Readable Schema - 2.8

AARCHMRS Schema 2.8

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Rangeset array

The Rangeset schema contains an array of Range objects which allow us to reference multiple bits in a bitstring (or binary number).

For example to reference the set bits in an 8-bit number '01001110', you can use two Range objects, where the first Range object references 1-bit at position 6 (most significant bit), and the next Range object references 3-bits at position 4:2. See Range object for more details on a single bit reference.

Note

The order is important, because referencing 4:2, 6 returns a different answer!

For example 'abcdefgh' represent a bitstring where the characters represent the position. Where:

6, 4:2 returns the bits in the order of 'bdef'.
4:2, 6 returns the bits in the order of 'defb'.
2, 3, 4, 6 returns the bits in the order of 'fedb'.

array

oneOf Range
oneOf ExpressionRange

Examples

[
    {
        "_type": "Range", 
        "start": 6, 
        "width": 1
    }, 
    {
        "_type": "Range", 
        "start": 2, 
        "width": 3
    }
]

Schema http://json-schema.org/draft-04/schema#

{
  "title": "Rangeset",
  "$schema": "http://json-schema.org/draft-04/schema#",
  "type": "array",
  "info": [
    [
      "The $(Rangeset) schema contains an array of $(Range) objects which allow us to reference",
      "multiple bits in a bitstring (or binary number)."
    ],
    [
      "For example to reference the set bits in an 8-bit number `'01001110'`, you can use two ",
      "$(Range) objects, where the first $(Range) object references 1-bit at position `6` ",
      "(most significant bit), and the next $(Range) object references 3-bits at position ",
      "`4:2`. See $(Range) object for more details on a single bit reference."
    ],
    [
      "!!! note",
      "    The order is important, because referencing `4:2, 6` returns a different answer!",
      "    ",
      "    For example `'abcdefgh'` represent a bitstring where the characters represent ",
      "    the position. Where:",
      "    ",
      "      - `6, 4:2` returns the bits in the order of `'bdef'`.",
      "      - `4:2, 6` returns the bits in the order of `'defb'`.",
      "      - `2, 3, 4, 6` returns the bits in the order of `'fedb'`."
    ]
  ],
  "items": {
    "oneOf": [
      {
        "$ref": "Range.json"
      },
      {
        "$ref": "ExpressionRange.json"
      }
    ]
  },
  "examples": [
    [
      {
        "_type": "Range",
        "start": 6,
        "width": 1
      },
      {
        "_type": "Range",
        "start": 2,
        "width": 3
      }
    ]
  ],
  "additionalItems": false
}