Is it possible for attrs to span multiple bits, such as the offsets are doing in this

Or maybe something even more explicit: <a target="_blank" rel="noopener noreferrer

Attrs spanning multiple bits. about bitfield HOT 2 OPEN

wavedrom commented on August 10, 2024

Attrs spanning multiple bits.

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Comments (2)

drom commented on August 10, 2024

it is not possible right now.
Looks like imm[12] and offset[12] carry the same semantic information in the picture?
Would it make sense to do something like:

{reg: [
    {bits: 7,  name: 'opcode',    attr: 'BRANCH'},
    {bits: 5,  name: 'imm',       attr: 'offset[11|4:1]', type: 3},
    {bits: 3,  name: 'func3',     attr: ['BEQ', 'BNE', 'BLT', 'BLTU', 'BGE', 'BGEU'], type: 4},
    {bits: 5,  name: 'rs1',       attr: 'src1'},
    {bits: 5,  name: 'rs2',       attr: 'src2'},
    {bits: 7,  name: 'imm',       attr: 'offset[12|10:5]', type: 3}
]}

more examples: https://observablehq.com/@drom/wavedrom-bit-field-guide?collection=@drom/bitfield

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drom commented on August 10, 2024

Or maybe something even more explicit:

{reg: [
    {bits: 7,  name: 'opcode',    attr: 'BRANCH'},
    {bits: 1,  name: '[11]', type: 3},
    {bits: 1,  name: '[1]', type: 3},
    {bits: 1,  name: '[2]', type: 3},
    {bits: 1,  name: '[3]', type: 3},
    {bits: 1,  name: '[4]', type: 3},
    {bits: 3,  name: 'func3',     attr: ['BEQ', 'BNE', 'BLT', 'BLTU', 'BGE', 'BGEU'], type: 4},
    {bits: 5,  name: 'rs1',       attr: 'src1'},
    {bits: 5,  name: 'rs2',       attr: 'src2'},
    {bits: 1,  name: '[5]', type: 3},
    {bits: 1,  name: '[6]', type: 3},
    {bits: 1,  name: '[7]', type: 3},
    {bits: 1,  name: '[8]', type: 3},
    {bits: 1,  name: '[9]', type: 3},
    {bits: 1,  name: '[10]', type: 3},
    {bits: 1,  name: '[12]', type: 3}
]}

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