Clock Skew / Asynchronous Clock Support

Hi,

I was wondering if it would be possible to support some kind of skew or multiple-clock diagramming on the same waveform. This is especially useful for diagrams dealing with clock-domain-crossing, or showing off C2Q delays through elements.

Ideally you could specify ratios between the “main” clock and any other clocks. Or you could register a clock as a separate type of signal that any other signals can reference.

Rough example:

{ signal: [
    {clk: 'clkA', wave: 'p......', ratio:1},  // default is 1.0
    {clk: 'clkB', wave: 'p..........', ratio:0.66},  // clock edge distance is 66% of the default clock
    {clk: 'clkC', wave: 'p......', skew: ['clkA', 0.05]},  // +5% skew from clkA
    {clk: 'clkD', wave: 'p......', skew: ['clkA', -0.10]}, // -10% skew from clkA
    {name: 'datB', wave: 'x223223', clk: 'clkB'}, // align to edges of clkB
]}

[itsayellow]

@acarlson1029 I think wavedrom is rounding to 0.5 tick resolution for edge placement, so a bit better than integer. But yes, you can specify floating point, but every edge will end up on the nearest 0.5 tick.

[drom]

@acarlson1029 you are right. Image is constructed from blocks of standard size (bricks), so the period rounded to the brick size. Depend on the scenario certain period ration can be more or less illustrative. {period:1}, {period:3} – fast & slow clock {period:2} {period:3} – similar frequency clocks. {period:2} {period:3, phase:0.25} – similar frequency but unrelated clocks. Never in sync. you can use config: {skin:'narrow'} to compress diagram a bit.