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Clock configuration for ShiftRegister in ChiselUtil

ShiftRegister is a usefull function to synchronize external signal with the main clock with two flip-flop : 

sync_signal := ShiftRegister(ext_signal, 2)

That work well in this case. But is there a way to use it with an other clock like this : 

slowClk = Clock(reset=Driver.implicitReset)
sync_signal := ShiftRegister(ext_signal, 2, clock=slowClk)

?

Solution

  • With Chisel3 it's now possible using withClock(){}

    We just have to surround ShiftRegister() call with withClock : 

      withClock(clock) {
    led := ShiftRegister(blinkled, 4)
  }

    See also multiple clocks domains chapter in Chisel3 wiki.