Method: HDLRuby::High::Std#make_2edge_clock

Defined in:
lib/HDLRuby/std/clocks.rb

#make_2edge_clock(event, times) ⇒ Object

Creates a clock inverted every +times+ occurence of an +event+ and its everted.



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# File 'lib/HDLRuby/std/clocks.rb', line 119

def make_2edge_clock(event,times)
    clock = nil # The resulting clock

    # Enters the current system
    HDLRuby::High.cur_system.open do
        # Ensure times is a value.
        times = times.to_value 
        if (times == 1) then
          AnyError.new("Clock multiplier must be >= 2.") 
        end

        # Create the event counter.
        # Create the name of the counter.
        name = HDLRuby.uniq_name
        # Declare the counter.
        if @@__clocks_rst then
            # There is a reset, so no need to initialize.
            [times.width].inner(name)
        else
            # There is no reset, so need to initialize.
            [times.width].inner(name => 0)
        end
        # Get the signal of the counter.
        counter = get_inner(name)

        # Create the inverted event counter.
        # Create the name of the counter.
        name = HDLRuby.uniq_name
        # Declare the counter.
        if @@__clocks_rst then
            # There is a reset, so no need to initialize.
            [times.width].inner(name)
        else
            # There is no reset, so need to initialize.
          [times.width].inner(name => 0)
        end
        # Get the signal of the counter.
        counter_inv = get_inner(name)

        # Create the clock.
        # Create the name of the clock.
        name = HDLRuby.uniq_name
        # Declare the clock.
        if @@__clocks_rst then
            # There is a reset, so no need to initialize.
            bit.inner(name)
        else
            # There is no reset, so need to initialize.
            bit.inner(name => 0)
        end
        # Get the signal of the clock.
        clock = get_inner(name)

        # Control the even counter.
        par(event) do
            if @@__clocks_rst then
                hif(@@__clocks_rst)        { counter <= 0 }
                helsif(counter == times-1) { counter <= 0 }
                helse                      { counter <= counter + 1 }
            else
                hif(counter == times-1)     { counter <= 0 }
                helse                      { counter <= counter + 1 }
            end
        end

        # Control the odd counter.
        par(event.invert) do
            if @@__clocks_rst then
                hif(@@__clocks_rst)        { counter_inv <= 0 }
                helsif(counter == times-1) { counter_inv <= 0 }
                helse                      { counter_inv <= counter_inv + 1 }
            else
                hif(counter == times-1)     { counter_inv <= 0 }
                helse                      { counter_inv <= counter_inv + 1 }
            end
        end

        clock <= ((counter > (times/2)) | (counter_inv > (times/2)))
    end
    # Return the clock.
    return clock
end