Class: HDLRuby::High::SignalI

Inherits:
Low::SignalI show all
Includes:
HRef
Defined in:
lib/HDLRuby/hruby_high.rb

Overview

Describes a high-level signal.

Constant Summary collapse

High = 
HDLRuby::High
DIRS =

The valid bounding directions.

[ :no, :input, :output, :inout, :inner ]

Constants included from Low::Low2Symbol

Low::Low2Symbol::Low2SymbolPrefix, Low::Low2Symbol::Low2SymbolTable, Low::Low2Symbol::Symbol2LowTable

Instance Attribute Summary collapse

Attributes inherited from Low::SignalI

#name, #type, #value

Attributes included from Low::Hparent

#parent

Instance Method Summary collapse

Methods included from HRef

#each, included, #to_event

Methods inherited from Low::SignalI

#clone, #each_deep, #eql?, #explicit_types!, #hash, #immutable?, #replace_names!, #set_name!, #set_type!, #set_value!, #to_c, #to_c_signal, #to_ch, #to_hdr, #to_high, #to_verilog, #to_vhdl, #width

Methods included from Low::Low2Symbol

#to_sym

Methods included from Low::Hparent

#hierarchy, #scope

Constructor Details

#initialize(name, type, dir, value = nil) ⇒ SignalI

Creates a new signal named +name+ typed as +type+ with +dir+ as bounding direction and possible +value+.

NOTE: +dir+ can be :input, :output, :inout or :inner



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# File 'lib/HDLRuby/hruby_high.rb', line 3417

def initialize(name,type,dir,value =  nil)
    # Check the value.
    value = value.to_expr.match_type(type) if value
    # Initialize the type structure.
    super(name,type,value)

    unless name.empty? then
        # Named signal, set the hdl-like access to the signal.
        obj = self # For using the right self within the proc
        High.space_reg(name) { obj }
    end

    # Hierarchical type allows access to sub references, so generate
    # the corresponding methods.
    if type.struct? then
        type.each_name do |name|
            self.define_singleton_method(name) do
                RefObject.new(self.to_ref,
                            SignalI.new(name,type.get_type(name),dir))
            end
        end
    end

    # Check and set the bound.
    self.dir = dir

    # Set the read and write authorisations.
    @can_read = 1.to_expr
    @can_write = 1.to_expr
end

Instance Attribute Details

#can_read ⇒ Object

Tells if the signal can be read.



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# File 'lib/HDLRuby/hruby_high.rb', line 3408

def can_read
  @can_read
end

#can_write ⇒ Object

Tells if the signal can be written.



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# File 'lib/HDLRuby/hruby_high.rb', line 3411

def can_write
  @can_write
end

#dir ⇒ Object

The bounding direction.



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# File 'lib/HDLRuby/hruby_high.rb', line 3405

def dir
  @dir
end

Instance Method Details

#coerce(obj) ⇒ Object

Coerce by converting signal to an expression.



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# File 'lib/HDLRuby/hruby_high.rb', line 3492

def coerce(obj)
    return [obj,self.to_expr]
end

#edge ⇒ Object

Creates an edge event from the signal.



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# File 'lib/HDLRuby/hruby_high.rb', line 3477

def edge
    return Event.new(:edge,self.to_ref)
end

#negedge ⇒ Object

Creates a negative edge event from the signal.



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# File 'lib/HDLRuby/hruby_high.rb', line 3472

def negedge
    return Event.new(:negedge,self.to_ref)
end

#posedge ⇒ Object

Creates a positive edge event from the signal.



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# File 'lib/HDLRuby/hruby_high.rb', line 3467

def posedge
    return Event.new(:posedge,self.to_ref)
end

#to_expr ⇒ Object

Converts to a new expression.



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# File 'lib/HDLRuby/hruby_high.rb', line 3487

def to_expr
    return self.to_ref
end

#to_low(name = self.name) ⇒ Object

Converts the system to HDLRuby::Low and set its +name+.



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# File 'lib/HDLRuby/hruby_high.rb', line 3497

def to_low(name = self.name)
    # return HDLRuby::Low::SignalI.new(name,self.type.to_low)
    signalIL = HDLRuby::Low::SignalI.new(name,self.type.to_low)
    # # For debugging: set the source high object 
    # signalIL.properties[:low2high] = self.hdr_id
    # self.properties[:high2low] = signalIL
    return signalIL
end

#to_ref ⇒ Object

Converts to a new reference.



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# File 'lib/HDLRuby/hruby_high.rb', line 3482

def to_ref
    return RefObject.new(this,self)
end