def Sub(n, **kwargs):
invert = Invert(n)
adder = Adders(n, True, True, **kwargs)
wire(invert.O, adder.I1)
wire(1, adder.CIN)
return AnonymousCircuit("I0", adder.I0, "I1", invert.I, "O", adder.O,
"COUT", adder.COUT)
def Negate(n, **kwargs):
invert = Invert(n)
adder = Adders(n, True, False, **kwargs)
wire(1, adder.CIN)
wire(constarray(0, n), adder.I0)
wire(invert.O, adder.I1)
return AnonymousCircuit("I", invert.I, "O", adder.O)
def SubC(n, **kwargs):
invert = Invert(n)
adder = Adders(n, True, True, **kwargs)
wire(invert.O, adder.I1)
notCarry = Not()
wire(notCarry.O, adder.CIN)
return AnonymousCircuit("I0", adder.I0, "I1", invert.I, "CIN", notCarry.I,
"O", adder.O, "COUT", adder.COUT)
def DefineCounterLoad(n,
cin=False,
cout=True,
incr=1,
next=False,
ce=False,
r=False,
s=False):
name = _CounterName('CounterLoad', n, ce, r, s)
if name in CounterCache:
return CounterCache[name]
args = []
args += ['DATA', Array(n, In(Bit))]
args += ['LOAD', In(Bit)]
if cin:
args += ['CIN', In(Bit)]
args += ["O", Array(n, Out(Bit))]
if cout:
args += ["COUT", Out(Bit)]
args += ClockInterface(ce, r, s)
Counter = DefineCircuit(name, *args)
add = Adders(n, cin=cin, cout=cout)
mux = Mux(2, n)
reg = Register(n, ce=ce, r=r, s=s)
wire(reg.O, add.I0)
wire(array(*int2seq(incr, n)), add.I1)
wire(add.O, mux.I0)
wire(Counter.DATA, mux.I1)
wire(Counter.LOAD, mux.S)
reg(mux)
if next:
wire(mux.O, Counter.O)
else:
wire(reg.O, Counter.O)
if cin:
wire(Counter.CIN, add.CIN)
if cout:
wire(add.COUT, Counter.COUT) # this is fishy because of the LOAD
wireclock(Counter, reg)
EndCircuit()
CounterCache[name] = Counter
return Counter
def DefineCounter(n,
cin=False,
cout=True,
incr=1,
next=False,
ce=False,
r=False,
s=False):
name = _CounterName('Counter', n, ce, r, s)
if name in CounterCache:
return CounterCache[name]
args = []
if cin:
args += ['CIN', In(Bit)]
args += ["O", Array(n, Out(Bit))]
if cout:
args += ["COUT", Out(Bit)]
args += ClockInterface(ce, r, s)
Counter = DefineCircuit(name, *args)
add = Adders(n, cin=cin, cout=cout)
reg = Register(n, ce=ce, r=r, s=s)
wire(reg.O, add.I0)
wire(array(*int2seq(incr, n)), add.I1)
reg(add)
if next:
wire(add.O, Counter.O)
else:
wire(reg.O, Counter.O)
if cin:
wire(Counter.CIN, add.CIN)
if cout:
wire(add.COUT, Counter.COUT)
wireclock(Counter, reg)
EndCircuit()
CounterCache[name] = Counter
return Counter
def DefineUpDownCounter(n, cout=True, next=False, ce=False, r=False, s=False):
name = _CounterName('UpDownCounter', n, ce, r, s)
if name in CounterCache:
return CounterCache[name]
args = []
args += ["U", In(Bit)]
args += ["D", In(Bit)]
args += ["O", Array(n, Out(Bit))]
if cout:
args += ["COUT", Out(Bit)]
args += ClockInterface(ce, r, s)
Counter = DefineCircuit(name, *args)
add = Adders(n, cin=True, cout=cout)
reg = Register(n, ce=ce, r=r, s=s)
wire(reg.O, add.I0)
wire(array(*(n * [Counter.D])), add.I1)
wire(Counter.U, add.CIN)
reg(add)
if next:
wire(add.O, Counter.O)
else:
wire(reg.O, Counter.O)
if cout:
wire(add.COUT, Counter.COUT)
wireclock(Counter, reg)
EndCircuit()
CounterCache[name] = Counter
return Counter
def Add(n, **kwargs):
return Adders(n, False, True, **kwargs)
def AddC(n, **kwargs):
return Adders(n, True, True, **kwargs)