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Add an invertor hardware model.
[matthijs/master-project/cλash.git]
/
Adders.hs
diff --git
a/Adders.hs
b/Adders.hs
index c39857898abaa856a1206107c861115a4b08bfa1..c2810d5b397af025816fa3e0ed5a87e95163ab0d 100644
(file)
--- a/
Adders.hs
+++ b/
Adders.hs
@@
-10,18
+10,26
@@
show_add f = do print ("Sum: " ++ (displaysigs s)); print ("Carry: " ++ (displ
b = [Low, Low, Low, High]
(s, c) = f (a, b)
b = [Low, Low, Low, High]
(s, c) = f (a, b)
--- Combinatoric no-carry adder
+-- Not really an adder, but this is nice minimal hardware description
+wire :: Bit -> Bit
+wire a = a
+
+-- Not really an adder either, but a slightly more complex example
+inv :: Bit -> Bit
+inv a = hwnot a
+
+-- Combinatoric stateless no-carry adder
-- A -> B -> S
no_carry_adder :: (Bit, Bit) -> Bit
no_carry_adder (a, b) = a `hwxor` b
-- A -> B -> S
no_carry_adder :: (Bit, Bit) -> Bit
no_carry_adder (a, b) = a `hwxor` b
--- Combinatoric half adder
+-- Combinatoric
stateless
half adder
-- A -> B -> (S, C)
half_adder :: (Bit, Bit) -> (Bit, Bit)
half_adder (a, b) =
( a `hwxor` b, a `hwand` b )
-- A -> B -> (S, C)
half_adder :: (Bit, Bit) -> (Bit, Bit)
half_adder (a, b) =
( a `hwxor` b, a `hwand` b )
--- Combinatoric
(one-bit)
full adder
+-- Combinatoric
stateless
full adder
-- (A, B, C) -> (S, C)
full_adder :: (Bit, Bit, Bit) -> (Bit, Bit)
full_adder (a, b, cin) = (s, c)
-- (A, B, C) -> (S, C)
full_adder :: (Bit, Bit, Bit) -> (Bit, Bit)
full_adder (a, b, cin) = (s, c)