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diff --git a/VHDLTypes.hs b/VHDLTypes.hs
index 34a2b50..b4c1d69 100644
--- a/VHDLTypes.hs
+++ b/VHDLTypes.hs
@@ -1,19 +1,103 @@
 --
 -- Some types used by the VHDL module.
 --
+{-# LANGUAGE TemplateHaskell #-}
 module VHDLTypes where
 
+-- Standard imports
+import qualified Control.Monad.Trans.State as State
+import qualified Data.Map as Map
+import Data.Accessor
+import qualified Data.Accessor.Template
+
+-- GHC API imports
+import qualified Type
+import qualified CoreSyn
+import qualified HscTypes
+
+-- ForSyDe imports
 import qualified ForSyDe.Backend.VHDL.AST as AST
 
-import FlattenTypes
+-- Local imports
 
-type VHDLSignalMap = SignalMap AST.VHDLId
+-- A description of a port of an entity
+type Port = (AST.VHDLId, AST.TypeMark)
 
 -- A description of a VHDL entity. Contains both the entity itself as well as
 -- info on how to map a haskell value (argument / result) on to the entity's
 -- ports.
-data Entity = Entity {
-  ent_args   :: [VHDLSignalMap],      -- A mapping of each function argument to port names
-  ent_res    :: VHDLSignalMap,        -- A mapping of the function result to port names
-  ent_decl   :: Maybe AST.EntityDec   -- The actual entity declaration. Can be empty for builtin functions.
+data Entity = Entity { 
+  ent_id     :: AST.VHDLId,           -- The id of the entity
+  ent_args   :: [Port],      -- A mapping of each function argument to port names
+  ent_res    :: Port         -- A mapping of the function result to port names
+} deriving (Show);
+
+-- A orderable equivalent of CoreSyn's Type for use as a map key
+newtype OrdType = OrdType { getType :: Type.Type }
+instance Eq OrdType where
+  (OrdType a) == (OrdType b) = Type.tcEqType a b
+instance Ord OrdType where
+  compare (OrdType a) (OrdType b) = Type.tcCmpType a b
+
+data HType = StdType OrdType |
+             ADTType String [HType] |
+             VecType OrdType HType |
+             SizedWType Int |
+             RangedWType Int |
+             SizedIType Int |
+             BuiltinType String
+  deriving (Eq, Ord)
+
+-- A map of a Core type to the corresponding type name
+type TypeMap = Map.Map HType (AST.VHDLId, Either AST.TypeDef AST.SubtypeIn)
+
+-- A map of a vector Core element type and function name to the coressponding
+-- VHDLId of the function and the function body.
+type TypeFunMap = Map.Map (OrdType, String) (AST.VHDLId, AST.SubProgBody)
+
+-- A map of a Haskell function to a hardware signature
+type SignatureMap = Map.Map CoreSyn.CoreBndr Entity
+
+type TfpIntMap = Map.Map OrdType Int
+
+data TypeState = TypeState {
+  -- | A map of Core type -> VHDL Type
+  vsTypes_      :: TypeMap,
+  -- | A list of type declarations
+  vsTypeDecls_  :: [AST.PackageDecItem],
+  -- | A map of vector Core type -> VHDL type function
+  vsTypeFuns_   :: TypeFunMap,
+  vsTfpInts_    :: TfpIntMap,
+  vsHscEnv_     :: HscTypes.HscEnv
+}
+-- Derive accessors
+$( Data.Accessor.Template.deriveAccessors ''TypeState )
+-- Define a session
+type TypeSession = State.State TypeState
+
+data VHDLState = VHDLState {
+  -- | A subtype with typing info
+  vsType_       :: TypeState,
+  -- | A map of HsFunction -> hardware signature (entity name, port names,
+  --   etc.)
+  vsSignatures_ :: SignatureMap
 }
+
+-- Derive accessors
+$( Data.Accessor.Template.deriveAccessors ''VHDLState )
+
+-- | The state containing a VHDL Session
+type VHDLSession = State.State VHDLState
+
+-- A function that generates VHDL for a builtin function
+type BuiltinBuilder = 
+  (Either CoreSyn.CoreBndr AST.VHDLName) -- ^ The destination signal and it's original type
+  -> CoreSyn.CoreBndr -- ^ The function called
+  -> [Either CoreSyn.CoreExpr AST.Expr] -- ^ The value arguments passed (excluding type and
+                    --   dictionary arguments).
+  -> VHDLSession [AST.ConcSm] -- ^ The resulting concurrent statements.
+
+-- A map of a builtin function to VHDL function builder 
+type NameTable = Map.Map String (Int, BuiltinBuilder )
+
+-- vim: set ts=8 sw=2 sts=2 expandtab: