EDIFを書いてみる

まずは，

Lチカ...と言いたいところですが，もっとシンプルな「ボタンを押したらLEDを光らせる」から．二つのLEDに対して，一方はボタンを押したら光らせる，もう一方はボタンを押したら消す，というサンプルです．

コード

早速コードです．

myedif_test.edif

(edif myedif_test2
  (edifversion 2 0 0)
  (edifLevel 0)
  (keywordmap (keywordlevel 0))

  (library hdi_primitives
   (edifLevel 0)
   (technology (numberDefinition ))
   (cell GND (celltype GENERIC)
     (view netlist (viewtype NETLIST)
       (interface 
        (port G (direction OUTPUT)))))
   (cell OBUF (celltype GENERIC)
     (view netlist (viewtype NETLIST)
       (interface 
        (port O (direction OUTPUT))
        (port I (direction INPUT)))))
   (cell IBUF (celltype GENERIC)
     (view netlist (viewtype NETLIST)
       (interface 
        (port O (direction OUTPUT))
        (port I (direction INPUT)))))
   (cell VCC (celltype GENERIC)
     (view netlist (viewtype NETLIST)
       (interface 
        (port P (direction OUTPUT)))))
   (cell INV (celltype GENERIC)
     (view netlist (viewtype NETLIST)
       (interface
         (port I (direction INPUT))
         (port O (direction OUTPUT))))))

  (library work
    (edifLevel 0)
    (technology (numberDefinition ))
   (cell myedif_test2 (celltype GENERIC)
     (view myedif_test2 (viewtype NETLIST)
       (interface 
        (port Q0 (direction OUTPUT))
        (port Q1 (direction OUTPUT))
        (port SW (direction INPUT)))
       (contents
         (instance GND (viewref netlist (cellref GND (libraryref hdi_primitives))))
         (instance Q0_OBUF (viewref netlist (cellref OBUF (libraryref hdi_primitives))))
         (instance Q1_OBUF (viewref netlist (cellref OBUF (libraryref hdi_primitives))))
         (instance U_INV_0 (viewref netlist (cellref INV (libraryref hdi_primitives))))
         (instance SW_IBUF (viewref netlist (cellref IBUF (libraryref hdi_primitives))))
         (instance VCC (viewref netlist (cellref VCC (libraryref hdi_primitives))))
         (net Q0 (joined
          (portref O (instanceref Q0_OBUF))
          (portref Q0)))
         (net N0 (joined
          (portref I (instanceref Q0_OBUF))
          (portref O (instanceref SW_IBUF))))
         (net Q1 (joined
          (portref O (instanceref Q1_OBUF))
          (portref Q1)))
         (net N1 (joined
          (portref I (instanceref Q1_OBUF))
          (portref O (instanceref U_INV_0))))
         (net N2 (joined
          (portref I (instanceref U_INV_0))
          (portref O (instanceref SW_IBUF))))
         (net SW (joined
          (portref I (instanceref SW_IBUF))
          (portref SW)))
       ))))
  
  (design myedif_test2 (cellref myedif_test2 (libraryref work)))

)

なんとなく読めますね．

注意点

基本的には(1)ポートとかインスタンスを定義して，(2)それらの間をつないでいく，でよい．ネットの名前は，名前は好きにつけてよいのだけど，ポートに出力するネットはポート名と同じにしておかないとucfでおこられてしまうので注意．

次

次はLチカやります．CARRYとかFDREとかLUTとか必要なので，一気に複雑になる，はず．