gray_counter_v.sdo

gray码计数器 用于减少出错率 代码已经仿真 请放心下载

// Copyright (C) 1991-2006 Altera Corporation
// Your use of Altera Corporation's design tools, logic functions 
// and other software and tools, and its AMPP partner logic 
// functions, and any output files from any of the foregoing 
// (including device programming or simulation files), and any 
// associated documentation or information are expressly subject 
// to the terms and conditions of the Altera Program License 
// Subscription Agreement, Altera MegaCore Function License 
// Agreement, or other applicable license agreement, including, 
// without limitation, that your use is for the sole purpose of 
// programming logic devices manufactured by Altera and sold by 
// Altera or its authorized distributors.  Please refer to the 
// applicable agreement for further details.


// 
// Device: Altera EP2C5F256C6 Package FBGA256
// 

// 
// This SDF file should be used for ModelSim (Verilog) only
// 

(DELAYFILE
  (SDFVERSION "2.1")
  (DESIGN "gray_counter")
  (DATE "10/22/2007 19:05:12")
  (VENDOR "Altera")
  (PROGRAM "Quartus II")
  (VERSION "Version 6.1 Build 201 11/27/2006 SJ Full Version")
  (DIVIDER .)
  (TIMESCALE 1 ps)

  (CELL
    (CELLTYPE "cycloneii_asynch_io")
    (INSTANCE clk\~I.asynch_inst)
    (DELAY
      (ABSOLUTE
        (IOPATH padio combout (979:979:979) (979:979:979))
      )
    )
  )
  (CELL
    (CELLTYPE "cycloneii_clkctrl")
    (INSTANCE clk\~clkctrl_I)
    (DELAY
      (ABSOLUTE
        (PORT inclk[0] (122:122:122) (118:118:118))
      )
    )
  )
  (CELL
    (CELLTYPE "cycloneii_ena_reg")
    (INSTANCE clk\~clkctrl_I.extena0_reg)
    (DELAY
      (ABSOLUTE
        (PORT d (254:254:254) (254:254:254))
        (PORT clk (0:0:0) (0:0:0))
        (IOPATH (posedge clk) q (218:218:218) (218:218:218))
      )
    )
    (TIMINGCHECK
      (SETUP d (posedge clk) (50:50:50))
      (HOLD d (posedge clk) (100:100:100))
    )
  )
  (CELL
    (CELLTYPE "cycloneii_asynch_io")
    (INSTANCE clr\~I.asynch_inst)
    (DELAY
      (ABSOLUTE
        (IOPATH padio combout (822:822:822) (822:822:822))
      )
    )
  )
  (CELL
    (CELLTYPE "cycloneii_lcell_comb")
    (INSTANCE counter\~56_I)
    (DELAY
      (ABSOLUTE
        (PORT datad (4784:4784:4784) (4708:4708:4708))
        (IOPATH datac combout (323:323:323) (323:323:323))
        (IOPATH datad combout (150:150:150) (150:150:150))
      )
    )
  )
  (CELL
    (CELLTYPE "cycloneii_lcell_ff")
    (INSTANCE counter\[3\]\~I)
    (DELAY
      (ABSOLUTE
        (PORT clk (1238:1238:1238) (1231:1231:1231))
        (PORT datain (84:84:84) (84:84:84))
        (IOPATH (posedge clk) regout (250:250:250) (250:250:250))
      )
    )
    (TIMINGCHECK
      (HOLD datain (posedge clk) (266:266:266))
    )
  )
  (CELL
    (CELLTYPE "cycloneii_lcell_comb")
    (INSTANCE counter\~55_I)
    (DELAY
      (ABSOLUTE
        (PORT datab (4786:4786:4786) (4708:4708:4708))
        (PORT datad (317:317:317) (288:288:288))
        (IOPATH datab combout (419:419:419) (419:419:419))
        (IOPATH datac combout (323:323:323) (323:323:323))
        (IOPATH datad combout (150:150:150) (150:150:150))
      )
    )
  )
  (CELL
    (CELLTYPE "cycloneii_lcell_ff")
    (INSTANCE counter\[2\]\~I)
    (DELAY
      (ABSOLUTE
        (PORT clk (1238:1238:1238) (1231:1231:1231))
        (PORT datain (84:84:84) (84:84:84))
        (IOPATH (posedge clk) regout (250:250:250) (250:250:250))
      )
    )
    (TIMINGCHECK
      (HOLD datain (posedge clk) (266:266:266))
    )
  )
  (CELL
    (CELLTYPE "cycloneii_lcell_comb")
    (INSTANCE grayout\~1_I)
    (DELAY
      (ABSOLUTE
        (PORT datab (491:491:491) (431:431:431))
        (PORT datac (507:507:507) (440:440:440))
        (IOPATH datab combout (420:420:420) (420:420:420))
        (IOPATH datac combout (275:275:275) (275:275:275))
      )
    )
  )
  (CELL
    (CELLTYPE "cycloneii_lcell_comb")
    (INSTANCE counter\~57_I)
    (DELAY
      (ABSOLUTE
        (PORT dataa (334:334:334) (294:294:294))
        (PORT datab (4789:4789:4789) (4710:4710:4710))
        (PORT datad (315:315:315) (286:286:286))
        (IOPATH dataa combout (437:437:437) (437:437:437))
        (IOPATH datab combout (419:419:419) (419:419:419))
        (IOPATH datac combout (323:323:323) (323:323:323))
        (IOPATH datad combout (150:150:150) (150:150:150))
      )
    )
  )
  (CELL
    (CELLTYPE "cycloneii_lcell_ff")
    (INSTANCE counter\[1\]\~I)
    (DELAY
      (ABSOLUTE
        (PORT clk (1238:1238:1238) (1231:1231:1231))
        (PORT datain (84:84:84) (84:84:84))
        (IOPATH (posedge clk) regout (250:250:250) (250:250:250))
      )
    )
    (TIMINGCHECK
      (HOLD datain (posedge clk) (266:266:266))
    )
  )
  (CELL
    (CELLTYPE "cycloneii_lcell_comb")
    (INSTANCE grayout\~0_I)
    (DELAY
      (ABSOLUTE
        (PORT datac (504:504:504) (439:439:439))
        (PORT datad (320:320:320) (292:292:292))
        (IOPATH datac combout (275:275:275) (275:275:275))
        (IOPATH datad combout (150:150:150) (150:150:150))
      )
    )
  )
  (CELL
    (CELLTYPE "cycloneii_asynch_io")
    (INSTANCE q\[3\]\~I.asynch_inst)
    (DELAY
      (ABSOLUTE
        (PORT datain (449:449:449) (459:459:459))
        (IOPATH datain padio (2612:2612:2612) (2612:2612:2612))
      )
    )
  )
  (CELL
    (CELLTYPE "cycloneii_asynch_io")
    (INSTANCE q\[2\]\~I.asynch_inst)
    (DELAY
      (ABSOLUTE
        (PORT datain (449:449:449) (459:459:459))
        (IOPATH datain padio (2622:2622:2622) (2622:2622:2622))
      )
    )
  )
  (CELL
    (CELLTYPE "cycloneii_asynch_io")
    (INSTANCE q\[1\]\~I.asynch_inst)
    (DELAY
      (ABSOLUTE
        (PORT datain (689:689:689) (662:662:662))
        (IOPATH datain padio (2612:2612:2612) (2612:2612:2612))
      )
    )
  )
  (CELL
    (CELLTYPE "cycloneii_asynch_io")
    (INSTANCE qb\[3\]\~I.asynch_inst)
    (DELAY
      (ABSOLUTE
        (PORT datain (459:459:459) (449:449:449))
        (IOPATH datain padio (2622:2622:2622) (2622:2622:2622))
      )
    )
  )
  (CELL
    (CELLTYPE "cycloneii_asynch_io")
    (INSTANCE qb\[2\]\~I.asynch_inst)
    (DELAY
      (ABSOLUTE
        (PORT datain (459:459:459) (449:449:449))
        (IOPATH datain padio (2602:2602:2602) (2602:2602:2602))
      )
    )
  )
  (CELL
    (CELLTYPE "cycloneii_asynch_io")
    (INSTANCE qb\[1\]\~I.asynch_inst)
    (DELAY
      (ABSOLUTE
        (PORT datain (662:662:662) (689:689:689))
        (IOPATH datain padio (2612:2612:2612) (2612:2612:2612))
      )
    )
  )
)