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Release 7.1.04i - xst H.42
Copyright (c) 1995-2005 Xilinx, Inc.  All rights reserved.
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--> Reading design: follow_counter.prj

TABLE OF CONTENTS
  1) Synthesis Options Summary
  2) HDL Compilation
  3) HDL Analysis
  4) HDL Synthesis
  5) Advanced HDL Synthesis
     5.1) HDL Synthesis Report
  6) Low Level Synthesis
  7) Final Report
     7.1) Device utilization summary
     7.2) TIMING REPORT


=========================================================================
*                      Synthesis Options Summary                        *
=========================================================================
---- Source Parameters
Input File Name                    : "follow_counter.prj"
Input Format                       : mixed
Ignore Synthesis Constraint File   : NO

---- Target Parameters
Output File Name                   : "follow_counter"
Output Format                      : NGC
Target Device                      : xc2v2000-6-bg575

---- Source Options
Top Module Name                    : follow_counter
Automatic FSM Extraction           : YES
FSM Encoding Algorithm             : Auto
FSM Style                          : lut
RAM Extraction                     : Yes
RAM Style                          : Auto
ROM Extraction                     : Yes
ROM Style                          : Auto
Mux Extraction                     : YES
Mux Style                          : Auto
Decoder Extraction                 : YES
Priority Encoder Extraction        : YES
Shift Register Extraction          : YES
Logical Shifter Extraction         : YES
XOR Collapsing                     : YES
Resource Sharing                   : YES
Multiplier Style                   : auto
Automatic Register Balancing       : No

---- Target Options
Add IO Buffers                     : YES
Global Maximum Fanout              : 500
Add Generic Clock Buffer(BUFG)     : 16
Register Duplication               : YES
Equivalent register Removal        : YES
Slice Packing                      : YES
Pack IO Registers into IOBs        : auto

---- General Options
Optimization Goal                  : Speed
Optimization Effort                : 2
Keep Hierarchy                     : NO
Global Optimization                : AllClockNets
RTL Output                         : Yes
Write Timing Constraints           : NO
Hierarchy Separator                : _
Bus Delimiter                      : <>
Case Specifier                     : maintain
Slice Utilization Ratio            : 100
Slice Utilization Ratio Delta      : 5

---- Other Options
lso                                : follow_counter.lso
Read Cores                         : YES
cross_clock_analysis               : NO
verilog2001                        : YES
safe_implementation                : No
Optimize Instantiated Primitives   : NO
tristate2logic                     : Yes
use_clock_enable                   : Yes
use_sync_set                       : Yes
use_sync_reset                     : Yes
enable_auto_floorplanning          : No

=========================================================================


=========================================================================
*                          HDL Compilation                              *
=========================================================================
Compiling vhdl file "C:/Xilinx/bin/ArithmeticCoder/FOLLOW_COUNTER.vhd" in Library work.
Architecture rtl of Entity follow_counter is up to date.

=========================================================================
*                            HDL Analysis                               *
=========================================================================
Analyzing Entity <follow_counter> (Architecture <rtl>).
Entity <follow_counter> analyzed. Unit <follow_counter> generated.


=========================================================================
*                           HDL Synthesis                               *
=========================================================================

Synthesizing Unit <follow_counter>.
    Related source file is "C:/Xilinx/bin/ArithmeticCoder/FOLLOW_COUNTER.vhd".
    Found 8-bit comparator lessequal for signal <$n0003> created at line 30.
    Found 8-bit comparator greater for signal <$n0004> created at line 39.
    Found 8-bit updown counter for signal <NUMBER>.
    Summary:
        inferred   1 Counter(s).
        inferred   2 Comparator(s).
Unit <follow_counter> synthesized.


=========================================================================
*                       Advanced HDL Synthesis                          *
=========================================================================

Advanced RAM inference ...
Advanced multiplier inference ...
Advanced Registered AddSub inference ...
Dynamic shift register inference ...

=========================================================================
HDL Synthesis Report

Macro Statistics
# Counters                         : 1
 8-bit updown counter              : 1
# Comparators                      : 2
 8-bit comparator greater          : 1
 8-bit comparator lessequal        : 1

=========================================================================

=========================================================================
*                         Low Level Synthesis                           *
=========================================================================
WARNING:Xst:1988 - Unit <follow_counter>: instances <Mcompar__n0004>, <Mcompar__n0003> of unit <LPM_COMPARE_2> and unit <LPM_COMPARE_1> are dual, second instance is removed

Optimizing unit <follow_counter> ...
Loading device for application Rf_Device from file '2v2000.nph' in environment C:/Xilinx.

Mapping all equations...
Building and optimizing final netlist ...
Found area constraint ratio of 100 (+ 5) on block follow_counter, actual ratio is 0.

=========================================================================
*                            Final Report                               *
=========================================================================
Final Results
RTL Top Level Output File Name     : follow_counter.ngr
Top Level Output File Name         : follow_counter
Output Format                      : NGC
Optimization Goal                  : Speed
Keep Hierarchy                     : NO

Design Statistics
# IOs                              : 5

Macro Statistics :
# Registers                        : 1
#      8-bit register              : 1
# Adders/Subtractors               : 1
#      8-bit addsub                : 1
# Comparators                      : 2
#      8-bit comparator greater    : 1
#      8-bit comparator lessequal  : 1

Cell Usage :
# BELS                             : 29
#      LUT2                        : 3
#      LUT3                        : 1
#      LUT3_L                      : 8
#      LUT4                        : 1
#      LUT4_D                      : 1
#      MUXCY                       : 7
#      XORCY                       : 8
# FlipFlops/Latches                : 8
#      FDRE                        : 8
# Clock Buffers                    : 1
#      BUFGP                       : 1
# IO Buffers                       : 4
#      IBUF                        : 3
#      OBUF                        : 1
=========================================================================

Device utilization summary:
---------------------------

Selected Device : 2v2000bg575-6 

 Number of Slices:                       7  out of  10752     0%  
 Number of Slice Flip Flops:             8  out of  21504     0%  
 Number of 4 input LUTs:                14  out of  21504     0%  
 Number of bonded IOBs:                  5  out of    408     1%  
 Number of GCLKs:                        1  out of     16     6%  


=========================================================================
TIMING REPORT

NOTE: THESE TIMING NUMBERS ARE ONLY A SYNTHESIS ESTIMATE.
      FOR ACCURATE TIMING INFORMATION PLEASE REFER TO THE TRACE REPORT
      GENERATED AFTER PLACE-and-ROUTE.

Clock Information:
------------------
-----------------------------------+------------------------+-------+
Clock Signal                       | Clock buffer(FF name)  | Load  |
-----------------------------------+------------------------+-------+
CLOCK                              | BUFGP                  | 8     |
-----------------------------------+------------------------+-------+

Timing Summary:
---------------
Speed Grade: -6

   Minimum period: 3.586ns (Maximum Frequency: 278.901MHz)
   Minimum input arrival time before clock: 3.673ns
   Maximum output required time after clock: 7.321ns
   Maximum combinational path delay: 6.022ns

Timing Detail:
--------------
All values displayed in nanoseconds (ns)

=========================================================================
Timing constraint: Default period analysis for Clock 'CLOCK'
  Clock period: 3.586ns (frequency: 278.901MHz)
  Total number of paths / destination ports: 128 / 16
-------------------------------------------------------------------------
Delay:               3.586ns (Levels of Logic = 3)
  Source:            NUMBER_2 (FF)
  Destination:       NUMBER_6 (FF)
  Source Clock:      CLOCK rising
  Destination Clock: CLOCK rising

  Data Path: NUMBER_2 to NUMBER_6
                                Gate     Net
    Cell:in->out      fanout   Delay   Delay  Logical Name (Net Name)
    ----------------------------------------  ------------
     FDRE:C->Q             2   0.449   0.743  NUMBER_2 (NUMBER_2)
     LUT4:I0->O            1   0.347   0.414  _n000419 (CHOICE19)
     LUT4_D:I3->LO         1   0.347   0.127  _n0004112 (N15)
     LUT3:I2->O            8   0.347   0.621  _n00091 (_n0009)
     FDRE:CE                   0.190          NUMBER_0
    ----------------------------------------
    Total                      3.586ns (1.680ns logic, 1.905ns route)
                                       (46.9% logic, 53.1% route)

=========================================================================
Timing constraint: Default OFFSET IN BEFORE for Clock 'CLOCK'
  Total number of paths / destination ports: 112 / 24
-------------------------------------------------------------------------
Offset:              3.673ns (Levels of Logic = 10)
  Source:            INCREMENT (PAD)
  Destination:       NUMBER_7 (FF)
  Destination Clock: CLOCK rising

  Data Path: INCREMENT to NUMBER_7
                                Gate     Net
    Cell:in->out      fanout   Delay   Delay  Logical Name (Net Name)
    ----------------------------------------  ------------
     IBUF:I->O            10   0.653   0.879  INCREMENT_IBUF (INCREMENT_IBUF)
     LUT2:I0->O            1   0.347   0.383  NUMBER__n00021 (NUMBER__n0002)
     MUXCY:CI->O           1   0.042   0.000  follow_counter_NUMBER__n0000<0>cy (follow_counter_NUMBER__n0000<0>_cyo)
     MUXCY:CI->O           1   0.042   0.000  follow_counter_NUMBER__n0000<1>cy (follow_counter_NUMBER__n0000<1>_cyo)
     MUXCY:CI->O           1   0.042   0.000  follow_counter_NUMBER__n0000<2>cy (follow_counter_NUMBER__n0000<2>_cyo)
     MUXCY:CI->O           1   0.042   0.000  follow_counter_NUMBER__n0000<3>cy (follow_counter_NUMBER__n0000<3>_cyo)
     MUXCY:CI->O           1   0.042   0.000  follow_counter_NUMBER__n0000<4>cy (follow_counter_NUMBER__n0000<4>_cyo)
     MUXCY:CI->O           1   0.042   0.000  follow_counter_NUMBER__n0000<5>cy (follow_counter_NUMBER__n0000<5>_cyo)
     MUXCY:CI->O           0   0.042   0.000  follow_counter_NUMBER__n0000<6>cy (follow_counter_NUMBER__n0000<6>_cyo)
     XORCY:CI->O           1   0.824   0.000  follow_counter_NUMBER__n0000<7>_xor (NUMBER__n0000<7>)
     FDRE:D                    0.293          NUMBER_7
    ----------------------------------------
    Total                      3.673ns (2.411ns logic, 1.262ns route)
                                       (65.6% logic, 34.4% route)

=========================================================================
Timing constraint: Default OFFSET OUT AFTER for Clock 'CLOCK'
  Total number of paths / destination ports: 8 / 1
-------------------------------------------------------------------------
Offset:              7.321ns (Levels of Logic = 4)
  Source:            NUMBER_2 (FF)
  Destination:       OUTPUT (PAD)
  Source Clock:      CLOCK rising

  Data Path: NUMBER_2 to OUTPUT
                                Gate     Net
    Cell:in->out      fanout   Delay   Delay  Logical Name (Net Name)
    ----------------------------------------  ------------
     FDRE:C->Q             2   0.449   0.743  NUMBER_2 (NUMBER_2)
     LUT4:I0->O            1   0.347   0.415  _n000419 (CHOICE19)
     LUT4_D:I3->O          1   0.347   0.548  _n0004112 (_n0004)
     LUT2:I1->O            1   0.347   0.383  _n00021 (OUTPUT_OBUF)
     OBUF:I->O                 3.743          OUTPUT_OBUF (OUTPUT)
    ----------------------------------------
    Total                      7.321ns (5.233ns logic, 2.088ns route)
                                       (71.5% logic, 28.5% route)

=========================================================================
Timing constraint: Default path analysis
  Total number of paths / destination ports: 1 / 1
-------------------------------------------------------------------------
Delay:               6.022ns (Levels of Logic = 3)
  Source:            TEST (PAD)
  Destination:       OUTPUT (PAD)

  Data Path: TEST to OUTPUT
                                Gate     Net
    Cell:in->out      fanout   Delay   Delay  Logical Name (Net Name)
    ----------------------------------------  ------------
     IBUF:I->O            11   0.653   0.897  TEST_IBUF (TEST_IBUF)
     LUT2:I0->O            1   0.347   0.383  _n00021 (OUTPUT_OBUF)
     OBUF:I->O                 3.743          OUTPUT_OBUF (OUTPUT)
    ----------------------------------------
    Total                      6.022ns (4.743ns logic, 1.279ns route)
                                       (78.8% logic, 21.2% route)

=========================================================================
CPU : 4.63 / 4.98 s | Elapsed : 5.00 / 5.00 s
 
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Total memory usage is 121148 kilobytes

Number of errors   :    0 (   0 filtered)
Number of warnings :    1 (   0 filtered)
Number of infos    :    0 (   0 filtered)