This is my own Spartan3E write recently, a development board with a knob control the flow of LED lights can be clockwise, counterclockwise, press the knob to the lamp, and the development environment ISE10.1

led_rotate\AutoConstraint_led_rotate.sdc
..........\device_usage_statistics.html
..........\led_rotate.bgn
..........\led_rotate.bit
..........\led_rotate.bld
..........\led_rotate.cmd_log
..........\led_rotate.drc
..........\led_rotate.edn
..........\led_rotate.fse
..........\led_rotate.gise
..........\led_rotate.ipf
..........\led_rotate.ise
..........\led_rotate.lso
..........\led_rotate.ncd
..........\led_rotate.ncf
..........\led_rotate.ngc
..........\led_rotate.ngd
..........\led_rotate.ngr
..........\led_rotate.ntrc_log
..........\led_rotate.pad
..........\led_rotate.par
..........\led_rotate.pcf
..........\led_rotate.prj
..........\led_rotate.ptwx
..........\led_rotate.restore
..........\led_rotate.sdc
..........\led_rotate.srd
..........\led_rotate.srm
..........\led_rotate.srr
..........\led_rotate.srs
..........\led_rotate.stx
..........\led_rotate.syr
..........\led_rotate.tlg
..........\led_rotate.twr
..........\led_rotate.twx
..........\led_rotate.ucf
..........\led_rotate.unroutes
..........\led_rotate.ut
..........\led_rotate.v
..........\led_rotate.xise
..........\led_rotate.xpi
..........\led_rotate.xst
..........\led_rotate_compile.tcl
..........\led_rotate_guide.ncd
..........\led_rotate_ise11migration.zip
..........\led_rotate_map.map
..........\led_rotate_map.mrp
..........\led_rotate_map.ncd
..........\led_rotate_map.ngm
..........\led_rotate_map.tcl
..........\led_rotate_map.xrpt
..........\led_rotate_ngdbuild.xrpt
..........\led_rotate_pad.csv
..........\led_rotate_pad.txt
..........\led_rotate_par.xrpt
..........\led_rotate_prev_built.ngd
..........\led_rotate_summary.html
..........\led_rotate_summary.xml
..........\led_rotate_usage.xml
..........\...........xdb\cst.xbcd
..........\..............\tmp\ise\version
..........\..............\...\...\__OBJSTORE__\HierarchicalDesign\HDProject\HDProject
..........\..............\...\...\............\..................\.........\HDProject_StrTbl
..........\..............\...\...\............\..................\__stored_object_table__
..........\..............\...\...\............\PnAutoRun\Scripts\RunOnce_tcl
..........\..............\...\...\............\.........\.......\RunOnce_tcl_StrTbl
..........\..............\...\...\............\.rojectNavigator\dpm_project_main\dpm_project_main
..........\..............\...\...\............\................\................\dpm_project_main_StrTbl
..........\..............\...\...\............\................Gui\CViewSelector
..........\..............\...\...\............\...................\CViewSelector_StrTbl
..........\..............\...\...\............\...................\File-SynthesisOnly
..........\..............\...\...\............\...................\File-SynthesisOnly_StrTbl
..........\..............\...\...\............\...................\GuiProjectData
..........\..............\...\...\............\...................\GuiProjectData_StrTbl
..........\..............\...\...\............\...................\Library-SynthesisOnly
..........\..............\...\...\............\...................\Library-SynthesisOnly_StrTbl
..........\..............\...\...\............\...................\Process-SynthesisOnly-
..........\..............\...\...\............\...................\Process-SynthesisOnly-DESUT_UCF
..........\..............\...\...\............\...................\Process-SynthesisOnly-DESUT_UCF_StrTbl
..........\..............\...\...\............\...................\Process-SynthesisOnly-DESUT_VERILOG
..........\..............\...\...\............\...................\Process-SynthesisOnly-DESUT_VERILOG_StrTbl
..........\..............\...\...\............\...................\Process-SynthesisOnly-_StrTbl
..........\..............\...\...\............\...................\Source-SynthesisOnly-AutoCompile
..........\..............\...\...\............\...................\Source-SynthesisOnly-AutoCompile_StrTbl
..........\..............\...\...\............\xreport\Gc_RvReportViewer-Current-Module
..........\..............\...\...\............\.......\Gc_RvReportViewer-Current-Module_St

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