Answer s achieved, primarily through the VHDL language, and schematic

四人抢答器的实现
................\qiangdaqi4ren
................\.............\.untf
................\.............\automake.log
................\.............\bitgen.ut
................\.............\ch41a.cmd_log
................\.............\ch41a.lso
................\.............\ch41a.ngc
................\.............\ch41a.ngr
................\.............\ch41a.prj
................\.............\ch41a.spl
................\.............\ch41a.stx
................\.............\ch41a.sym
................\.............\ch41a.syr
................\.............\ch41a.vhdl
................\.............\coregen.log
................\.............\coregen.prj
................\.............\d.cmd_log
................\.............\d.lso
................\.............\d.ngc
................\.............\d.ngr
................\.............\d.prj
................\.............\d.spl
................\.............\d.stx
................\.............\d.sym
................\.............\d.syr
................\.............\d.vhdl
................\.............\djs.spl
................\.............\djs.sym
................\.............\djs.vhdl
................\.............\djs2.spl
................\.............\djs2.sym
................\.............\d_chufaqi.cmd_log
................\.............\d_chufaqi.lso
................\.............\d_chufaqi.ngc
................\.............\d_chufaqi.ngr
................\.............\d_chufaqi.prj
................\.............\d_chufaqi.spl
................\.............\d_chufaqi.stx
................\.............\d_chufaqi.sym
................\.............\d_chufaqi.syr
................\.............\d_chufaqi.vhdl
................\.............\f01ms.spl
................\.............\f01ms.sym
................\.............\feng1.cmd_log
................\.............\feng1.lso
................\.............\feng1.ngc
................\.............\feng1.ngr
................\.............\feng1.prj
................\.............\feng1.spl
................\.............\feng1.stx
................\.............\feng1.sym
................\.............\feng1.syr
................\.............\feng1.vhdl
................\.............\fpq01ms.vhdl
................\.............\fpq1s.spl
................\.............\fpq1s.sym
................\.............\fpq1s.vhdl
................\.............\fpq2ms.spl
................\.............\fpq2ms.sym
................\.............\fpq2ms.vhdl
................\.............\lock.cmd_log
................\.............\lock.lso
................\.............\lock.ngc
................\.............\lock.ngr
................\.............\lock.prj
................\.............\lock.spl
................\.............\lock.stx
................\.............\lock.sym
................\.............\lock.syr
................\.............\lock.vhdl
................\.............\lock_tw.ANT
................\.............\lock_tw.fdo
................\.............\lock_tw.tbw
................\.............\lock_tw.udo
................\.............\lock_tw.vhw
................\.............\pepExtractor.prj
................\.............\qd.bgn
................\.............\qd.bld
................\.............\qd.cmd_log
................\.............\qd.drc
................\.............\qd.lso
................\.............\qd.mrp
................\.............\qd.nc1
................\.............\qd.ncd
................\.............\qd.ngc
................\.............\qd.ngd
................\.............\qd.ngm
................\.............\qd.ngr
................\.............\qd.pad
................\.............\qd.pad_txt
................\.............\qd.par
................\.............\qd.pcf
................\.............\qd.placed_ncd_tracker
................\.............\qd.prj
................\.............\qd.prm
................\.............\qd.routed_ncd_tracker
................\.............\qd.sch
................\.............\qd.sig
................\.............\qd.sym

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