You will design a hexadecimal calculator.four push buttons represent Addition, Subtraction, Multiplication and Enter. There are also eight binary switches used to enter two operands for each calculation. The four digit hexadecimal display shows the selected operands and the calculated result.

CHENLI_VHDL_FINAL
.................\calculate.vhd
.................\calculator_topdesign.bgn
.................\calculator_topdesign.bit
.................\Calculator_TopDesign.bld
.................\Calculator_TopDesign.cmd_log
.................\calculator_topdesign.drc
.................\Calculator_TopDesign.lso
.................\Calculator_TopDesign.ncd
.................\Calculator_TopDesign.ngc
.................\Calculator_TopDesign.ngd
.................\Calculator_TopDesign.ngr
.................\Calculator_TopDesign.pad
.................\Calculator_TopDesign.par
.................\Calculator_TopDesign.pcf
.................\Calculator_TopDesign.prj
.................\Calculator_TopDesign.ptwx
.................\Calculator_TopDesign.stx
.................\Calculator_TopDesign.syr
.................\Calculator_TopDesign.twr
.................\Calculator_TopDesign.twx
.................\Calculator_TopDesign.unroutes
.................\Calculator_TopDesign.ut
.................\Calculator_TopDesign.vhd
.................\Calculator_TopDesign.xpi
.................\Calculator_TopDesign.xst
.................\Calculator_TopDesign_guide.ncd
.................\Calculator_TopDesign_map.map
.................\Calculator_TopDesign_map.mrp
.................\Calculator_TopDesign_map.ncd
.................\Calculator_TopDesign_map.ngm
.................\Calculator_TopDesign_map.xrpt
.................\Calculator_TopDesign_ngdbuild.xrpt
.................\Calculator_TopDesign_pad.csv
.................\Calculator_TopDesign_pad.txt
.................\Calculator_TopDesign_par.xrpt
.................\Calculator_TopDesign_prev_built.ngd
.................\Calculator_TopDesign_summary.html
.................\Calculator_TopDesign_summary.xml
.................\Calculator_TopDesign_usage.xml
.................\Calculator_TopDesign_vhdl.prj
.................\Calculator_TopDesign_xst.xrpt
.................\CHENLI_VHDL.gise
.................\CHENLI_VHDL.ise
.................\CHENLI_VHDL.ntrc_log
.................\CHENLI_VHDL.xise
.................\CHENLI_VHDL_xdb
.................\...............\cst.xbcd
.................\...............\tmp
.................\...............\...\ise
.................\...............\...\ise.lock
.................\...............\...\...\version
.................\...............\...\...\__OBJSTORE__
.................\...............\...\...\............\Autonym
.................\...............\...\...\............\common
.................\...............\...\...\............\HierarchicalDesign
.................\...............\...\...\............\..................\HDProject
.................\...............\...\...\............\..................\.........\HDProject
.................\...............\...\...\............\..................\.........\HDProject_StrTbl
.................\...............\...\...\............\..................\__stored_object_table__
.................\...............\...\...\............\PnAutoRun
.................\...............\...\...\............\.........\Scripts
.................\...............\...\...\............\.........\.......\RunOnce_tcl
.................\...............\...\...\............\.........\.......\RunOnce_tcl_StrTbl
.................\...............\...\...\............\ProjectNavigator
.................\...............\...\...\............\ProjectNavigator11
.................\...............\...\...\............\ProjectNavigatorGui
.................\...............\...\...\............\...................\CViewSelector
.................\...............\...\...\............\...................\CViewSelector_StrTbl
.................\...............\...\...\............\...................\File-SynthesisOnly
.................\...............\...\...\............\...................\File-SynthesisOnly_StrTbl
.................\...............\...\...\............\...................\Library-SynthesisOnly
.................\...............\...\...\............\...................\Library-SynthesisOnly_StrTbl
.................\...............\...\...\............\...................

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