procedure was used in hardware description language (VHDL) to achieve : 4* 4 keyboard scan, concise, easily understood and more suitable for beginners VHDL

KEY_SCAN
........\BCD_BIN.vhd
........\BL.vhd
........\cmp_state.ini
........\db
........\..\add_sub_9nh.tdf
........\..\add_sub_anh.tdf
........\..\add_sub_cnh.tdf
........\..\add_sub_toh.tdf
........\..\KEY_SCAN.asm.qmsg
........\..\KEY_SCAN.cmp.cdb
........\..\KEY_SCAN.cmp.ddb
........\..\KEY_SCAN.cmp.hdb
........\..\KEY_SCAN.cmp.rdb
........\..\KEY_SCAN.cmp.tdb
........\..\KEY_SCAN.cmp0.ddb
........\..\KEY_SCAN.db_info
........\..\KEY_SCAN.eco.cdb
........\..\KEY_SCAN.eds_overflow
........\..\KEY_SCAN.fit.qmsg
........\..\KEY_SCAN.fnsim.hdb
........\..\KEY_SCAN.hier_info
........\..\KEY_SCAN.hif
........\..\KEY_SCAN.icc
........\..\KEY_SCAN.map.cdb
........\..\KEY_SCAN.map.hdb
........\..\KEY_SCAN.map.qmsg
........\..\KEY_SCAN.pre_map.cdb
........\..\KEY_SCAN.pre_map.hdb
........\..\KEY_SCAN.psp
........\..\KEY_SCAN.rtlv.hdb
........\..\KEY_SCAN.rtlv_sg.cdb
........\..\KEY_SCAN.rtlv_sg_swap.cdb
........\..\KEY_SCAN.sgdiff.cdb
........\..\KEY_SCAN.sgdiff.hdb
........\..\KEY_SCAN.sim.hdb
........\..\KEY_SCAN.sim.qmsg
........\..\KEY_SCAN.sim.rdb
........\..\KEY_SCAN.sld_design_entry.sci
........\..\KEY_SCAN.sld_design_entry_dsc.sci
........\..\KEY_SCAN.syn_hier_info
........\..\KEY_SCAN.tan.qmsg
........\..\KEY_SCAN_cmp.qrpt
........\..\KEY_SCAN_sim.qrpt
........\..\mux_19c.tdf
........\..\mux_s8c.tdf
........\FPGA_S51_0.bsf
........\fpga_s51_0.vhd
........\FPGA_S51_0.vwf
........\key.vhd
........\Keyboard.bsf
........\Keyboard.vhd
........\Keyboard.vwf
........\KEY_SCAN.asm.rpt
........\KEY_SCAN.bdf
........\KEY_SCAN.bsf
........\KEY_SCAN.done
........\KEY_SCAN.fit.eqn
........\KEY_SCAN.fit.rpt
........\KEY_SCAN.fit.summary
........\KEY_SCAN.flow.rpt
........\KEY_SCAN.map.eqn
........\KEY_SCAN.map.rpt
........\KEY_SCAN.map.summary
........\KEY_SCAN.pin
........\KEY_SCAN.pof
........\KEY_SCAN.qpf
........\KEY_SCAN.qsf
........\KEY_SCAN.qws
........\KEY_SCAN.sim.rpt
........\KEY_SCAN.sof
........\KEY_SCAN.tan.rpt
........\KEY_SCAN.tan.summary
........\KEY_SCAN.vwf
........\KEY_SCAN_assignment_defaults.qdf
........\KEY_SCAN_lie.bdf
........\KEY_SCAN_lie.vwf
........\MUL_10.inc
........\MUL_10.vhd

........\MUL_10_waveforms.html
........\out_hang.bsf
........\out_hang.vhd
........\OUT_HANG2.bsf
........\out_hang2.vhd
........\out_hang2.vwf
........\pailie.bsf
........\pailie.vhd
........\pailie.vwf
........\read_lie.bsf
........\READ_LIE.vhd
........\sim.cfg

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