The design is to achieve a 4*4 matrix keyboard design, the matrix keys to the value of the button to send to the host computer through the serial port

key_board
.........\clkdiv.bsf
.........\clkdiv.vhd
.........\db
.........\..\key_board.asm.qmsg
.........\..\key_board.asm_labs.ddb
.........\..\key_board.cbx.xml
.........\..\key_board.cmp.bpm
.........\..\key_board.cmp.cdb
.........\..\key_board.cmp.ecobp
.........\..\key_board.cmp.hdb
.........\..\key_board.cmp.kpt
.........\..\key_board.cmp.logdb
.........\..\key_board.cmp.rdb
.........\..\key_board.cmp.tdb
.........\..\key_board.cmp0.ddb
.........\..\key_board.cmp2.ddb
.........\..\key_board.cmp_merge.kpt
.........\..\key_board.db_info
.........\..\key_board.eco.cdb
.........\..\key_board.eds_overflow
.........\..\key_board.fit.qmsg
.........\..\key_board.fnsim.cdb
.........\..\key_board.fnsim.hdb
.........\..\key_board.fnsim.qmsg
.........\..\key_board.hier_info
.........\..\key_board.hif
.........\..\key_board.lpc.html
.........\..\key_board.lpc.rdb
.........\..\key_board.lpc.txt
.........\..\key_board.map.bpm
.........\..\key_board.map.cdb
.........\..\key_board.map.ecobp
.........\..\key_board.map.hdb
.........\..\key_board.map.kpt
.........\..\key_board.map.logdb
.........\..\key_board.map.qmsg
.........\..\key_board.map_bb.cdb
.........\..\key_board.map_bb.hdb
.........\..\key_board.map_bb.logdb
.........\..\key_board.pre_map.cdb
.........\..\key_board.pre_map.hdb
.........\..\key_board.rtlv.hdb
.........\..\key_board.rtlv_sg.cdb
.........\..\key_board.rtlv_sg_swap.cdb
.........\..\key_board.sgdiff.cdb
.........\..\key_board.sgdiff.hdb
.........\..\key_board.sim.cvwf
.........\..\key_board.sim.hdb
.........\..\key_board.sim.qmsg
.........\..\key_board.sim.rdb
.........\..\key_board.simfam
.........\..\key_board.sld_design_entry.sci
.........\..\key_board.sld_design_entry_dsc.sci
.........\..\key_board.syn_hier_info
.........\..\key_board.tan.qmsg
.........\..\key_board.tis_db_list.ddb
.........\..\key_board.tmw_info
.........\..\key_board_global_asgn_op.abo
.........\..\mux_joc.tdf
.........\..\prev_cmp_key_board.asm.qmsg
.........\..\prev_cmp_key_board.fit.qmsg
.........\..\prev_cmp_key_board.map.qmsg
.........\..\prev_cmp_key_board.qmsg
.........\..\prev_cmp_key_board.sim.qmsg
.........\..\prev_cmp_key_board.tan.qmsg
.........\..\wed.wsf
.........\incremental_db
.........\..............\README
.........\..............\compiled_partitions
.........\..............\...................\key_board.root_partition.cmp.atm
.........\..............\...................\key_board.root_partition.cmp.dfp
.........\..............\...................\key_board.root_partition.cmp.hdbx
.........\..............\...................\key_board.root_partition.cmp.kpt
.........\..............\...................\key_board.root_partition.cmp.logdb
.........\..............\...................\key_board.root_partition.cmp.rcf
.........\..............\...................\key_board.root_partition.map.atm
.........\..............\...................\key_board.root_partition.map.dpi
.........\..............\...................\key_board.root_partition.map.hdbx
.........\..............\...................\key_board.root_partition.map.kpt
.........\key.bsf
.........\key.vhd
.........\key_board.asm.rpt
.........\key_board.bdf
.........\key_board.done
.........\key_board.dpf
.........\key_board.fit.rpt
.........\key_board.fit.smsg
.........\key_board.fit.summary
.........\key_board.flow.rpt
.........\key_board.map.rpt
.........\key_board.map.summary
.........\key_board.pin
.........\key_board.pof
.........\key_board.qpf
.........\key_board.qsf
.........\key_board.qws
.........\key_board.sim.rpt
.........\key_board.sof
.........\key_board.tan.rpt

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