CPLD/FPGA, VHDL language keyboard button scanning, keyboard scanning procedures

KEY4X4_1
........\MAXII240_570T100C5N_PIN.tcl
........\db
........\..\key_test.asm.qmsg
........\..\key_test.cbx.xml
........\..\key_test.cmp.cdb
........\..\key_test.cmp.hdb
........\..\key_test.cmp.logdb
........\..\key_test.cmp.rdb
........\..\key_test.cmp.tdb
........\..\key_test.cmp0.ddb
........\..\key_test.db_info
........\..\key_test.dbp
........\..\key_test.eco.cdb
........\..\key_test.fit.qmsg
........\..\key_test.hier_info
........\..\key_test.hif
........\..\key_test.map.cdb
........\..\key_test.map.hdb
........\..\key_test.map.logdb
........\..\key_test.map.qmsg
........\..\key_test.pre_map.cdb
........\..\key_test.pre_map.hdb
........\..\key_test.psp
........\..\key_test.pss
........\..\key_test.rtlv.hdb
........\..\key_test.rtlv_sg.cdb
........\..\key_test.rtlv_sg_swap.cdb
........\..\key_test.sgdiff.cdb
........\..\key_test.sgdiff.hdb
........\..\key_test.signalprobe.cdb
........\..\key_test.sld_design_entry.sci
........\..\key_test.sld_design_entry_dsc.sci
........\..\key_test.syn_hier_info
........\..\key_test.tan.qmsg
........\..\key_test.tis_db_list.ddb
........\..\prev_cmp_key_test.asm.qmsg
........\..\prev_cmp_key_test.fit.qmsg
........\..\prev_cmp_key_test.map.qmsg
........\..\prev_cmp_key_test.qmsg
........\..\prev_cmp_key_test.tan.qmsg
........\hc164_driver.bsf
........\hc164_driver.vhd
........\key_scan.bsf
........\key_scan.vhd
........\key_test.asm.rpt
........\key_test.bdf
........\key_test.cdf
........\key_test.done
........\key_test.fit.rpt
........\key_test.fit.smsg
........\key_test.fit.summary
........\key_test.flow.rpt
........\key_test.map.rpt
........\key_test.map.summary
........\key_test.pin
........\key_test.pof
........\key_test.qpf
........\key_test.qsf
........\key_test.qws
........\key_test.tan.rpt
........\key_test.tan.summary
........\说明.txt

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