4* 4 matrix keyboard, crystal 20MHZ, plus the delay, I personally experiments realized in the CPLD.

4_4_key\44键盘扫描电路设计\44key\clk_gen.inc
.......\..................\.....\clk_gen.vhd
.......\..................\.....\db\key_44.asm.qmsg
.......\..................\.....\..\key_44.cbx.xml
.......\..................\.....\..\key_44.cmp.cdb
.......\..................\.....\..\key_44.cmp.hdb
.......\..................\.....\..\key_44.cmp.logdb
.......\..................\.....\..\key_44.cmp.rdb
.......\..................\.....\..\key_44.cmp.tdb
.......\..................\.....\..\key_44.cmp0.ddb
.......\..................\.....\..\key_44.db_info
.......\..................\.....\..\key_44.eco.cdb
.......\..................\.....\..\key_44.fit.qmsg
.......\..................\.....\..\key_44.hier_info
.......\..................\.....\..\key_44.hif
.......\..................\.....\..\key_44.map.cdb
.......\..................\.....\..\key_44.map.hdb
.......\..................\.....\..\key_44.map.logdb
.......\..................\.....\..\key_44.map.qmsg
.......\..................\.....\..\key_44.pre_map.cdb
.......\..................\.....\..\key_44.pre_map.hdb
.......\..................\.....\..\key_44.rpp.qmsg
.......\..................\.....\..\key_44.rtlv.hdb
.......\..................\.....\..\key_44.rtlv_sg.cdb
.......\..................\.....\..\key_44.rtlv_sg_swap.cdb
.......\..................\.....\..\key_44.sgate.rvd
.......\..................\.....\..\key_44.sgate_sm.rvd
.......\..................\.....\..\key_44.sgdiff.cdb
.......\..................\.....\..\key_44.sgdiff.hdb
.......\..................\.....\..\key_44.sld_design_entry.sci
.......\..................\.....\..\key_44.sld_design_entry_dsc.sci
.......\..................\.....\..\key_44.syn_hier_info
.......\..................\.....\..\key_44.tan.qmsg
.......\..................\.....\..\key_44.tis_db_list.ddb
.......\..................\.....\..\key_44.tmw_info
.......\..................\.....\..\prev_cmp_key_44.asm.qmsg
.......\..................\.....\..\prev_cmp_key_44.fit.qmsg
.......\..................\.....\..\prev_cmp_key_44.map.qmsg
.......\..................\.....\..\prev_cmp_key_44.qmsg
.......\..................\.....\..\prev_cmp_key_44.tan.qmsg
.......\..................\.....\key44_xiaod.vhd
.......\..................\.....\key_44.asm.rpt
.......\..................\.....\key_44.done
.......\..................\.....\key_44.fit.rpt
.......\..................\.....\key_44.fit.summary
.......\..................\.....\key_44.flow.rpt
.......\..................\.....\key_44.map.rpt
.......\..................\.....\key_44.map.summary
.......\..................\.....\key_44.pin
.......\..................\.....\key_44.pof
.......\..................\.....\key_44.qpf
.......\..................\.....\key_44.qsf
.......\..................\.....\key_44.qws
.......\..................\.....\key_44.tan.rpt
.......\..................\.....\key_44.tan.summary
.......\..................\.....\key_44.vhd
.......\..................\.....\key_scan.vhd
.......\..................\.....\key_yima.vhd
.......\..................\.....\xiaodou.vhd
.......\..................\db\add_sub_m9c.tdf
.......\..................\..\add_sub_n9c.tdf
.......\..................\..\add_sub_o9c.tdf
.......\..................\..\add_sub_p9c.tdf
.......\..................\..\altsyncram_4lu.tdf
.......\..................\..\altsyncram_ltu.tdf
.......\..................\..\altsyncram_otu.tdf
.......\..................\..\alt_u_div_i0f.tdf
.......\..................\..\alt_u_div_lke.tdf
.......\..................\..\keydesign.asm.qmsg
.......\..................\..\keydesign.cbx.xml
.......\..................\..\keydesign.cmp.cdb
.......\..................\..\keydesign.cmp.hdb
.......\..................\..\keydesign.cmp.logdb
.......\..................\..\keydesign.cmp.rdb
.......\..................\..\keydesign.cmp.tdb
.......\..................\..\keydesign.cmp0.ddb
.......\..................\..\keydesign.db_info
.......\..................\..\keydesign.eco.cdb
.......\..................\..\keydesign.fit.qmsg
.......\..................\..\keydesign.hier_info
.......\..................\..\ke

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