Case of the method of components to achieve a frequency meter design, the use of the Verilog language, to achieve a more accurate frequency measurement function, the maximum measurement frequency of up to 50M or so.

instance_f_meter
................\clk50MHz_to_1Hz.v
................\control.v
................\count10.v
................\count10.v.bak
................\db
................\..\f_meter.asm.qmsg
................\..\f_meter.asm_labs.ddb
................\..\f_meter.cbx.xml
................\..\f_meter.cmp.bpm
................\..\f_meter.cmp.cdb
................\..\f_meter.cmp.ecobp
................\..\f_meter.cmp.hdb
................\..\f_meter.cmp.kpt
................\..\f_meter.cmp.logdb
................\..\f_meter.cmp.rdb
................\..\f_meter.cmp.tdb
................\..\f_meter.cmp0.ddb
................\..\f_meter.cmp_merge.kpt
................\..\f_meter.db_info
................\..\f_meter.eco.cdb
................\..\f_meter.fit.qmsg
................\..\f_meter.hier_info
................\..\f_meter.hif
................\..\f_meter.lpc.html
................\..\f_meter.lpc.rdb
................\..\f_meter.lpc.txt
................\..\f_meter.map.bpm
................\..\f_meter.map.cdb
................\..\f_meter.map.ecobp
................\..\f_meter.map.hdb
................\..\f_meter.map.kpt
................\..\f_meter.map.logdb
................\..\f_meter.map.qmsg
................\..\f_meter.map_bb.cdb
................\..\f_meter.map_bb.hdb
................\..\f_meter.map_bb.logdb
................\..\f_meter.pre_map.cdb
................\..\f_meter.pre_map.hdb
................\..\f_meter.rpp.qmsg
................\..\f_meter.rtlv.hdb
................\..\f_meter.rtlv_sg.cdb
................\..\f_meter.rtlv_sg_swap.cdb
................\..\f_meter.sgate.rvd
................\..\f_meter.sgate_sm.rvd
................\..\f_meter.sgdiff.cdb
................\..\f_meter.sgdiff.hdb
................\..\f_meter.sld_design_entry.sci
................\..\f_meter.sld_design_entry_dsc.sci
................\..\f_meter.syn_hier_info
................\..\f_meter.tan.qmsg
................\..\f_meter.tis_db_list.ddb
................\..\f_meter_global_asgn_op.abo
................\..\prev_cmp_f_meter.asm.qmsg
................\..\prev_cmp_f_meter.fit.qmsg
................\..\prev_cmp_f_meter.map.qmsg
................\..\prev_cmp_f_meter.qmsg
................\..\prev_cmp_f_meter.tan.qmsg
................\f_meter.asm.rpt
................\f_meter.done
................\f_meter.dpf
................\f_meter.fit.rpt
................\f_meter.fit.smsg
................\f_meter.fit.summary
................\f_meter.flow.rpt
................\f_meter.map.rpt
................\f_meter.map.smsg
................\f_meter.map.summary
................\f_meter.pin
................\f_meter.pof
................\f_meter.qpf
................\f_meter.qsf
................\f_meter.qws
................\f_meter.sof
................\f_meter.tan.rpt
................\f_meter.tan.summary
................\f_meter.v
................\f_meter.v.bak
................\f_meter_assignment_defaults.qdf
................\incremental_db
................\..............\compiled_partitions
................\..............\...................\f_meter.root_partition.cmp.atm
................\..............\...................\f_meter.root_partition.cmp.dfp
................\..............\...................\f_meter.root_partition.cmp.hdbx
................\..............\...................\f_meter.root_partition.cmp.kpt
................\..............\...................\f_meter.root_partition.cmp.logdb
................\..............\...................\f_meter.root_partition.cmp.rcf
................\..............\...................\f_meter.root_partition.map.atm
................\..............\...................\f_meter.root_partition.map.dpi
................\..............\...................\f_meter.root_partition.map.hdbx
................\..............\...................\f_meter.root_partition.map.kpt
................\..............\README
................\latch_my.v
................\led_display.v
................\led_display.v.bak
................\newpin.tcl
................\本程序使用说明.txt

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