Drive four common cathode LED digital display circuit as shown. This circuit uses dynamic scanning display technology, when the scan signal frequency is greater than 50Hz, you can display a stable four digital. Try using FPGA device design the circuit. Write VHDL program for each module and the corresponding EDA simulation tools for simulation.

ex2
...\counter.bsf
...\data_select.bsf
...\db
...\..\ex2.cbx.xml
...\..\ex2.cmp.rdb
...\..\ex2.db_info
...\..\ex2.hif
...\..\ex2.map.qmsg
...\..\ex2.map_bb.hdb
...\..\ex2.pre_map.hdb
...\..\ex2.sld_design_entry.sci
...\..\ex2.smart_action.txt
...\..\ex2.tis_db_list.ddb
...\..\logic_util_heursitic.dat
...\..\prev_cmp_ex2.qmsg
...\decoder.bsf
...\display_decoder.bsf
...\ex2.bdf
...\ex2.done
...\ex2.flow.rpt
...\ex2.map.rpt
...\ex2.map.summary
...\ex2.qpf
...\ex2.qsf

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