To achieve a plus/minus 8 binary counter. These include the clock input enable signal, addition and subtraction control signals, reset signals, three inputs and a carry bit.

example3
........\counter.asm.rpt
........\counter.cdf
........\counter.done
........\counter.dpf
........\counter.fit.rpt
........\counter.fit.smsg
........\counter.fit.summary
........\counter.flow.rpt
........\counter.map.rpt
........\counter.map.summary
........\counter.pin
........\counter.pof
........\counter.qpf
........\counter.qsf
........\counter.qws
........\counter.tan.rpt
........\counter.tan.summary
........\counter.vhd
........\counter_assignment_defaults.qdf
........\db
........\..\counter.db_info
........\..\counter.eco.cdb
........\..\counter.sld_design_entry.sci
........\实验说明.txt

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