use VHDL to implement USB protocol, which can be used in CPLD or FPGA

USB\FPGA\db\altsyncram_2i14.tdf
...\....\..\altsyncram_4rv3.tdf
...\....\..\altsyncram_ts14.tdf
...\....\..\cmpr_efc.tdf
...\....\..\cmpr_ifc.tdf
...\....\..\cmpr_j4c.tdf
...\....\..\cmpr_n4c.tdf
...\....\..\cntr_5fi.tdf
...\....\..\cntr_78j.tdf
...\....\..\cntr_a4i.tdf
...\....\..\cntr_cti.tdf
...\....\..\cntr_mdi.tdf
...\....\..\cntr_p1j.tdf
...\....\..\cntr_r2i.tdf
...\....\..\cntr_umi.tdf
...\....\..\decode_4uf.tdf
...\....\..\decode_9jf.tdf
...\....\..\logic_util_heursitic.dat
...\....\..\mux_irc.tdf
...\....\..\mux_ngc.tdf
...\....\..\prev_cmp_USB_LED.qmsg
...\....\..\USB_LED.amm.cdb
...\....\..\USB_LED.analyze_file.qmsg
...\....\..\USB_LED.asm.qmsg
...\....\..\USB_LED.asm.rdb
...\....\..\USB_LED.cbx.xml
...\....\..\USB_LED.cmp.kpt
...\....\..\USB_LED.cmp.rdb
...\....\..\USB_LED.cmp_merge.kpt
...\....\..\USB_LED.cuda_io_sim_cache.31um_ff_1200mv_0c_fast.hsd
...\....\..\USB_LED.cuda_io_sim_cache.31um_ss_1200mv_85c_slow.hsd
...\....\..\USB_LED.db_info
...\....\..\USB_LED.fit.qmsg
...\....\..\USB_LED.hier_info
...\....\..\USB_LED.hif
...\....\..\USB_LED.idb.cdb
...\....\..\USB_LED.lpc.html
...\....\..\USB_LED.lpc.rdb
...\....\..\USB_LED.lpc.txt
...\....\..\USB_LED.map.cdb
...\....\..\USB_LED.map.hdb
...\....\..\USB_LED.map.kpt
...\....\..\USB_LED.map.logdb
...\....\..\USB_LED.map.qmsg
...\....\..\USB_LED.pre_map.cdb
...\....\..\USB_LED.pre_map.hdb
...\....\..\USB_LED.rtlv.hdb
...\....\..\USB_LED.rtlv_sg.cdb
...\....\..\USB_LED.rtlv_sg_swap.cdb
...\....\..\USB_LED.sgdiff.cdb
...\....\..\USB_LED.sgdiff.hdb
...\....\..\USB_LED.sld_design_entry.sci
...\....\..\USB_LED.sld_design_entry_dsc.sci
...\....\..\USB_LED.smart_action.txt
...\....\..\USB_LED.sta.qmsg
...\....\..\USB_LED.sta.rdb
...\....\..\USB_LED.syn_hier_info
...\....\..\USB_LED.tis_db_list.ddb
...\....\greybox_tmp\cbx_args.txt
...\....\incremental_db\compiled_partitions\USB_LED.autoh_e4eb1.map.cdb
...\....\..............\...................\USB_LED.autoh_e4eb1.map.dpi
...\....\..............\...................\USB_LED.autoh_e4eb1.map.hdb
...\....\..............\...................\USB_LED.autoh_e4eb1.map.kpt
...\....\..............\...................\USB_LED.autoh_e4eb1.map.logdb
...\....\..............\...................\USB_LED.autos_3e921.map.cdb
...\....\..............\...................\USB_LED.autos_3e921.map.dpi
...\....\..............\...................\USB_LED.autos_3e921.map.hdb
...\....\..............\...................\USB_LED.autos_3e921.map.kpt
...\....\..............\...................\USB_LED.autos_3e921.map.logdb
...\....\..............\...................\USB_LED.db_info
...\....\..............\...................\USB_LED.root_partition.cmp.cdb
...\....\..............\...................\USB_LED.root_partition.cmp.dfp
...\....\..............\...................\USB_LED.root_partition.cmp.hdb
...\....\..............\...................\USB_LED.root_partition.cmp.kpt
...\....\..............\...................\USB_LED.root_partition.cmp.logdb
...\....\..............\...................\USB_LED.root_partition.cmp.rcfdb
...\....\..............\...................\USB_LED.root_partition.map.cdb
...\....\..............\...................\USB_LED.root_partition.map.dpi
...\....\..............\...................\USB_LED.root_partition.map.hbdb.cdb
...\....\..............\...................\USB_LED.root_partition.map.hbdb.hb_info
...\....\..............\...................\USB_LED.root_partition.map.hbdb.hdb
...\....\..............\...................\USB_LED.root_partition.map.hbdb.sig
...\....\..............\...................\USB_LED.root_partition.map.hdb
...\....\..............\...................\USB_LED.root_partition.map.kpt
...\....\..............\README
...\....\PLL.cmp
...\....\PLL.ppf
...\....\PLL.qip
...\....\PLL.vhd
...\....\PLL.vhd.bak
...\....\slavefifo_rd.vhd
...\....\slavefifo_rd.vhd.bak
...\....\stp1.stp
...\....\transcript
...\....\USB_LED.asm.rpt
...\....\USB_LED.bdf
...\....\USB_LED.bsf
...\....\USB_LED.cdf
...\....\USB_LED.done
...\....\USB_LED.fit.rpt

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