It is written in their own dds source, using a lookup table method, pro-test available.

dds\altaccumulate0.bsf
...\altaccumulate0.cmp
...\altaccumulate0.inc
...\altaccumulate0.qip
...\altaccumulate0.vhd
...\altaccumulate0_inst.vhd
...\altaccumulate0_syn.v
...\altaccumulate0_wave0.jpg
...\altaccumulate0_waveforms.html
...\db\altsyncram_0eq1.tdf
...\..\altsyncram_2891.tdf
...\..\altsyncram_3g82.tdf
...\..\altsyncram_aeq1.tdf
...\..\altsyncram_al91.tdf
...\..\altsyncram_bt82.tdf
...\..\altsyncram_cbq1.tdf
...\..\altsyncram_hps3.tdf
...\..\altsyncram_pms3.tdf
...\..\altsyncram_rps3.tdf
...\..\altsyncram_rt81.tdf
...\..\altsyncram_s582.tdf
...\..\altsyncram_tms3.tdf
...\..\cmpr_5cc.tdf
...\..\cmpr_8cc.tdf
...\..\cmpr_9cc.tdf
...\..\cmpr_acc.tdf
...\..\cntr_02j.tdf
...\..\cntr_0ci.tdf
...\..\cntr_1ci.tdf
...\..\cntr_45j.tdf
...\..\cntr_48j.tdf
...\..\cntr_fai.tdf
...\..\cntr_gui.tdf
...\..\cntr_sbi.tdf
...\..\cntr_ubi.tdf
...\..\cntr_v1j.tdf
...\..\dds.asm.qmsg
...\..\dds.asm_labs.ddb
...\..\dds.cbx.xml
...\..\dds.cmp.bpm
...\..\dds.cmp.cdb
...\..\dds.cmp.ecobp
...\..\dds.cmp.hdb
...\..\dds.cmp.kpt
...\..\dds.cmp.logdb
...\..\dds.cmp.rdb
...\..\dds.cmp.tdb
...\..\dds.cmp0.ddb
...\..\dds.cmp2.ddb
...\..\dds.cmp_merge.kpt
...\..\dds.db_info
...\..\dds.eco.cdb
...\..\dds.eda.qmsg
...\..\dds.eds_overflow
...\..\dds.fit.qmsg
...\..\dds.fnsim.hdb
...\..\dds.fnsim.qmsg
...\..\dds.hier_info
...\..\dds.hif
...\..\dds.lpc.html
...\..\dds.lpc.rdb
...\..\dds.lpc.txt
...\..\dds.map.bpm
...\..\dds.map.cdb
...\..\dds.map.ecobp
...\..\dds.map.hdb
...\..\dds.map.kpt
...\..\dds.map.logdb
...\..\dds.map.qmsg
...\..\dds.map.rcf
...\..\dds.map_bb.cdb
...\..\dds.map_bb.hdb
...\..\dds.map_bb.logdb
...\..\dds.merge.qmsg
...\..\dds.pre_map.cdb
...\..\dds.pre_map.hdb
...\..\dds.rtlv.hdb
...\..\dds.rtlv_sg.cdb
...\..\dds.rtlv_sg_swap.cdb
...\..\dds.sgdiff.cdb
...\..\dds.sgdiff.hdb
...\..\dds.sim.hdb
...\..\dds.sim.qmsg
...\..\dds.simfam
...\..\dds.sim_ori.vwf
...\..\dds.sld_design_entry.sci
...\..\dds.sld_design_entry_dsc.sci
...\..\dds.syn_hier_info
...\..\dds.tan.qmsg
...\..\dds.tis_db_list.ddb
...\..\decode_opa.tdf
...\..\decode_rqf.tdf
...\..\lpm_constant_4e6.tdf
...\..\lpm_constant_li6.tdf
...\..\lpm_constant_mi6.tdf
...\..\lpm_constant_ui6.tdf
...\..\mux_9kb.tdf
...\..\mux_aoc.tdf
...\..\mux_boc.tdf
...\..\mux_coc.tdf

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