Hi there, Pls how do I use the 'flatlo' tool. I read from the previous help issues its used for flattening hierarchial descriptions. I get these errors: *** mbk warning *** lofigchain is missing on lofig twobit1. *** mbk error *** can't open file : na4_x1.vst Heres my path settings: export MBK_IN_LO=vst export MBK_OUT_LO=vst export MBK_IN_PH=ap export MBK_OUT_PH=ap export MBK_CATAL_NAME=CATAL export MBK_WORK_LIB=. source /usr/local/alliance/share/etc/alc_env.sh and my path was set as: export MBK_CATA_LIB=$ALLIANCE_TOP/cells/sxlib I also used the above's combination with sc2sxlib. and heres my instruction: flatlo -t addopt1 addflat addopt1.vst is a structural description of of a 4-bit adder and it contains no pads. It is not heirarchial. pls advise Giie --------------------------------- Do You Yahoo!? Send FREE video emails in Yahoo! Mail.