alliance-support '2000
TROUBLES WITH LOON


Gianluca Cornetta (cornetta@ac.upc.es)
Wed, 13 Sep 2000 15:14:42 +0200 (MET DST)

Hi, I am having trouble with Loon. I have no idea of how configuring the environment in order to make it work. This is what appears when I try to optimize the circuit named VDC53: Reading default parameter... 100% delay optimization Reading file '../workdir/chip/counters/vdc53.vst'... Reading lib '/users2/scratch/cornetta/alliance/archi/Solaris/cells/cplsxlib'... Mapping Warning: Cell 'xxn2_sync' unused Mapping Warning: Cell 'xorxnor2' unused Mapping Warning: Cell 'tie_y' unused Mapping Warning: Cell 'rowend_x0' unused Mapping Warning: Cell 'ornor2' unused Mapping Warning: Cell 'oon2_sync' unused Mapping Warning: Cell 'mux4' unused Mapping Warning: Cell 'mux2' unused Mapping Warning: Cell 'andnand2' unused Mapping Warning: Cell 'aan2_sync' unused Mapping Warning: Cell 'ao' unused Capacitances on file '../workdir/chip/counters/vdc53.vst'... library error: no model 'mux4.vbe' found So I have some questions to do: 1) in the vbe behavioural description of each library cell there is an header with pull-up and pull-down resistances, input capacitances and propagation delays. In wich units are expressed these parameters? 2)Are these data utilized by Loon or by Hitas? 3)In the output I read "Capacitances on file '../workdir/chip/counters/vdc53.vst'.." However this file only contains a structural description of the circuit but no capacitance, shall I create a file with capacitances? How can I do this? 4)I also read "library error: no model 'mux4.vbe' found" but the vbe file exists To what should be this problem due? Moreover I changed the pitch of the cells from 6lambdas to 5lambdas however the router still doesn't work very well (but better than before). In fact as I told you before I designed a library of differencial cells but the router only recognizes one output and ignores the other. Do you know a way to force the router to route all the outputs. I have noted that in the .al descrption of a cell generated by lynx both inputs and outputs are classified as UNKNOWN if I specify the correct pin direction in the .al file will things work? Supposing that there is no way to make the automatic routing of the second inputs of the differential cells and that this must be done by hand, is it possible to do a hierarchical routing, that is generating the layouts of the counters separately and then ensemble them to form the multiplier? Does loon recognize cells with two outputs? Thank you for your help and your patience. Best regards, --Gianluca

 



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