alliance-support '2000
Re: SCR and ALU3


Ludovic JACOMME (Ludovic.JACOMME@asim.lip6.fr)
Tue, 27 Jun 2000 09:42:49 +0200

Hi Christian, On Mon, Jun 26, 2000 at 11:32:29PM -0700, MICHON Christian wrote: > Hi, > > I tried (again) to make use of amg but this time with > P&R trial (SCR). I managed through sed to do a temp > fix > of the vss/vdd line swap. Please use the Makefile > attached to reproduce my experiments. > > I realized through the tutorials that in Alliance only > ALU1/2 are used, at of course a cost in terms of die > area. So I wanted to try with a 3rd metal. Went inside > the sources of SCR to understand a bit, and understood > that there is a SCR_L3MODE env variable that controls > this... As far as i know, you're the first one who tries to use this option ;-) (I've never heard about it ...) > > But, while doing this, a few problems occurred: > 1- the sxlib cells once placed are inverted every row, > without taking care of DRUC nwell rules. > 2- the central power stripe should be alternate too, > but remains regular (as if with only ALU1/2). This is > detected at LVS. > > I'm not always getting the same results (looks random > to me), but I can confirm DRC/LVS problems with this > Makefile. And the die size is smaller by almost 50%... > > Did I trigger some hidden option not debugged yet ? > Is there another way to force SCR to use ALU3 ? You're right, it's an hidden option and i think never debugged ... > > I saw somewhere (Ludo's page ?) that an OCR is on its > way... I hope to see it available soon. Overall, your > tools are quite **impressive**. I'll ask authors of OCR in order to give you a beta-version > > With best regards, > Christian. > We stay in contact, Regards, Ludo. (_) ___ Ludovic JACOMME _ _ ( ) ( ) ( ) ( 6 ) Laboratoire LIP6, Equipe ASIM ( ) (_) ( _ ) Couloir 55-65, 2eme etage, ( )___ ( ) Universite P. et M. Curie (P6) (_____) (_) 4 place Jussieu, 75252 Paris Cedex 05 Tel: (33) 01.44.27.54.15 Fax: (33) 01.44.27.72.80 ICQ: 62526530 mailto: Ludovic.Jacomme@asim.lip6.fr http: //asim.lip6.fr/~ludo

 



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