Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: 7bit Hello, when I use IBIS model for si analysis,comparing IBIS model to I\O HSPICE model of altera's Stratix_II_GX FPGA,I find that the output signal of IBIS delays more at fall edge than at rise.In the picture,white line is the input signal,blue line is the output signal of IBIS model and red line is the output signal of Hspice model.The load conditions are both same in simulations. what happened in my simulation?can anybody tell me the reason ? 2009-10-22 Best regards wei.liu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu