Hi , I have following two stack up's Stack 'A' 1)Signal 2)PWR 3)GND 4)Signal 5)PWR 6)Signal 7)Signal 8)Gnd 9)Signal 10)PWR 11)GND 12)Signal Stack 'B' 1)Signal 2)GND 3)Signal 4)Signal 5)Ground 6)Power 7)Power 8)GND 9)Signal 10)Signal 11)PWR 12)Signal Intent is to use one of these stacks for an FPGA based high speed Design (Max 133 Mhz). Can i know which one is preferable. regards Sunil.B ------------------------------------------------------------------ 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