Hi When not driven by any driver on a star topology of an SSTL2 or HSTL signal, what would be the state of the output of input buffers which essentially compares the signal level to a Vref and during such conditions, the signal level is expected to be at mid level of Vtt = Vref. Request immediate help.... Thanks in advance.. Warm Regards J Srinivasan Maya is the beauty of existent and non-existent co-existing... ------------------------------------------------------------------ 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.org 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