I'm not familiar with the particulars for this case ... but it sounds like you ought to use a 133MHz frequency clock for the strobe, and 133MHz for the data as well, which would simulate the case with alternating 1's and 0's. The data changes at a 266MHz bit rate (266 Mbit/sec), so the fastest it can switch looks like a 133MHz square wave (one high and one low bit per 133MHz cycle). However, alternating 1's and 0's is just one case, and real data doesn't do that for long. Also try patterns like 11001100 (66MHz square wave), 1110111, etc. Regards, Andy ------------------------------------------------------------------ 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 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