HI, This is regarding SGMII PHY again. Is there any Specification for input setuptime(minimum) for SGMII PHY since data has to be latched by using clock. At the Tx end the Clock is placed at the middle of data. So due to the noise and jitter the alignment of clock-data will change at Rx end which may violate setup/hold time at the Rx end. I have not seenany such spec. If anyone knows please help me. With regards, Gunjan --- Gunjan Mandal <gunjan_mandal@xxxxxxxxx> wrote: > Hi, > I am writing e-mail regarding the system level > understanding of SGMII PHY. > > I am doing the design of LVDS RX to be used for > SGMII > PHY. > Could any one please answers my following queries: > > 1)Can there be any difference in differential > voltage > levels (VID) for clock and the data signals at the > RX > end provided they are coming from similar kind of > transmitter (@ 1.3 GB/S)? > If it is there can it be like this : > Clock-VID=100mv > Data-VID=400mv > What is the system level scenario? > > 2) Can there be situation where the clock signal is > having common mode of 2.2v and the data signal is > having common mode of 0.2v? > > As per the IEEE spec the common variation comes due > to > the Ground potential difference between Tx and Rx. > So, it should be same for data and clock as they are > coming from same chip. > > How much the Common mode can differ between data > and > clock due to noise? > > I will look forward for the answers. > With regards, > Gunjan > > > > __________________________________ > Do you Yahoo!? > New and Improved Yahoo! Mail - Send 10MB messages! > http://promotions.yahoo.com/new_mail > ------------------------------------------------------------------ > 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 FAQ wiki page is located at: > > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > > 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 > > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ 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