<div dir="ltr">Hi Jason,<div><br></div><div>Your general understanding is correct. The phy capabilities TX SSC TYPE bit indicates the SSC type (i.e., center-spreading or down-spreading). This allowed a product that is connected to optimize the Rx to receive SSC if they desire. The term "may" indicates it "may or may not" without any preference. The optimization is optional. If the configuration bits also indicate operation "with SSC" the requirement is the receiver be compliant even in the presence of the full SSC deviation advertised by the TX SSC TYPE bit. The rules for initiator center-spread and target down-spread are specified elsewhere in the standard and this is the expected operation. </div><div><br></div><div>In the wording of your question, "Is that mean RX should ensure..." you have used the term should, where in this case in spec language this is a shall. The term should indicates a flexibility of choice but once you indicate support for SSC it is a requirement to be fully compliant in the presence of SSC. It is the optimization that is optional. </div><div><br></div><div>Regards,<br>Harvey Newman</div><div>Avago Technologies</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Oct 22, 2015 at 11:19 PM, Guojian (F) <span dir="ltr"><<a href="mailto:guojian111@hisilicon.com" target="_blank">guojian111@hisilicon.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="ZH-CN" link="blue" vlink="purple">
<div>
<p class="MsoNormal"><span lang="EN-US">Hi,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> I have a question about SAS SSC.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> From the attached Picture, we can see that initiator and target would notify each other TX SSC TYPE by transmitting SNW-3 phy capabilities.<u></u><u></u></span></p>
<p class="MsoNormal" align="left" style="text-align:left;text-autospace:none"><span lang="EN-US">
</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial","sans-serif";color:red">NOTE 13 - The phy’s receiver may use the
</span><span lang="EN-US" style="font-size:7.0pt;font-family:"Arial","sans-serif";color:red">TX SSC TYPE
</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial","sans-serif";color:red">bit to optimize its clock data recovery circuitry (seeSAS-3).<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> Is that means RX should ensure it can receive center-spreading SSC or down-spreading SSC signal by using received TX SSC TYPE?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> So, it is possible that initiator transmit center-spreading SSC signal and target transmit down-spreading SSC signal. Is that right?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks and Best Regards!<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Jason Guo<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><img width="983" height="590" src="cid:image001.png@01D10D07.477BC180"></span><span lang="EN-US"><u></u><u></u></span></p>
</div>
</div>
<br>_______________________________________________<br>
T10 mailing list<br>
<a href="mailto:T10@t10.org">T10@t10.org</a><br>
<a href="http://www.t10.org/mailman/listinfo/t10" rel="noreferrer" target="_blank">http://www.t10.org/mailman/listinfo/t10</a><br>
<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr">Harvey Newman<div>Avago Technologies</div><div>(408) 433-4028</div></div></div>
</div>