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<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal">Can you please clarify the following questions with respect to the XL state machine &nbsp;- XL1 to XL5 state transition:<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo3">Per Figure K.18: Why does Expander phy (Y) not have &#8220;Arbitrating Normal confirmation&#8221; from ECM ?&nbsp; Expander phy[X] has &#8220;Arbitrating Normal confirmation&#8221;<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo3">If we assume Expander Phy [X] and Expander Phy [Y] has the following state transitions:<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="margin-left:.5in;border-collapse:collapse">
<tbody>
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<td width="312" valign="top" style="width:233.75pt;border:solid windowtext 1.0pt;background:#BFBFBF;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoListParagraph" align="center" style="margin-left:0in;text-align:center">
<b>Expander phy [X]<o:p></o:p></b></p>
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<td width="360" valign="top" style="width:269.95pt;border:solid windowtext 1.0pt;border-left:none;background:#BFBFBF;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoListParagraph" align="center" style="margin-left:0in;text-align:center">
<b>Expander phy [Y] &#8211; <o:p></o:p></b></p>
<p class="MsoListParagraph" align="center" style="margin-left:0in;text-align:center">
<b>having higher priority Add frame received<o:p></o:p></b></p>
</td>
</tr>
<tr>
<td width="312" valign="top" style="width:233.75pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoListParagraph" align="center" style="margin-left:0in;text-align:center">
XL0: Idle<o:p></o:p></p>
</td>
<td width="360" valign="top" style="width:269.95pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoListParagraph" align="center" style="margin-left:0in;text-align:center">
XL0: Idle<o:p></o:p></p>
</td>
</tr>
<tr>
<td width="312" valign="top" style="width:233.75pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoListParagraph" align="center" style="margin-left:0in;text-align:center">
XL0: Idle -&gt; XL1:Request_Path<o:p></o:p></p>
</td>
<td width="360" valign="top" style="width:269.95pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoListParagraph" align="center" style="margin-left:0in;text-align:center">
XL0: Idle<o:p></o:p></p>
</td>
</tr>
<tr>
<td width="312" valign="top" style="width:233.75pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoListParagraph" align="center" style="margin-left:0in;text-align:center">
XL1:Request_Path to XL2:Request_Open<o:p></o:p></p>
</td>
<td width="360" valign="top" style="width:269.95pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoListParagraph" align="center" style="margin-left:0in;text-align:center">
XL0: Idle<o:p></o:p></p>
</td>
</tr>
<tr>
<td width="312" valign="top" style="width:233.75pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoListParagraph" align="center" style="margin-left:0in;text-align:center">
XL2:Request_Open to XL3:Open_Confirm_Wait<o:p></o:p></p>
</td>
<td width="360" valign="top" style="width:269.95pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoListParagraph" align="center" style="margin-left:0in;text-align:center">
XL0: Idle -&gt; XL1:Request_Path<o:p></o:p></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class="MsoListParagraph">Our understanding is that if Phy[X] XL state machine is in XL3 and gives Phy Status (Partial Pathway) response to the ECM, the result is &#8220;b) Arbitrating (Wait on Partial)&#8221; confirmation for Phy[Y] XL1 state machine.&nbsp; However per Section
 6.19.4.4<o:p></o:p></p>
<p class="MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><b><i><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%">6.19.4.4 Transition XL1:Request_Path to XL5:Forward_Open<o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="margin-left:1.0in"><i><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%"><o:p>&nbsp;</o:p></span></i></p>
<p class="MsoNormal" style="margin-left:1.0in"><i><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%">This transition shall occur if a Forward Open indication is received and
<u>none of the following confirmations</u> <u>have been received</u>:<o:p></o:p></span></i></p>
<p class="MsoNormal" style="margin-left:1.0in"><b><i><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%">a) Arbitrating (Normal);<o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="margin-left:1.0in"><b><i><u><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%">b) Arbitrating (Waiting On Partial);<o:p></o:p></span></u></i></b></p>
<p class="MsoNormal" style="margin-left:1.0in"><b><i><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%">c) Arbitrating (Blocked On Partial);<o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="margin-left:1.0in"><b><i><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%">d) Arbitrating (Waiting On Connection);<o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="margin-left:1.0in"><i><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%">e) Arb Won;<o:p></o:p></span></i></p>
<p class="MsoNormal" style="margin-left:1.0in"><i><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%">f) Arb Lost;<o:p></o:p></span></i></p>
<p class="MsoNormal" style="margin-left:1.0in"><i><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%">g) Arb Reject (No Destination);<o:p></o:p></span></i></p>
<p class="MsoNormal" style="margin-left:1.0in"><i><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%">h) Arb Reject (Bad Destination);<o:p></o:p></span></i></p>
<p class="MsoNormal" style="margin-left:1.0in"><i><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%">i) Arb Reject (Connection Rate Not Supported);<o:p></o:p></span></i></p>
<p class="MsoNormal" style="margin-left:1.0in"><i><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%">j) Arb Reject (Zone Violation);<o:p></o:p></span></i></p>
<p class="MsoNormal" style="margin-left:1.0in"><i><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%">k) Arb Reject (Pathway Blocked); or<o:p></o:p></span></i></p>
<p class="MsoNormal" style="margin-left:1.0in"><i><span style="color:#2F5597;mso-style-textfill-fill-color:#2F5597;mso-style-textfill-fill-alpha:100.0%">l) Arb Reject (Retry).</span><o:p></o:p></i></p>
<p class="MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class="MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class="MsoListParagraph">then Xl1 to XL5 state transition will never occur.&nbsp; This also means that back-off reverse/retry will not occur (in XL6 state) for higher priority open address frames received from the expander Phy[Y].&nbsp; Is our understanding correct?<o:p></o:p></p>
<p class="MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class="MsoListParagraph">Similarly (referencing Question (1)), if Expander phy[Y] XL state machine does have &nbsp;&#8220;<b><i>a) Arbitrating (Normal)&#8221;
</i></b>confirmation from ECM this would also block XL1 to XL5 state transition of Phy[Y]. Is this a valid interpretation?<o:p></o:p></p>
<p class="MsoListParagraph"><b><i><u><o:p><span style="text-decoration:none">&nbsp;</span></o:p></u></i></b></p>
<p class="MsoListParagraph">Assuming our interpretation is valid, can we suggest the following instead:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.75in">If <b>Request path source address</b> argument and
<b>forward open indication destination sas address</b> argument has same address/argument, then XL1 to XL5 state transition should not have condition a) to d) to check<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">Thank you in advance<o:p></o:p></p>
<p class="MsoNormal">Lana<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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