<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="IncrediMail 1.0" name=GENERATOR></HEAD>
<BODY style="BACKGROUND-POSITION: 0px 0px; FONT-SIZE: 12pt; MARGIN: 5px 10px 10px; FONT-FAMILY: Arial" bgColor=#ffffff background="" scroll=yes ORGYPOS="0">
<TABLE id=INCREDIMAINTABLE cellSpacing=0 cellPadding=2 width="100%" border=0>
<TBODY>
<TR>
<TD id=INCREDITEXTREGION style="FONT-SIZE: 12pt; CURSOR: auto; FONT-FAMILY: Arial" width="100%">
<DIV>Ah, all is clear now, apologies for the dumb query! Thanks Phil for a great design.</DIV>
<DIV> </DIV>
<DIV>Kevin</DIV>
<DIV>M0KHZ</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV id=IncrediOriginalMessage><I>-------Original Message-------</I></DIV>
<DIV> </DIV>
<DIV id=receivestrings>
<DIV dir=ltr style="FONT-SIZE: 11pt"><I><B>From:</B></I> <A href="mailto:p.covington@gmail.com">Philip Covington</A></DIV>
<DIV dir=ltr style="FONT-SIZE: 11pt"><I><B>Date:</B></I> 05/18/06 20:39:29</DIV>
<DIV dir=ltr style="FONT-SIZE: 11pt"><I><B>To:</B></I> <A href="mailto:g5rda@tiscali.co.uk">Gerda & Kevin</A></DIV>
<DIV dir=ltr style="FONT-SIZE: 11pt"><I><B>Cc:</B></I> <A href="mailto:hpsdr@hpsdr.org">hpsdr@hpsdr.org</A></DIV>
<DIV dir=ltr style="FONT-SIZE: 11pt"><I><B>Subject:</B></I> Re: [hpsdr] Ozy – Schematic OZY_REVXA4.sch (comments)</DIV></DIV>
<DIV> </DIV>
<DIV>On 5/18/06, Gerda & Kevin <<A href="mailto:g5rda@tiscali.co.uk">g5rda@tiscali.co.uk</A>> wrote:</DIV>
<DIV> </DIV>
<DIV>> Phil, big update, great work, although I still don't understand the ATLAS_NRESET / ATLAS_X17C1 nets.</DIV>
<DIV>></DIV>
<DIV>> I would have expected the reset to come from the FPGA, unless jumper 14 was installed enabling the reset to come from the Atlas bus. If this is the case the ATLAS_NRESET net should be connected to the fpga, pin 118 perhaps? Or is my logic fundamentally flawed??</DIV>
<DIV>></DIV>
<DIV>> Kevin</DIV>
<DIV>> M0KHZ</DIV>
<DIV> </DIV>
<DIV>Hi Kevin</DIV>
<DIV> </DIV>
<DIV>The way it is connected now allows either the MCP130 to pull the</DIV>
<DIV>nReset line on the bus low or the FPGA pin connected to X17C1 to pull</DIV>
<DIV>nRESET low on the bus. If the jumper is made then if the FPGA pulls</DIV>
<DIV>nRESET low (or something else on the bus) then FX2 will also be reset.</DIV>
<DIV> If the jumper is not made the FPGA can reset whatever is on the bus</DIV>
<DIV>(or allow something on the bus to cause a nRESET) without causing the</DIV>
<DIV>FX2 to be reset also.</DIV>
<DIV> </DIV>
<DIV>73 de Phil N8VB</DIV></TD></TR>
<TR>
<TD id=INCREDIFOOTER width="100%">
<TABLE cellSpacing=0 cellPadding=0 width="100%">
<TBODY>
<TR>
<TD width="100%"></TD>
<TD id=INCREDISOUND vAlign=bottom align=middle></TD>
<TD id=INCREDIANIM vAlign=bottom align=middle></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE><SPAN id=IncrediStamp><SPAN dir=ltr><A href="http://www.incredimail.com/index.asp?id=54475"><IMG alt="Add FUN to your email - CLICK HERE!" hspace=0 src="http://www2.incredimail.com/contents/stamps/imstp_emo_en.gif" align=baseline border=0></A></SPAN></SPAN></BODY></HTML>