<html>
<head>
<meta content="text/html; charset=iso-8859-2"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">Zajimave, aspon v simulaci a reportech
to vypada na zpozdeni cca 1-1.5ns ze vstupu na registr, je to
mozne? To by ten LA mohl zvladnout i 600 nebo 800 MHz
vzorkovani...<br>
Ja to teda spis ted delam pro ucel sledovani vnitrnich signalu
FPGA, ze to proste zaintegruju do designu - hlavne mam policeno na
SDRAM a DDR2. Spotrebu logiky odhaduji na 300 LUTs i s UARTem a
pameti dle potreby, zatim 4 bloky (4 kB)<br>
<br>
Dne 6. 3. 2015 v 15:17 Jaroslav Buchta napsal(a):<br>
</div>
<blockquote cite="mid:54F9B6E5.8090202@hascomp.cz" type="cite">
<meta content="text/html; charset=iso-8859-2"
http-equiv="Content-Type">
<div class="moz-cite-prefix">Ja zatim nasel v GUI neco na
nastaveni min/max zpozdeni a vygenerovalo to v .sdc souboru:<br>
<br>
set_max_delay -from [get_ports {ext_reset}] -to [get_registers
{syncreset}] 1.000<br>
set_min_delay -from [get_ports {ext_reset}] -to [get_registers
{syncreset}] 2.000<br>
<br>
Nejak takhle by to melo vypadat - cili nastavit tato omezeni od
vsech vstupu ke vsem vstupnim registrum?<br>
<br>
<br>
Dne 6. 3. 2015 v 14:33 milger napsal(a):<br>
</div>
<blockquote cite="mid:54F9AC99.2060707@pobox.sk" type="cite">
<meta content="text/html; charset=iso-8859-2"
http-equiv="Content-Type">
--Poprosil bych o nasmerovani - dejme tomu, ze mam 8 vstupnich
pinu a zalezi mi na tom, aby na registry prisel signal co nejvic
soucasne - --nevic je kazdy pin pripojen na 4 registry, celkove
by to melo byt co nejmin rozhozene. <br>
<br>
Neviem ci to pomoze, ale napada ma casovy limit pre oneskorenie
skupiny vstupnych signalov. Pozrel som do nejakeho src pre
Xilinx (Webpack) a v subore pre def. pinov *.ucf mam napr.
riadky:<br>
TIMEGRP "TMG_Pads_PCI" = PADS ( "IO_IDSEL" "IO_FRAME" "IO_IRDY"
"IO_CBE*" <br>
TIMEGRP "TMG_FFS_PCI" = FFS ( "U/PCI/*" "TMG_FFS_REGS"
"U/IRQ/*" "TMG_FFS_PCI_F"); <br>
TIMESPEC "TS_P_i02_pci" = FROM "TMG_Pads_PCI" TO
"TMG_FFS_PCI" 11 ns;<br>
t.j. TS_P_i02_pci obecne obmedzenie skupiny vstupnych signalov
na register 11ns.<br>
<br>
Milan<br>
<br>
<b> </b>
<div class="moz-cite-prefix">On 3/6/2015 1:57 PM, Jaroslav
Buchta wrote:<br>
</div>
<blockquote cite="mid:54F9A447.4030706@hascomp.cz" type="cite">Poprosil
bych o nasmerovani - dejme tomu, ze mam 8 vstupnich pinu a
zalezi mi na tom, aby na registry prisel signal co nejvic
soucasne - nevic je kazdy pin pripojen na 4 registry, celkove
by to melo byt co nejmin rozhozene. <br>
Jde/jakym zpusobem toto nastavit jako omezeni pro syntezu? <br>
Nasel jsem spoustu tutorialu ale samy hodinovy signal a je to
hrozne slozite... Jaka klicova slova hledat? <br>
Idea je takova, ze to bude logicky analyzator a vzorkovat se
bude hodinami posunutymi o 90st zatim 100MHz, coz by melo ve
vysledku fungovat jako vzorkovani 400MHz (asi by to slo jeste
i cca 2x zrychlit) <br>
<br>
Jeste druha otazka - mam 4x hodinovy signal 100MHz rozfazovany
po 90st (c0,1,2,3) a signal 60MHz (c4) z tehoz PLL. <br>
Signal reset je synchronizovan nejdrive c4 pro zakladni logiku
a pak c3 pro vzorkovani. Pocitam s tim, ze se to bud stihne
nebo nestihne a signal tedy pro to vzorkovani beru jako
asynchronni. <br>
Je ovsem hlasen warning: Critical Warning (332148): Timing
requirements not met <br>
<br>
V simulaci to funguje dle ocekavani, nenapada me jina moznost
jak synchronizovat signaly mezi obvody s ruznymi hodinami,
vzdycky se tam muze takova situace vyskytnout a ty warningy se
ignoruji nebo nejak osetruji? <br>
Kdyz nastavim 100 a 50 MHz tak je vse OK, hodiny maji stale
stejny vyhovujici odstup. <br>
<br>
<br>
--- <br>
This email has been checked for viruses by Avast antivirus
software. <br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://www.avast.com">http://www.avast.com</a> <br>
<br>
_______________________________________________ <br>
HW-list mailing list - sponsored by <a
moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="http://www.HW.cz">www.HW.cz</a> <br>
<a moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="mailto:Hw-list@list.hw.cz">Hw-list@list.hw.cz</a> <br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://list.hw.cz/mailman/listinfo/hw-list">http://list.hw.cz/mailman/listinfo/hw-list</a>
<br>
</blockquote>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
HW-list mailing list - sponsored by <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="http://www.HW.cz">www.HW.cz</a>
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:Hw-list@list.hw.cz">Hw-list@list.hw.cz</a>
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://list.hw.cz/mailman/listinfo/hw-list">http://list.hw.cz/mailman/listinfo/hw-list</a>
</pre>
</blockquote>
<br>
<br>
<br>
<hr style="border:none; color:#909090; background-color:#B0B0B0;
height: 1px; width: 99%;">
<table style="border-collapse:collapse;border:none;">
<tbody>
<tr>
<td style="border:none;padding:0px 15px 0px 8px"> <a
moz-do-not-send="true" href="http://www.avast.com/"> <img
moz-do-not-send="true"
src="http://static.avast.com/emails/avast-mail-stamp.png"
border="0"> </a> </td>
<td>
<p style="color:#3d4d5a;
font-family:"Calibri","Verdana","Arial","Helvetica";
font-size:12pt;"> This email has been checked for
viruses by Avast antivirus software. <br>
<a moz-do-not-send="true" href="http://www.avast.com/">www.avast.com</a>
</p>
</td>
</tr>
</tbody>
</table>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
HW-list mailing list - sponsored by <a class="moz-txt-link-abbreviated" href="http://www.HW.cz">www.HW.cz</a>
<a class="moz-txt-link-abbreviated" href="mailto:Hw-list@list.hw.cz">Hw-list@list.hw.cz</a>
<a class="moz-txt-link-freetext" href="http://list.hw.cz/mailman/listinfo/hw-list">http://list.hw.cz/mailman/listinfo/hw-list</a>
</pre>
</blockquote>
<br>
<br /><br />
<hr style='border:none; color:#909090; background-color:#B0B0B0; height: 1px; width: 99%;' />
<table style='border-collapse:collapse;border:none;'>
<tr>
<td style='border:none;padding:0px 15px 0px 8px'>
<a href="http://www.avast.com/">
<img border=0 src="http://static.avast.com/emails/avast-mail-stamp.png" />
</a>
</td>
<td>
<p style='color:#3d4d5a; font-family:"Calibri","Verdana","Arial","Helvetica"; font-size:12pt;'>
This email has been checked for viruses by Avast antivirus software.
<br><a href="http://www.avast.com/">www.avast.com</a>
</p>
</td>
</tr>
</table>
<br />
</body>
</html>