DDR ram issue using MCF54450 @240Mhz
Granville Gregg <[email protected]> Wed, 17 Dec 2008 06:59:50 -0600
| Newsgroups | gmane.comp.hardware.motorola.microcontrollers.coldfire |
|---|---|
| Message-ID | <FF1386EFB790944DAC83D2BDF0AE7235037801D729@us01ex03.GLOBAL.JHCN.NET> |
--_000_FF1386EFB790944DAC83D2BDF0AE7235037801D729us01ex03GLOBA_
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
We have a MCF54450 running at a CPU CLK of 240Mhz. we are using U-Boot 1.2=
.0 our design is using 1 16 bit Flash a PC28F256P33B85 BGA64. We are execut=
ing code in Flash and have written a DDR-ram test walking ones and walking =
zeros and address and address this will run for days at a time billions and=
billions of writes and reads.
When we move this to DDR-ram which is a MICRON MT47H64M8CF-3:F which we use=
two of on SD-16 through SD-31with SD_A0-SD_A13 and
SD_CS
SD_DM2
SD_DQS2
SD_DM3
SD_DMQS3
We cannot run code we are using the same settings as the Reference design t=
he same chips. I have layed out the board with mentor and have put restrain=
ts in all of the lines to keep them within .4 inches in length.
The symptoms are it either gets an exception out in space or locks up befor=
e it gets to NET: functions
Anyone have any thoughts about the issue.
Gregg
--_000_FF1386EFB790944DAC83D2BDF0AE7235037801D729us01ex03GLOBA_
Content-Type: text/html; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
<html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr=
osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D"http:=
//www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=3DContent-Type content=3D"text/html; charset=3Dus-ascii">
<meta name=3DGenerator content=3D"Microsoft Word 12 (filtered medium)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoNoSpacing, li.MsoNoSpacing, div.MsoNoSpacing
{mso-style-priority:1;
margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
span.EmailStyle17
{mso-style-type:personal;
font-family:"Arial","sans-serif";
color:windowtext;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;}
div.Section1
{page:Section1;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=3DEN-US link=3Dblue vlink=3Dpurple>
<div class=3DSection1>
<p class=3DMsoNormal>We have a MCF54450 running at a CPU CLK of 240Mhz. we =
are
using U-Boot 1.2.0 our design is using 1 16 bit Flash a PC28F256P33B8=
5
BGA64. We are executing code in Flash and have written a DDR-ram test walki=
ng
ones and walking zeros and address and address this will run for days at a =
time
billions and billions of writes and reads.<o:p></o:p></p>
<p class=3DMsoNoSpacing>When we move this to DDR-ram which is a MICRON
MT47H64M8CF-3:F which we use two of on SD-16 through SD-31with SD_A0-SD_A13=
and<o:p></o:p></p>
<p class=3DMsoNoSpacing>SD_CS<o:p></o:p></p>
<p class=3DMsoNoSpacing>SD_DM2<o:p></o:p></p>
<p class=3DMsoNoSpacing>SD_DQS2<o:p></o:p></p>
<p class=3DMsoNoSpacing>SD_DM3<o:p></o:p></p>
<p class=3DMsoNoSpacing>SD_DMQS3<o:p></o:p></p>
<p class=3DMsoNoSpacing><o:p> </o:p></p>
<p class=3DMsoNoSpacing>We cannot run code we are using the same settings a=
s the
Reference design the same chips. I have layed out the board with mentor and
have put restraints in all of the lines to keep them within .4 inches in
length. <o:p></o:p></p>
<p class=3DMsoNoSpacing><o:p> </o:p></p>
<p class=3DMsoNoSpacing>The symptoms are it either gets an exception out in=
space
or locks up before it gets to NET: functions<o:p></o:p></p>
<p class=3DMsoNormal><o:p> </o:p></p>
<p class=3DMsoNormal>Anyone have any thoughts about the issue.<o:p></o:p></=
p>
<p class=3DMsoNormal><o:p> </o:p></p>
<p class=3DMsoNormal>Gregg <o:p></o:p></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
</div>
</body>
</html>
[email protected]=09Send a post to the list.
[email protected]=09Join the list.
[email protected]=09Join the list in digest mode.
[email protected]=09Leave the list.
--_000_FF1386EFB790944DAC83D2BDF0AE7235037801D729us01ex03GLOBA_--