RE: Re: Sourcing Older MPC555 CPUs
"Dees Randy-RSAF30" <[email protected]> Sun, 14 Jun 2009 19:30:24 -0700
| Newsgroups | gmane.comp.hardware.motorola.microcontrollers |
|---|---|
| Message-ID | <3CCF040BDA7E0A46B3DF0F6B4741630A03A82A0E@az33exm23.fsl.freescale.net> |
--yMRTY3FHinOt6HWWXEzoG3RIDIH9oyuSfJswxCd Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit A properly designed system can use either the K3 or the M revisions of the MPC555 without any issues. however, there are errata fixes between the two mask sets that must be accounted for in system designs. of particular note: On the K3 mask set there were internal pull up devices on some pins that could never be disabled. When software wrote to the SPRDS bit in the PDMCR to disable these pull ups, they would not be disabled. In revision M, they will be disabled. This affects the following pins: BI/STS, BURST, BDIP, TA, TS, TSIZ1, TSIZ0, TEA, RD/WR,BR/VF1/IWP2, BG/VF0/IWP0, BB/VF2/IWP3. Depending on the functionality enabled on the pin, this may or may not cause issues if there is no external pull up. If the bus control pins (BB, BG, BR) functions are enabled without pull ups, the bus will hang. for other pins there are other conditions that could cause system failures. TEA always requires an external resistor. It should be noted that the internal weak devices are not specified to guarantee correct operation if the external resistors are not designed into the system. These external resistors are required per the MPC555 Reference Manual). K3 devices without these external resistors will work properly in most cases, but will not be robust and could fail under some conditions - like temperature or voltage extremes (within the normal operating specifications of the device). randy ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of murphynetuk Sent: Sunday, June 14, 2009 4:02 AM To: [email protected] Subject: [MPC500] Re: Sourcing Older MPC555 CPUs Hi, I'm afraid I can't help you with sourcing K3 chips, but I'm curious as to the board layout differences required for the M mask chips? I did a board design a few years ago which used the K3 chip, and if I need to change it I'd like to understand why... [Non-text portions of this message have been removed] --yMRTY3FHinOt6HWWXEzoG3RIDIH9oyuSfJswxCd Content-Type: text/html; charset=US-ASCII Content-Transfer-Encoding: 7bit <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> </head> <body style="background-color: #ffffff;"> <!--~-|**|PrettyHtmlStartT|**|-~--> <div id="ygrp-mlmsg" style="width:655px; position:relative;"> <div id="ygrp-msg" style="width: 470px; margin:0; padding:0 25px 0 0; float:left; z-index:1;"> <!--~-|**|PrettyHtmlEndT|**|-~--> <div id="ygrp-text" > <!--~-|**|PrettyHtmlStart|**|-~--> <br><br> <!--~-|**|PrettyHtmlEnd|**|-~--> <p>A properly designed system can use either the K3 or the M revisions of<br> the MPC555 without any issues.<br> <br> however, there are errata fixes between the two mask sets that must be<br> accounted for in system designs. <br> <br> of particular note: On the K3 mask set there were internal pull up<br> devices on some pins that could never be disabled. When software wrote<br> to the SPRDS bit in the PDMCR to disable these pull ups, they would not<br> be disabled. In revision M, they will be disabled. This affects the<br> following pins: BI/STS, BURST, BDIP, TA, TS, TSIZ1, TSIZ0, TEA,<br> RD/WR,BR/VF1/<wbr>IWP2, BG/VF0/IWP0, BB/VF2/IWP3. Depending on the<br> functionality enabled on the pin, this may or may not cause issues if<br> there is no external pull up. If the bus control pins (BB, BG, BR)<br> functions are enabled without pull ups, the bus will hang. for other<br> pins there are other conditions that could cause system failures. TEA<br> always requires an external resistor.<br> <br> It should be noted that the internal weak devices are not specified to<br> guarantee correct operation if the external resistors are not designed<br> into the system. These external resistors are required per the MPC555<br> Reference Manual). K3 devices without these external resistors will work<br> properly in most cases, but will not be robust and could fail under some<br> conditions - like temperature or voltage extremes (within the normal<br> operating specifications of the device).<br> <br> randy<br> <br> ____________<wbr>_________<wbr>_________<wbr>__<br> <br> From: <a href="mailto:MPC500%40yahoogroups.com">MPC500@yahoogroups.<wbr>com</a> [mailto:<a href="mailto:MPC500%40yahoogroups.com">MPC500@yahoogroups.<wbr>com</a>] On Behalf<br> Of murphynetuk<br> Sent: Sunday, June 14, 2009 4:02 AM<br> To: <a href="mailto:MPC500%40yahoogroups.com">MPC500@yahoogroups.<wbr>com</a><br> Subject: [MPC500] Re: Sourcing Older MPC555 CPUs <br> <br> Hi,<br> <br> I'm afraid I can't help you with sourcing K3 chips, but I'm curious as<br> to the board layout differences required for the M mask chips? <br> <br> I did a board design a few years ago which used the K3 chip, and if I<br> need to change it I'd like to understand why...<br> <br> <br> [Non-text portions of this message have been removed]<br> <br> </p> </div> <!--~-|**|PrettyHtmlStart|**|-~--> <div width="1" style="color: white; clear: both;">__._,_.___</div> <!-- Start the section with Message In topic --> <div id="ygrp-actbar" style="clear: both; margini-bottom: 25px; white-space:nowrap; color: #666; text-align: right;"> <span class="left" style="float: left; white-space:nowrap;"> <a href="http://groups.yahoo.com/group/MPC500/message/3999;_ylc=X3oDMTM0ZDJkbmI4BF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BG1zZ0lkAzQwMDQEc2VjA2Z0cgRzbGsDdnRwYwRzdGltZQMxMjQ1MDMzMjk0BHRwY0lkAzM5OTk-"> Messages in this topic </a> (<span class="bld" style="font-weight:bold;">3</span>) </span> <a href="http://groups.yahoo.com/group/MPC500/post;_ylc=X3oDMTJwaDk4bmZqBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BG1zZ0lkAzQwMDQEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxMjQ1MDMzMjk0?act=reply&messageNum=4004"> <span class="bld" style="font-weight:bold;"> Reply </span> (via web post) </a> | <a href="http://groups.yahoo.com/group/MPC500/post;_ylc=X3oDMTJlY2g2czlkBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BHNlYwNmdHIEc2xrA250cGMEc3RpbWUDMTI0NTAzMzI5NA--" class="bld" style="font-weight:bold;"> Start a new topic </a> </div> <!------- Start Nav Bar ------> <!-- |**|begin egp html banner|**| --> <div id="ygrp-vitnav" style="padding-top: 10px; font-family: Verdana; font-size: 77%; margin: 0;"> <a href="http://groups.yahoo.com/group/MPC500/messages;_ylc=X3oDMTJlb2dyNmozBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BHNlYwNmdHIEc2xrA21zZ3MEc3RpbWUDMTI0NTAzMzI5NA--">Messages</a> | <a href="http://groups.yahoo.com/group/MPC500/links;_ylc=X3oDMTJmaW82OGQxBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BHNlYwNmdHIEc2xrA2xpbmtzBHN0aW1lAzEyNDUwMzMyOTQ-">Links</a> </div> <!-- |**|end egp html banner|**| --> <div id="ygrp-grft" style="font-family: Verdana; font-size: 77%; padding: 15px 0;"> </div> <div id="ygrp-mkp"> <div id="hd">MARKETPLACE</div> <div id="ads"> <div class="ad" style="color:#628C2A; font-family:Arial; font-weight:bold;"> <a href="http://us.ard.yahoo.com/SIG=14kqjp3i6/M=733250.13450162.13535738.10835568/D=groups/S=1706554205:MKP1/Y=YAHOO/EXP=1245040495/L=/B=fAijCEPDhEw-/J=1245033295000625/K=l6kxhIloJIyRERIMItyuXA/A=5754786/R=0/SIG=12eblfli8/*http://www.socialtrack.net/redir.aspx?CID=18601&AFID=43106&DID=81069&SID=350">I Make $350 per Day. 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