topic Re: Compact Flash (ATA) Hot Swap on MCF5445x - CPU freeze in ColdFire/68K Microcontrollers and Processors https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Compact-Flash-ATA-Hot-Swap-on-MCF5445x-CPU-freeze/m-p/184578#M7675 <HTML><HEAD></HEAD><BODY><P>This is probably power system issue. On this page is same notes about hot swap of MMC/SC cards and apropriate power lines decupling. <A href="http://elm-chan.org/docs/mmc/mmc_e.html" rel="nofollow" target="_blank">http://elm-chan.org/docs/mmc/mmc_e.html</A></P><P>&nbsp;</P><P>Best regards</P><P>&nbsp;</P><P>Andrija</P></BODY></HTML> Mon, 22 Mar 2010 18:04:09 GMT aersek 2010-03-22T18:04:09Z Compact Flash (ATA) Hot Swap on MCF5445x - CPU freeze https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Compact-Flash-ATA-Hot-Swap-on-MCF5445x-CPU-freeze/m-p/184577#M7674 <HTML><HEAD></HEAD><BODY><P>I have a 54454 design using a Compact Flash card attached directly to the ATA lines. When the CF card is inserted when the board is powered up (i.e. hot swapped), approximately 1/3 of the time the CPU will freeze (and eventually resets due to the watchdog). If the board is reset&nbsp;with the card in place, the CF card works perfectly. Has anyone else seen any issues with this?</P><P>&nbsp;</P><UL><LI>The wiring is fairly straight forward and follows the various appnotes I've found on the subject. Basically a direct connection from the CF card holder, to the corresponding pin on the 54454 ATA bus, with pullups/downs where appropriate.</LI><LI>I&nbsp;have eliminated software being the issue. I can completely reduce the code running on the CPU to almost nothing (including no&nbsp;ATA interaction of any kind) and the probloem still occurs.</LI><LI>The only thing that seems to do the trick is killing power to the CF card, which obviously isn't terribly useful.</LI><LI>If the watchdog is disabled, the CPU becomes completely frozen. There are no exceptions, no bus faults, nothing at all.</LI></UL><P>Any ideas? Has anyone else successfully designed a CF interface on the 54454? If so, can you hot wap the card? Anyone perhaps have similar experiences with normal ATA devices (i.e. hot swapable HDs)?</P><P>&nbsp;</P><P>Thanks,</P><P>&nbsp;</P><P>Chris</P><P>&nbsp;</P><P>Keywords: MCF54454, MCF54455,&nbsp;MCF5445x, 54454, 54455, 5445x, ATA, Compact Flash, CF, hot swap</P></BODY></HTML> Sat, 20 Mar 2010 02:44:34 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Compact-Flash-ATA-Hot-Swap-on-MCF5445x-CPU-freeze/m-p/184577#M7674 cmaryan 2010-03-20T02:44:34Z Re: Compact Flash (ATA) Hot Swap on MCF5445x - CPU freeze https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Compact-Flash-ATA-Hot-Swap-on-MCF5445x-CPU-freeze/m-p/184578#M7675 <HTML><HEAD></HEAD><BODY><P>This is probably power system issue. On this page is same notes about hot swap of MMC/SC cards and apropriate power lines decupling. <A href="http://elm-chan.org/docs/mmc/mmc_e.html" rel="nofollow" target="_blank">http://elm-chan.org/docs/mmc/mmc_e.html</A></P><P>&nbsp;</P><P>Best regards</P><P>&nbsp;</P><P>Andrija</P></BODY></HTML> Mon, 22 Mar 2010 18:04:09 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Compact-Flash-ATA-Hot-Swap-on-MCF5445x-CPU-freeze/m-p/184578#M7675 aersek 2010-03-22T18:04:09Z Re: Compact Flash (ATA) Hot Swap on MCF5445x - CPU freeze https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Compact-Flash-ATA-Hot-Swap-on-MCF5445x-CPU-freeze/m-p/184579#M7676 <HTML><HEAD></HEAD><BODY><P>Please provide me the schematic of CF to ATA converter if you have sucessfully sorted out the problem. I require this for my design.</P><P>&nbsp;</P><P>regards</P><P>Ammar</P></BODY></HTML> Sun, 19 Jun 2011 02:24:15 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/Compact-Flash-ATA-Hot-Swap-on-MCF5445x-CPU-freeze/m-p/184579#M7676 AmmarAhmedSiddi 2011-06-19T02:24:15Z