topic WORKING: LPC43xx running at 204MHz with SDRAM in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/WORKING-LPC43xx-running-at-204MHz-with-SDRAM/m-p/558100#M15546 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by rgledhill on Tue Jun 18 00:32:31 MST 2013</STRONG><BR /><P>Hi everyone,</P><BR /><P>There are many posts on here about the problems getting an external SDRAM working properly when the processor is running at 204MHz.&nbsp; Well, we have found a configuration that works!</P><BR /><P>I've attached it here for people to try; let me know how you get on.</P><BR /><P>By the way if you use the NXP driver for the RTC, you will find that RTC_Init() very helpfull reconfigures one of the SDRAM lines to be a 32.768kHz CLKOUT, which obviously stops the SDRAM working.&nbsp; I've attached a corrected version.&nbsp; Note this is based on the CMSIS driver pack from the repository - it might already be fixed in the LPCOpen distribution, I haven't looked.</P><BR /><P>Enjoy!</P><BR /><P>Richard</P><BR /><P>Hitex (UK) Ltd</P><P><STRONG>Original Attachment has been moved to: <A _jive_internal="true" href="https://community.nxp.com/docs/DOC-337994">lpc43xx_rtc.c.zip</A></STRONG></P><P><STRONG>Original Attachment has been moved to: <A _jive_internal="true" href="https://community.nxp.com/docs/DOC-337994">system_LPC43xx_0.c.zip</A></STRONG></P></BODY></HTML> Wed, 15 Jun 2016 18:41:21 GMT lpcware 2016-06-15T18:41:21Z WORKING: LPC43xx running at 204MHz with SDRAM https://community.nxp.com/t5/LPC-Microcontrollers/WORKING-LPC43xx-running-at-204MHz-with-SDRAM/m-p/558100#M15546 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by rgledhill on Tue Jun 18 00:32:31 MST 2013</STRONG><BR /><P>Hi everyone,</P><BR /><P>There are many posts on here about the problems getting an external SDRAM working properly when the processor is running at 204MHz.&nbsp; Well, we have found a configuration that works!</P><BR /><P>I've attached it here for people to try; let me know how you get on.</P><BR /><P>By the way if you use the NXP driver for the RTC, you will find that RTC_Init() very helpfull reconfigures one of the SDRAM lines to be a 32.768kHz CLKOUT, which obviously stops the SDRAM working.&nbsp; I've attached a corrected version.&nbsp; Note this is based on the CMSIS driver pack from the repository - it might already be fixed in the LPCOpen distribution, I haven't looked.</P><BR /><P>Enjoy!</P><BR /><P>Richard</P><BR /><P>Hitex (UK) Ltd</P><P><STRONG>Original Attachment has been moved to: <A _jive_internal="true" href="https://community.nxp.com/docs/DOC-337994">lpc43xx_rtc.c.zip</A></STRONG></P><P><STRONG>Original Attachment has been moved to: <A _jive_internal="true" href="https://community.nxp.com/docs/DOC-337994">system_LPC43xx_0.c.zip</A></STRONG></P></BODY></HTML> Wed, 15 Jun 2016 18:41:21 GMT https://community.nxp.com/t5/LPC-Microcontrollers/WORKING-LPC43xx-running-at-204MHz-with-SDRAM/m-p/558100#M15546 lpcware 2016-06-15T18:41:21Z