topic Re: LPC43xx SDRAM working at high frequencies in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-SDRAM-working-at-high-frequencies/m-p/553150#M14523 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by mc on Tue Jun 30 07:11:51 MST 2015</STRONG><BR /><SPAN>Hi,</SPAN><BR /><SPAN>150MHz SDRAM frequency is out of specification.The maximum speed is 120MHz. In this case your Core clock should also run at 120MHz.</SPAN></BODY></HTML> Wed, 15 Jun 2016 18:37:32 GMT lpcware 2016-06-15T18:37:32Z LPC43xx SDRAM working at high frequencies https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-SDRAM-working-at-high-frequencies/m-p/553149#M14522 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by michele_sponchiado_windows on Tue Jun 30 05:59:20 MST 2015</STRONG><BR /><SPAN>Hi,</SPAN><BR /><SPAN>I am using the LPC43xx and I've evaluated some boards (WaveShare 4357, EA4357).</SPAN><BR /><SPAN>In none of these I was able to achieve a SDRAM working frequency bigger than 150MHz.</SPAN><BR /><SPAN>If I increase the frequency to the next PLL step, I never found a setup where the system works fine, because typically HardFault arise when e.g. using the external memory as a memory pool, or as a heap etc.</SPAN><BR /><BR /><SPAN>I tried changing sfsclk settings as set in AN11508, changing the emc delay clock, using only the CLK1 signal to interface the SDRAM, but without success.</SPAN><BR /><BR /><SPAN>Has anyone every succeded running a SDRAM to frequencies higher than 150MHz?</SPAN><BR /><SPAN>Thanks</SPAN></BODY></HTML> Wed, 15 Jun 2016 18:37:31 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-SDRAM-working-at-high-frequencies/m-p/553149#M14522 lpcware 2016-06-15T18:37:31Z Re: LPC43xx SDRAM working at high frequencies https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-SDRAM-working-at-high-frequencies/m-p/553150#M14523 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by mc on Tue Jun 30 07:11:51 MST 2015</STRONG><BR /><SPAN>Hi,</SPAN><BR /><SPAN>150MHz SDRAM frequency is out of specification.The maximum speed is 120MHz. In this case your Core clock should also run at 120MHz.</SPAN></BODY></HTML> Wed, 15 Jun 2016 18:37:32 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC43xx-SDRAM-working-at-high-frequencies/m-p/553150#M14523 lpcware 2016-06-15T18:37:32Z