lpcware

LPC43xx SDRAM working at high frequencies

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by michele_sponchiado_windows on Tue Jun 30 05:59:20 MST 2015
Hi,
I am using the LPC43xx and I've evaluated some boards (WaveShare 4357, EA4357).
In none of these I was able to achieve a SDRAM working frequency bigger than 150MHz.
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.

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.

Has anyone every succeded running a SDRAM to frequencies higher than 150MHz?
Thanks

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