* Don't run EMCCLK above 80MHz! * On the datasheet for the LPC178x/7x, page 84 and 85 shows that Tcy has a minimum of 12.5ns, which translates to a maximum EMC Clock of 80MHz. We found out the hard way that it may work on most LPC1788s, but not on some! Not recommended to run it above spec. Our product using LPC1788 has LCD at max refresh rate, AND running the program itself out of DRAM, and no trouble with Ethernet. Not sure where to look for issues... make sure everything is using 32 bit transfers and DRAM is configured as a 32 bit interface...
________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Lehel Benedek Sent: Sunday, January 05, 2014 7:45 PM To: [email protected] Subject: Re: [lwip-users] missing TX packets I managed to fix the problem by increasing the EMC clock rate from 60Mhz to 104Mhz and lowering the refresh rate of the LCD. The LCD controller was eating up all my bandwith to the external memory. Now both the webserver and the LCD are working nicely. Thanks for your help.
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