LPC MicrocontrollersのトピックRe: LPC1778 enthernet paket lost

LPC1778 enthernet paket lost

lpcware — Wed, 15 Jun 2016 17:40:42 GMT

Content originally posted in LPCWare by gjzxwht on Sat May 17 05:15:59 MST 2014
LPC1788 +sdram(8M)+LAN8710,lwip,ucosiii
cpuclk:100M;emclk:50M
100M-T,packet loss seriously,20%;10M-T,packet loss seriously,10%;
then,emclk update to 100MHz,packet loss very low,but sdram not stable,will die when high temperature,about 50C.
DMA speed?EMC bandwidth?
thank you!

Re: LPC1778 enthernet paket lost

lpcware — Wed, 15 Jun 2016 17:40:43 GMT

Content originally posted in LPCWare by mc on Sat May 17 21:28:00 MST 2014
Hi gjzzwht,
Could you please try Core clock of 80MHz and EMC clock of 80MHz? In this case EMC will support higher bandwidth and it is with in specification. 100MHz EMC clock is out of spec for this chip.

What other peripherals are used?

Re: LPC1778 enthernet paket lost

lpcware — Wed, 15 Jun 2016 17:40:43 GMT

Content originally posted in LPCWare by gjzxwht on Sun May 18 20:43:12 MST 2014
i think the problem the buf releated mac is not fast enough,for example dma, so 10M-T is better than 100M-T.
I want put the buf into inner sram,but i don't how to do.
now i try cpuclk 75MHz and emcclk 75MHz。

Re: LPC1778 enthernet paket lost

lpcware — Wed, 15 Jun 2016 17:40:44 GMT

Content originally posted in LPCWare by gjzxwht on Mon May 19 21:23:08 MST 2014
who can tell me how to use "LPC_TX_PBUF_BOUNCE_EN"?
and how to set zero-copy mode and non zero-copy mode?