topic Re: Interesting behavior on LPC4088 Quickstart board + Experiment Base Board (Network related) in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/Interesting-behavior-on-LPC4088-Quickstart-board-Experiment-Base/m-p/548304#M13620 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by xianghuiwang on Fri Apr 24 10:38:22 MST 2015</STRONG><BR /><SPAN>hi, </SPAN><BR /><SPAN>your observation makes a lot sense. Thanks for letting us know.</SPAN><BR /><SPAN>Please keep us posted with your findings.</SPAN><BR /><SPAN>regards,</SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 18:30:31 GMT lpcware 2016-06-15T18:30:31Z Interesting behavior on LPC4088 Quickstart board + Experiment Base Board (Network related) https://community.nxp.com/t5/LPC-Microcontrollers/Interesting-behavior-on-LPC4088-Quickstart-board-Experiment-Base/m-p/548303#M13619 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by profanum429 on Fri Apr 03 18:34:27 MST 2015</STRONG><BR /><SPAN>We have a LPC4088 QSB + associated Experiment Base Board. We've been running a LPCOpen based network application on one of them for the past 2 months without issue and ordered three more QSBs + base boards. These three arrived and all exhibit the same issue; when we do a cold start we'll see the PHY immediately think it has a connection (polling the PHY status initially returns 0x02 then constantly 0x3C immediately after). This behavior happens wether a cable is plugged in or not. Pressing the reset button results in normal expected behavior that our original setup produces.</SPAN><BR /><BR /><SPAN>Removing power completely and doing another cold start brings back the original problem which can be solved by the user doing a reset. Doing a NVIC_SystemReset does not fix the issue nor does connecting a GPIO to the reset line and pulling it high in software. I'm assuming this is an issue with the LAN8720 needing to have a 100 uSec reset time and my software reset strategies don't produce nearly that amount of time.</SPAN><BR /><BR /><SPAN>I also see this same issue using the tcpecho_sa sample project from the 2.10 version of LPCOpen for the LPC4088. I'm wondering if anyone else has seen this issue? I'm thinking we might of gotten a set of QSBs (the ones with the problem all have the same lot and date code, different from the working one) that might have a defective component? Next step will probably be monitoring the power signal going to the LAN8720 on startup on a bad board and a good board but that will have to wait until Monday.</SPAN></BODY></HTML> Wed, 15 Jun 2016 18:30:29 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Interesting-behavior-on-LPC4088-Quickstart-board-Experiment-Base/m-p/548303#M13619 lpcware 2016-06-15T18:30:29Z Re: Interesting behavior on LPC4088 Quickstart board + Experiment Base Board (Network related) https://community.nxp.com/t5/LPC-Microcontrollers/Interesting-behavior-on-LPC4088-Quickstart-board-Experiment-Base/m-p/548304#M13620 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by xianghuiwang on Fri Apr 24 10:38:22 MST 2015</STRONG><BR /><SPAN>hi, </SPAN><BR /><SPAN>your observation makes a lot sense. Thanks for letting us know.</SPAN><BR /><SPAN>Please keep us posted with your findings.</SPAN><BR /><SPAN>regards,</SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 18:30:31 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Interesting-behavior-on-LPC4088-Quickstart-board-Experiment-Base/m-p/548304#M13620 lpcware 2016-06-15T18:30:31Z