topic If the LCD controller has a lower priority on the EMC bus, refreshes will be stalled. How noticable is this on the screen? in LPC FAQs https://community.nxp.com/t5/LPC-FAQs/If-the-LCD-controller-has-a-lower-priority-on-the-EMC-bus/m-p/463106#M26 <HTML><HEAD></HEAD><BODY><P><SPAN style="color: #646464; font-family: Arial, sans-serif; font-size: 12px;">If it happens, a DMA underflow will occur causing a tear. For the frame being rendered when this happens, the data under the spot of the display where the tear happen will be misaligned. Because the frame is being updated at a high rate (60Hz?), you see a quick flicker on the display. If the tear happens a lot, the flicker can be annoying.</SPAN></P><P><SPAN style="color: #646464; font-family: Arial, sans-serif; font-size: 12px;">It should be noted that the LCD controller will underflow only when it's DMA request is stalled for a considerable amount of time. The LCD controller has it's own buffer memory filled up by DMA and can handle short stalls during it's DMA request.</SPAN></P></BODY></HTML> Thu, 31 Mar 2016 00:57:07 GMT lpcware-support 2016-03-31T00:57:07Z If the LCD controller has a lower priority on the EMC bus, refreshes will be stalled. How noticable is this on the screen? https://community.nxp.com/t5/LPC-FAQs/If-the-LCD-controller-has-a-lower-priority-on-the-EMC-bus/m-p/463106#M26 <HTML><HEAD></HEAD><BODY><P><SPAN style="color: #646464; font-family: Arial, sans-serif; font-size: 12px;">If it happens, a DMA underflow will occur causing a tear. For the frame being rendered when this happens, the data under the spot of the display where the tear happen will be misaligned. Because the frame is being updated at a high rate (60Hz?), you see a quick flicker on the display. If the tear happens a lot, the flicker can be annoying.</SPAN></P><P><SPAN style="color: #646464; font-family: Arial, sans-serif; font-size: 12px;">It should be noted that the LCD controller will underflow only when it's DMA request is stalled for a considerable amount of time. The LCD controller has it's own buffer memory filled up by DMA and can handle short stalls during it's DMA request.</SPAN></P></BODY></HTML> Thu, 31 Mar 2016 00:57:07 GMT https://community.nxp.com/t5/LPC-FAQs/If-the-LCD-controller-has-a-lower-priority-on-the-EMC-bus/m-p/463106#M26 lpcware-support 2016-03-31T00:57:07Z Re: If the LCD controller has a lower priority on the EMC bus, refreshes will be stalled. How noticable is this on the screen? https://community.nxp.com/t5/LPC-FAQs/If-the-LCD-controller-has-a-lower-priority-on-the-EMC-bus/m-p/463107#M27 <HTML><HEAD></HEAD><BODY><P><SPAN class="comment-id">#1</SPAN>Submitted by mahessel on Wed, 2013-08-21 06:00.</P><P></P><P>What is the solution for this issue? How do I increase this priority?</P></BODY></HTML> Tue, 26 Apr 2016 17:27:25 GMT https://community.nxp.com/t5/LPC-FAQs/If-the-LCD-controller-has-a-lower-priority-on-the-EMC-bus/m-p/463107#M27 lpcware-support 2016-04-26T17:27:25Z