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How to increase number of endpoints

Hi,

I am stuck at the point where the endpoints at my disposal are not enough to fulfill the functional requirements. I am using lpc3131 from NXP and it provides 3 endpoints ( excluding 1 control EP). But my device communicates at 4 endpoint addresses. So, is there a way that i can share a physical endpoint with two logical pipes so that when host requests data from device's two endpoints say 81 and 85 , but only available being 81 , request at 85 is also serviced by the 81 or 82 or 83( as only 3 are available)?

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