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that would cap the datarate at 100 mbit exactly, so there wouldnt be a point in using a Gbit lan mac[/b]
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I searched a litte more and found a PHY IC from National (DP83865) that have a 8 bit wide interface (GMII) @25MHz. Then you have 200Mbit.
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by the way, revolt, you said you did the checksum in HW, i asume this is a function normally done by the lwip? like CRC?[/b]
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The checksum calculation for the UDP packets is done by HW. Normally it is calculated by the lwip stack.