maximum ethernet speed

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originally posted by revolt@Oct 1 2005, 07:09 AM

i took a look at a 1000 mbit mac ip from morethanip. they use a 4 bit mii interface @ 25 mhz to transfer the data to the phy. so the interface has a limit from 12.5 mbyte/s. i think gigabit ethernet is not fast enough.

kind regards

revolt

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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

by the way, when you want to reach 600 mbit (or even 400) then the receiving end station will be a problem, since 600 mbit is 75 mb/s, there are very few non server system that can sustain this kind of speed, so even if you could get this with a nios or orther FPGA system, the receiving end will have one hell of a time taking the data in (most normal HDD&#39;s cant do sustained writes over 60 mb/s)

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?