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hi,
When I tested the Ethernet Interface of WARP in polling method, I found out when the host PC sent out a packet which length was less than 60bytes the PowerPC would receive a packet which length was equal to 64bytes. I do not know why does this happen?I also fould out when the host PC sent out a packet which length was more than or equal to 60bytes, the PowerPC would receive a packet which length was 4bytes more than the transmitted one. I do not know what does the additional 4 bytes mean?
Thanks
Last edited by jlliu (2007-Mar-15 17:58:44)
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I think you're seeing the normal behavior of standard Ethernet devices. First, every packet has a 4-byte check sum appended to the end of the user payload. Second, the minimum Ethernet frame size is 64 bytes, including this checksum. A quick Google search turns up pages like this and this, which explain the Ethernet frame format in more detail.
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