mac/core: Allow using core_dw smaller than phy_dw #177
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Especially for XGMII PHYs with 64 bit width, a 32 bit datapath uses much less resources
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Especially for the XGMII PHY with 64 bit width, a 32 bit datapath uses much less resources and only needs to run at 312.5 MHz, very doable on many FPGAs