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[ethmac] Frame transmission and external memory

Hi all,

At the Ethernet specification document, page 28, it says that a RISC 
should store the frame to be transmitted first in the memory and then 
set a pointer to it at the buffer descriptor in the ethernet core internal 
memory. Can this memory be a an external memory, for example, a 
SRAM bank at a XSV board? The Ethernet core can access this external 
memory chip directly through its wishbone master interface?


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