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Message
From: Igor Mohor<igor.mohor@g...>
Date: Thu May 10 09:22:01 CEST 2007
Subject: [oc] Question on Ethernet MAC 10/100 Mbps
If you take the wishbone spec (you'll find that somewhere on the Opencores
website), you'll see how the interface is done.
To understand how to operate with Ethernet MAC IP Core, you need to read the
RX and TX Buffer Description in the Ethernet Specification.
The general idea is to have some memory connected to the system (via memory
interface that uses wishbone (this is not part if Eth MAC)). In case that
you want to send the data, you need to store the packet to that memory and
then you tell the Ethernet MAC where the packet is located by setting the
proper BD (buffer descriptor). Once you set the "ready" bit in BD, Ethernet
MAC takes the data from the address where the BD points to and sends it out.
It is similar for reception.
I'm not sure in which state the test bench is at this moment. I'm sure that
most of things are working. I'm using a different test bench, which was
improved a lot. I do that because I also provide the commercial license for
the Ethernet MAC IP Core. It comes with all updates, improvements, higher
throughput, support, etc.
Regards,
Igor
On 5/10/07, attachment.htm
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