07-24-2014 08:37 AM
Looking at document pg072-ten-gig-eth-mac_v13_1 on page 43, Figure 3-9, what is the ordering of the tdata bytes in to the proper bits on the ethernet link?
Specifically, Does 48-bit Destination Address (DA) bits 47:0 go on lines tdata 47:0, or does ethernet link DA[47:40) go on lane tdata 7:0, and so on.
Another way to answer my question: For the Source Address, in Fig 3-9, on the first 64-bit word transfer, on tdata[55:48], is that the most or least significant byte of the Source Address 48-bit address?
Thank you for time
07-25-2014 05:52 AM
The destination address must be supplied with the first byte in lane 0 and the first byte is the lower byte in address.
Followed by the source address following the same address mapping.
07-25-2014 07:02 AM
You can also simulate the example design provided with the core and look into the test bench frames propagation through the core to have more clear understanding.
07-29-2014 07:23 AM
Thanks for the feedback. I'll have to simulate to be sure. The MAC DA and SA and L/T look like they are little endian (so DA byte on tdata(47:40) would be the first byte out on the ethernet wire, with tdata(47) the first bit.
Thanks for your input.