New Contributor
Regular ContributorHi Konrad,
You are right. Looks like TSE small MAC doesn't support 8 bits option.
The recommended and right way is to use the the mask bit signal "ff_tx_mod[1:0]" for 32 bits transfer as I explained in my first reply. You will need to modify your Tx source user logic design accordingly to use mask bit signal.
Thanks.
Regards,
dlim
New ContributorI have found the problem I had. I had connected 125MHz from the PLL instead of 25MHz from the PHY. A stupid oversight I had meant to correct.
For other users with problems, the avalon-st as in the trace I have posted seems to be correct.
I have another problem now. I lose the first 2 bytes that I send, i.e. the upper MSB bytes of the first 32-bit word clocked into the TSE. I can send multiple 32-bit words consistently without error, but the first two bytes are never sent. It is as if the TSE is dropping these bytes, as the other half of the 32-bit word is OK.
e.g. I send 0x11223344 0x55667788 0x99AABBCC etc, and I receive 0x33445566 0x778899AA 0xBBCCDDEE
I am sending the data directly into a piece of test equipment that guarantees that the pre-amble is OK.
Even more confusing is that if I set the TSE to fill in the MAC address, the received MAC is in the correct place, i.e. 0x33445566 0x7788mmmm 0xmmmmmmmm
The SignalTap shows that the 32-bit words on the avalon-st are OK and not corrupted,
If anyone has any ideas as to what I am doing wrong I would love some feedback,
Konrad
New Contributorfound it, ...if you tick the Megafunction "Align to 32-bit boundaries" it clearly states in the user guide that the core drops 2 bytes...missed it
