TSE_MAC writing extra bits

Altera_Forum · ‎12-22-2011

Hello i am mounting some UDP packages inside NIOS2 and sending them via ETH0, however i am getting some malformed packages errors when i take a look at them with Wireshark.

I tried to increase the data and instruction cache to 16/32K but no improvements happened. I am using altera TSE mac at a DE2-115,

When my eth interface sends the packet it always try to complete 32 bits

For exemple

0A 0B 0C 0D

0E 0F

is a valid package

but eth0 is writing

0A 0B 0C 0D

0E 0F 00 00

Any suggestions?

Altera_Forum · ‎12-22-2011

The MAC has an option to align data to 32bit boundary, so add 16 bits of any data in the begining of the data OR disable that option.

Altera_Forum · ‎12-22-2011

Ok but why the ping doesnt align the data?

When i ping with my DE2-115 everything is ok at the wireshark and it isnt aligned.

I also disabled the option to align at the MAC but nothing changed.

Altera_Forum · ‎12-23-2011

Strange, it had to change the alignment. The alignment is probably can be done in TCP/IP stack. Check that too.