Hi All,
I'm designing the Custom IP that communicates directly with the TSE Core via the Avalon-ST interface. I couldn't find information *how to detect* that the transmission has been suddenly broken (e.g. by disconnected fiber, etc.). As far as I understand from the TSE Guide the following should happen (bold signal names used below are from the Avalon-ST interface):
1.
error[4] is set (Table 6-7 - "Corrupted receive frame caused by a PHY error. The PHY has asserted an error on the receive GMII.")
2.
endofpacket - **is not set** -> because transmission has been "physically" interrupted, so the 'endofpacket' indicator (sequences: '/T/ /R/ /R/' or '/T/ /R/') had no chance to be sent ??
3.
valid signal deasserted (???) -> because there is no new valid data ???
4. Anything else that I'm missing ????
I know that besides that the link should be signaled as 'down', but this information is *not available* on the Avalon-ST interface
. Getting data from the Avalon-MM registers is also not an option.
The question is:
how to detect the suddenly broken transmission in order to prevent the hardware to be deadlocked waiting for the new data (
...and 'endofpacket') that never comes? Is there any way to do this other than using some kind of timeout mechanism ?
Any help or suggestions?
Regards,
Michal
