Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

ff_rx_mod in TSE bug?

I am using the TSE with 32-bit wide data. When transmitting I'm using the ff_tx_mod[1:0] signal to truncate bytes off the last 32-bit word transmitted by the TSE. all modes work except mode "10" when...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

--- Quote Start ---

This is a bug since Avalon ST interface specifications said that the empty signal is evaluated only when eop is true. Interesting this odd behaviur is visible only with an empty value of '10'.

--- Quote End ---

I don't think that Altera tests this part a lot, because I had some problems with the SGDMA that did weird things if the empty signal wasn't "00" on a non-end-of-packet word. So now just to be safe on my IPs that generate an Avalon Stream I always ensure that empty is always "00", except on an end of packet where it is the expected value.