ff_rx_mod in TSE bug?

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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 I want to transmit only the the first 2 bytes of the 32-bit word. The TSE still transmits all four bytes. I'm using the cyclone III 120 Dev. Board and actually connected the two ff_tx_mod signals to two dip switches, just for testing, and transmitted the same data in all modes and got an error in all modes.

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I have a similar problem.

With signaltap i can see that tx_mod is properly set ('10') but the TSE refuse to transmit these 2 bytes...

I've done it with 11.1sp2