XAUI Tx lane reversal

Hi kkaibara,

Thanks for your reply.

I have tried overriding logical lane 0 channel assignment restrictions. It works only for a duplex reverse swap. My swap is from a simplex point of view (only tx).

Simulating "altera_eth_10g_mac_xaui design example":

On the top level "tb.sv" I reversed xaui_tx_data in this manner:

xaui_rx_data[3] = xaui_tx_data[0]

xaui_rx_data[2] = xaui_tx_data[1]

xaui_rx_data[1] = xaui_tx_data[2]

xaui_rx_data[0] = xaui_tx_data[3]

When I tried swapping lanes in xgmii_tx_dc[71:0], I succeeded in overriding the "local fault" generation and I received the start-of-packet on xgmii_rx_dc[71:0]. The problem is with the last TXD and TXC of each frame.

ie.:

TX before lane reversal:

TXC[7:0] c0

TXD[63:0] 07 FD FA 88 f5 DC D7 D6

TX after lane reversal:

TXC[7:0] 30

TXD[63:0] 88 FA FD 07 D6 D7 DC f5

RX:

RXC[7:0] c8

RXD[63:0] fe FD FA 88 fe DC D7 D6

Can you understand what generates the 0xFE?

Thanks,

Dror