Altera 50G Interlaken MegaCore Function - Manual (Page 81)

Figure 9-1: Straight Lane Order
Lane N
.
.
.
Lane 2
Lane 1
Lane 0
• Swapped Lane order. The transmitter sends Interlaken blocks sequentially across the lanes starting
with Lane 0, ending with Lane N. The receiver takes in Interlaken blocks starting with Lane 0, ending
with Lane N.
Figure 9-2: Swapped Lane Order
Lane 1
Lane 2
Lane 0
.
.
.
Lane N
Two parameters determine lane order:
SWAP_TX_LANES
SWAP_RX_LANES
When a parameter is set to 0, the 50G Interlaken IP core implements the Straight Lane order. When a
parameter is set to 1, the 50G Interlaken IP core implements the Swapped Lane order. The TX and RX
parameters are independent and can be set separately.
To conform with the Interlaken specification, the default value of
SWAP_TX_LANES
and
SWAP_RX_LANES
is
1.
Note: Running traffic with incompatible lane swapping configuration results in CRC24 errors and
incorrect data at the receiver.
Related Information
Modifying Hidden Parameter Values on page 9-4
UG-01140
2015.05.04
SWAP_TX_LANES and SWAP_RX_LANES (Data Word Lane Swapping) 9-3
Advanced Parameter Settings Altera Corporation
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