100GbE with KP-FEC uses two physical PAM4 coded lanes, also called, 100 Gigabit
Attachment Unit Interface (CAUI-2). It uses the RS(544,514) FEC. The two physical
lanes are supported by bit-multiplexing the RS-FEC core’s four PMA lanes pairwise
outside of the RS-FEC core. The remaining defined clients use the RS(528,514) FEC.
In the CPRI standard, the CPRI FEC refers to 32GFC. CPRI is like 32GFC except for the
line rate, which is 24 Gbps.
Table 35.
Supported FEC Specifications in Intel Stratix 10 E-Tiles
Supported RS-FEC Type
Compliance
RS-FEC (528, 514)
RS-FEC (544, 514)
IEEE 802.3 Clause 91
Table 36.
FEC Details in Intel Stratix 10 E-Tiles
Resource
Description
Number of RS-FEC blocks per E-Tile
6
Number of RS-FEC lanes per FEC block
4
RS-FEC block implementation
Hard
RS-FEC block locations
Between the transceiver interface and Ethernet Hard IP
(EHIP_TOP)
Related Information
AN 846: Intel Stratix 10 Forward Error Correction
3.3.1. RS-FEC Modes
Table 37.
Example Applications for Various FEC Modes
Supported RS-FEC
Modes
RS-FEC
Receives Data
From
Example Applications
Details
Fractured
EHIP_LANE
25GbE - NRZ w/FEC (528, 514)
You can configure all six FEC blocks per
E-Tile in this mode.
NRZ mode: Four lanes within a FEC block
operate independently for single lane
protocols.
FPGA core
CPRI 24G - NRZ w/ FEC (528, 514)
32GFC w/ FEC (528, 514)
Aggregate
EHIP_CORE
100GbE (4 x 25G) – NRZ w/ FEC
(528, 514)
100GbE (2 x 50G) – PAM4 w/ FEC
(544, 514)
You can configure a maximum of four out
of six FEC blocks per E-Tile in this mode.
Refer to
on page 81 for more
details.
Four lanes of a FEC block are used
together for multi-lane protocols, like
100GbE.
PMA Direct
128 GFC
Bypass
—
10GbE – NRZ
25GbE - NRZ w/o FEC
100GbE (4 x 25G) – NRZ w/o FEC
Protocols or applications that do not
need RS-FEC
You can configure RS-FEC blocks in many possible combinations depending on your
application requirements.
3. Intel Stratix 10 E-Tile Transceiver PHY Architecture
UG-20056 | 2019.02.04
Intel
®
Stratix
®
10 E-Tile Transceiver PHY User Guide
80