Port FEC Mode - 2.1 English

Versal Devices Integrated 100G Multirate Ethernet MAC Subsystem Product Guide (PG314)

Document ID
PG314
Release Date
2023-07-11
Version
2.1 English

Forward error correction (FEC) is available on the PHYs of the MRMAC port. FEC can be enabled or disabled on a per-port basis.

The FEC_CONFIGURATION_REG needs to be configured appropriately for the FEC to work. For example, the Clause 49 flag should be set to 1 for modes which require Clause 49 transcoding (25GE, 50GE, Fibre Channel) and set to 0 for modes which require Clause 82 transcoding (100GE). CTL_TX_FEC_FOUR_LANE_PMD needs to set to 1 for 100CAUI-4 with RSFEC (it should be set to 0 100GAUI-2 and other modes). For additional details, please refer to the Register description sheet of MRMAC Register document.

The various FEC operating modes are selected through the ctl_fec_mode field of the FEC_CONFIGURATION_REG configuration register. A change in the FEC_CONFIGURATION_REG of the port requires a reset being driven to that port after configuration is complete.

Table 1. FEC Operating Modes
MRMAC Port Operating Rate ctl_fec_mode_<N>[3:0] Description
0 All rates 'b0000 FEC Disabled
100GE 'b1000 IEEE 802.3 RS(528,514) FEC
'b1010 IEEE P802.3cd/D3.5 CL91 RS(544,514) FEC
'b1011 ITU-T FlexEO RS(544,514) FEC
50GE 'b0100 25G/50G Ethernet Consortium RS(528,517) FEC
'b0101 IEEE P802.3cd/D3.5 CL134 RS(544,514) FEC
'b1111 IEEE 802.3 CL74 FEC
40GE 'b1101 IEEE 802.3 CL74 FEC
25GE 'b0010 25G/50G Ethernet Consortium RS(528,514) FEC
'b0011 IEEE 802.3 CL108 RS(528,514) FEC
'b1110 IEEE 802.3 CL74 FEC
10GE 'b1100 IEEE 802.3 CL74 FEC
32GFEC 'b0001 32GFEC (Valid only for Flex Interface)
1 All rates 'b0000 FEC Disabled
25GE 'b0010 25G/50G Ethernet Consortium RS(528,514) FEC
'b0011 IEEE 802.3 CL108 RS(528,514) FEC
'b1110 IEEE 802.3 CL74 FEC
10GE 'b1100 IEEE 802.3 CL74 FEC
32GFEC 'b0001 32GFEC (Valid only for Flex Interface)
2 All rates 'b0000 FEC Disabled
50GE 'b0100 25G/50G Ethernet Consortium RS(528,514) FEC
'b0101 IEEE P802.3cd/D3.5 CL134 RS(544,514) FEC
'b1111 IEEE CL74 25/50GE Ethernet Consortium
25GE 'b0010 25G/50G Ethernet Consortium RS(528,514) FEC
'b0011 IEEE 802.3 CL108 RS(528,514) FEC
'b1110 IEEE 802.3 CL74 FEC
10GE 'b1100 IEEE 802.3 CL74 FEC
32GFEC 'b0001 32GFEC (Valid only for Flex Interface)
3 All rates 'b0000 FEC Disabled
25GE 'b0010 25G/50G Ethernet Consortium RS(528,514) FEC
'b0011 IEEE 802.3 CL108 RS(528,514) FEC
'b1110 IEEE 802.3 CL74 FEC
10GE 'b1100 IEEE 802.3 CL74 FEC
32GFEC 'b0001 32GFEC (Valid only for Flex Interface)