Xilinx Virtex UltraScale+ FPGAs - Page 110

Table 67: RX FEC Attributes (cont'd)
Attribute Type Description
FEC_RX1_BYPASS_CORRECTION [1] FEC RX slice 1 error correction select:
1’b0: Error correct enabled.
1’b1: Error correct disabled.
FEC_RX0_BYPASS_INDICATION [2] FEC RX slice 0 error indicator enable:
1’b0: Error indicator enabled.
1’b1: Error indicator disabled.
FEC_RX1_BYPASS_INDICATION [3] FEC RX slice 1 error indicator enable:
1’b0: Error indicator enabled.
1’b1: Error indicator disabled.
FEC_CFG1[15:0] (FEC_RX0_VL_LENGTH[15:0])
FEC_CFG3[4] (FEC_RX0_VL_LENGTH[16])
17-bit Binary Frame length (in 66-bit blocks per PCS lane)
for FEC RX slice 0. Ignored if FEC RX slice 0 is
configured in raw FEC mode.
FEC_CFG2[15:0] (FEC_RX1_VL_LENGTH[15:0])
FEC_CFG3[5] (FEC_RX1_VL_LENGTH[16])
17-bit Binary Frame length (in 66-bit blocks per PCS lane)
for FEC RX slice 1. Ignored if FEC RX slice 1 is
configured in raw FEC mode.
FEC_CFG4[15:0] (FEC_RX_VL_MARKER_ID0[15:0])
FEC_CFG5[15:0] (FEC_RX_VL_MARKER_ID0[31:16])
FEC_CFG6[15:0] (FEC_RX_VL_MARKER_ID0[47:32])
FEC_CFG7[15:0] (FEC_RX_VL_MARKER_ID0[63:48])
64-bit Binary Alignment marker 0 (common), for 50GE
operation on FEC RX slice 0, and for 100GE,
FlexO, and Interlaken operation on FEC RX
slices 0–1.
FEC_CFG8[15:0] (FEC_RX_VL_MARKER_ID1[15:0])
FEC_CFG9[15:0] (FEC_RX_VL_MARKER_ID1[31:16])
FEC_CFG10[15:0]
(FEC_RX_VL_MARKER_ID1[47:32])
FEC_CFG11[15:0]
(FEC_RX_VL_MARKER_ID1[63:48])
64-bit Binary
Alignment marker 0 (common) for 50GE
operation on FEC RX slice 1. Ignored if FEC
RX slice 0 is configured in 100G mode.
FEC_CFG12[15:0] (FEC_RX_VL_MARKER_ID4[15:0])
FEC_CFG13[15:0]
(FEC_RX_VL_MARKER_ID4[31:16])
FEC_CFG14[15:0]
(FEC_RX_VL_MARKER_ID4[47:32])
FEC_CFG15[15:0]
(FEC_RX_VL_MARKER_ID4[63:48])
64-bit Binary
Alignment marker 4 (lane-specific) for
100GE, FlexO, and Interlaken operation on
FEC RX slice 0–1. Alignment marker 2 (lane-
specific) for 50GE operation on FEC RX slice
0.
FEC_CFG16[15:0] (FEC_RX_VL_MARKER_ID5[15:0])
FEC_CFG17[15:0]
(FEC_RX_VL_MARKER_ID5[31:16])
FEC_CFG18[15:0]
(FEC_RX_VL_MARKER_ID5[47:32])
FEC_CFG19[15:0]
(FEC_RX_VL_MARKER_ID5[63:48])
64-bit Binary
Alignment marker 5 (lane-specific) for
100GE, FlexO, and Interlaken operation on
FEC RX slice 0–1.
RS-FEC Sub-Modes
There are three sub-modes of RS-FEC decoder operaon dened by the IEEE 802.3bj
specicaon. The primary purpose of the dierent sub-modes is to allow latency to be reduced
in cases where the line BER is low enough that full error correcon is not required. The following
table lists the valid RS-FEC operang sub-modes. When congured in 2x50G FEC mode, the sub-
mode can be set independently for each slice.
Chapter 4: Receiver
UG581 (v1.0) January 4, 2019 www.xilinx.com
Virtex UltraScale+ GTM Transceivers 110
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