AMD EFR-DI-CLAUSE74-FEC-SITE

Overview

EF R-DI-CLAUSE74-FEC-SITE from Xilinx is a LogiCORE IP core implementing IEEE 802.3 Clause 74 Forward Error Correction for Ethernet and Fibre Channel PHYs. It performs full (2112,2080) Fire code encoding/decoding, corrects up to 11-bit burst errors, operates at up to 425 MHz (28 Gb/s), and integrates alignment, transcoding, and scrambling functions - deployed in 10G/25G/40G/50G/100G Ethernet and 16G Fibre Channel systems.

For engineers reviewing the EFR-DI-CLAUSE74-FEC-SITE datasheet, pinout, applications, or equivalent options, this page delivers verified latency values, clock domain behavior, runtime-configurable error indication, sync-header marking control, and transceiver gearbox slip interface details essential for PHY integration and compliance validation.

Technical Context

The EFR-DI-CLAUSE74-FEC-SITE implements a deterministic, fully synchronous FEC engine with separate TX and RX clock domains (tx_clk/rx_clk), each supporting up to 425 MHz operation. It processes 66-bit data words across 32 cycles per 2112-bit codeword, with configurable error indication enabling or bypassing sync-header corruption on uncorrectable blocks.

Alignment is performed via rx_din_slip-driven transceiver gearbox slips, with stat_rx_aligned asserting upon successful lock. Latency varies by mode: 5 cycles (32.0 ns @156.25 MHz) for encode, 71 cycles (454.4 ns) for decode with indication enabled, and 45 cycles (288.0 ns) with indication bypassed - all confirmed in PG303 v1.0 Table 1.

Key Specifications

Availability

EF R-DI-CLAUSE74-FEC-SITE is available at Aetrix Electronics and suitable for 10G/25G/100G Ethernet PHY design, 16G Fibre Channel framer integration, and high-speed serial link development requiring stable component supply and long-term IP licensing continuity.

Supply support for EFR-DI-CLAUSE74-FEC-SITE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Xilinx (now part of AMD) is a semiconductor company specializing in programmable logic devices, FPGA-based system solutions, and high-performance IP cores for networking, aerospace, and datacenter applications.

The EFR-DI-CLAUSE74-FEC-SITE belongs to Xilinx's LogiCORE IP portfolio targeting high-speed communication PHY layers - designed specifically to offload IEEE-compliant FEC processing from soft logic and enable deterministic, low-latency Ethernet and Fibre Channel physical layer implementations.

FAQ

What is the exact function of EFR-DI-CLAUSE74-FEC-SITE in an Ethernet PHY stack?

EF R-DI-CLAUSE74-FEC-SITE implements the IEEE 802.3 Clause 74 KR FEC layer between the PCS and PMA in 10GBASE-R through 100GBASE-R Ethernet PHYs. It performs real-time encoding/decoding of the (2112,2080) Fire code, corrects up to 11-bit burst errors, handles alignment via transceiver gearbox slip, and manages sync-header marking - all as defined in IEEE 802.3-2015 Section 74. The EFR-DI-CLAUSE74-FEC-SITE is not a physical chip but a synthesizable RTL IP core for Xilinx UltraScale and UltraScale+ FPGAs.

Does EFR-DI-CLAUSE74-FEC-SITE require a license for deployment?

Yes, EFR-DI-CLAUSE74-FEC-SITE requires a commercial license for full functionality in hardware and simulation. It ships with Vivado Design Suite but operates under the Xilinx Core License Agreement. Evaluation and hardware timeout licenses may be available; license enforcement occurs at Vivado Synthesis, Implementation, and write_bitstream stages. The EFR-DI-CLAUSE74-FEC-SITE license level is verified only for existence - not feature tier - at each checkpoint.

What are the clocking requirements for EFR-DI-CLAUSE74-FEC-SITE?

EF R-DI-CLAUSE74-FEC-SITE uses two independent clock domains: tx_clk (for encoder and TX control) and rx_clk (for decoder and RX control), both supporting up to 425 MHz. For 10G Ethernet, tx_clk/rx_clk = 156.25 MHz; for 25G, 390.625 MHz. Resets tx_resetn and rx_resetn are active-Low and must be asserted until respective clocks stabilize. The EFR-DI-CLAUSE74-FEC-SITE does not include internal clock generation or management logic.

How does EFR-DI-CLAUSE74-FEC-SITE handle uncorrectable codewords?

When ctrl_rx_indication_en = 1, EFR-DI-CLAUSE74-FEC-SITE marks uncorrectable codewords by setting rx_dout[1:0] (sync headers) to binary 11 across all 32 output words - per IEEE 802.3-2015. The pattern is controlled by ctrl_rx_header_mark[31:0]. When ctrl_rx_indication_en = 0, uncorrectable data passes through unchanged. stat_cw_uncorrected pulses for one cycle per uncorrectable block, and stat_rx_aligned deasserts if alignment is lost - behavior confirmed in PG303 Sections 3.4 and 4.3.

Is EFR-DI-CLAUSE74-FEC-SITE compatible with non-Ethernet protocols?

Yes - EFR-DI-CLAUSE74-FEC-SITE is explicitly validated for 16G Fibre Channel (T11/15-253v2 rev 1.40, Section 5.3.1) and other standards adopting Clause 74 FEC, including 25/50G Gigabit Ethernet Consortium specifications. Its 66-bit interface, Fire code implementation, and alignment logic are protocol-agnostic at the PHY layer; integration requires matching the host framer's data format and gearbox control - as demonstrated in the provided example design for GTY transceivers.