RGMII to GMII Bridge Reference Design

Bi-directional bridge function for transferring data between RGMII and GMII

GMII (Gigabit Media Independent Interface) is an Ethernet interface standard, and RGMII (Reduced Gigabit Media Independent Interface) is intended to be an alternative to GMII. The principal objective of RGMII is to reduce the number of pins from 22 to 12 in a cost-effective and technology-independent manner. This reference design provides a bi-directional bridge function for transferring data between RGMII and GMII.

Features

  • Data bridging from GMII to RGMII
  • Data bridging from RGMII to GMII
  • Works at >125 MHz
  • Uses the HSTL I/Os with no additional HSTL buffers required

Jump to

Block Diagram

Performance and Size

Device Family Tested Devices* Performance I/O Pins Design Size Revision
ECP5™ 4 LFE5UM-85F-8MG756C >125 MHz 33 4 LUTs 2.2
LatticeECP3™ 1 LFE3-95EA-7FN1156C >125 MHz 33 4 LUTs 2.2
LatticeECP™/
LatticeEC™ 2
LFEC20E-4F672C >125 MHz 33 3 LUTs 2.2
LatticeXP™ 3 LFXP10E-4F256C, >125 MHz 33 3 LUTs 2.2

1. Performance and utilization characteristics are generated using LFE3-95EA-7FN1156C, with Lattice Diamond 3.1 design software.
2. Performance and utilization characteristics are generated using LFEC20E-4F672C, with Lattice Diamond 3.1 design software.
3. Performance and utilization characteristics are generated using LFXP10E-4F256C, with Lattice Diamond 3.1 design software.
4. Performance and utilization characteristics are generated using LFE5UM-85F-8MG756C, with Lattice Diamond 3.1 design software with LSE (Lattice Synthesis Engine).

* May work in other devices as well.

Note: The performance and design sizes shown above are estimates only. The actual results may vary depending upon the chosen parameters, timing constraints, and device implementation. See the design's documentation for details. All coding and design work was done on a PC platform unless noted otherwise.

Documentation

Technical Resources
TITLE NUMBER VERSION DATE FORMAT SIZE
RGMII to GMII Bridge Reference Design
FPGA-RD-02136 2.5 6/23/2021 ZIP 968.6 KB
RGMII to GMII Bridge - Source Code
FPGA-RD-02136 2.5 6/23/2021 ZIP 968.6 KB

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