RGMII to GMII Bridge

LatticeReferenceDesign-LogoGMII (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 principle objective of RGMII is to reduce the number of pins from 22 down 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.

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 - Source Code
RD1022 2.3 11/18/2016 ZIP 478 KB
RGMII to GMII Bridge Reference Design
Also download the source code below
RD1022 2.3 11/18/2016 PDF 279.7 KB