LogiCORE IP Tri-Mode Ethernet MAC v4.3 - Update needed to IO logic for Spartan-6 FPGA RGMII designs
Description
Keywords: TEMAC, Tri-speed, patch, IDELAY, DCM
The 4.3 release of the core had not been verified in hardware for Spartan-6. The RGMII I/O logic was therefore based upon static timing and timing simulation results both of which are based on pre-production speed files.
Solution
On further testing updates to the I/O logic is needed. The IODELAY2 usage needs to be replaced with a DCM. The core has been updated in the Tri-Mode Ethernet MACv4.3 rev1 patch to use a DCM for RGMII when targeting a Spartan-6 FPGA. See the tri_mode_eth_mac_v4_3_rev1.pdf provided in the patch for more details including updated clocking diagrams. To get the patch see:(Xilinx Answer 33307) LogiCORE IP Tri-Mode Ethernet MAC v4.3 - Release Notes and Known Issues for ISE 11.3