A problem with the F-Tile Ethernet Multirate IP in the Quartus® Prime Pro Edition software version 25.3 and earlier for 2x50GE-1 port P2 in UMR3 Dynamic Reconfiguration (DR) group (100G-4 PTP) may result in PTP accuracy error exceeding 8 ns.

Description

Due to a problem with the F-Tile Ethernet Multirate IP in the Quartus® Prime Pro Edition software version 25.3 and earlier, PTP may fail to meet the 8 ns accuracy requirement, specifically at the 2x50GE-1. This problem is limited to the 2x50GE-1 rate second port P2; Additionally, the F-Tile Ethernet Multirate IP does not exhibit PTP problems for rates other than 2x50GE-1. 

As a result of the problem described above, you may experience a similar problem in the F-Tile Dynamic Reconfiguration Suite IP available Example Design when selecting the following options from the GUI under the available Example Designs tab: (1) setting the protocol/mode to Ethernet, and (2) choosing the base variant 100G-4 PTP as shown in Table 10 of section section 3.1.2. Specifically, the example design for implementing 100G-4 PTP to 2x50G-1 PTP does not meet the specifications outlined in the F-Tile Ethernet IP User Guide, resulting in PTP accuracy errors for 2x50G-1 PTP. Other configurations within the same design are unaffected. Below are failure signatures in the Quartus® Prime Pro Edition software version 25.3. 

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Comparison #1 
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RX_ITS - TX_ETS       : 0xffffffffc7b07c00/-14415.5156 ns 

TX Timestamp Fields   : 0x3031323334353637BBCC 
RX Timestamp Fields   : 0x3031323334353637BBCC 

TX Correction Fields  : 0x16AA18191A1B1C1D 
RX Correction Fields  : 0x16AA18191A1B1C1D 

        ERROR: PTP Failed  

---------------- Done for 50G mode---------------- 

Resolution

As a workaround for this problem, it is recommended not to use 2x50G-1 for 2-port configurations when PTP is enabled in the F-Tile Ethernet Multirate IP in the Quartus® Prime Pro Edition software version 25.3.

This problem is scheduled to be fixed in a future release of the Quartus Prime Pro Edition software.