Recommended PHY to connect to Cyclone V 5CSXFC5D6F31I7N

Hello,

We are developing a product that includes Cyclone V P/N 5CSXFC5D6F31I7N.

We are using 2 of the HPS Ethernet ports with RGMII interface.

1. In the Evaluation Board, Intel used Microchips' KSZ9021RN PHY. This PHY is an obsolete device and we cannot use it in our design. Do you have any recommendation for an alternative device that can replace KSZ9021RN PHY ?

2. We are thinking about using Marvell PHY 88E1512P. According to the PHY's data sheet, it has by its default, a delay of minimum 1.2 nS on its Receive Path (Output PHY to MAC), and -0.9 ns Setup time on Tx Path (Input MAC to PHY).

This delay time is fixed for the TX and RX RGMII path (not like the KSZ9021RN) and it is set by default.

Is that good enough, or an additional delay should be added on the PCB? If yes how much?

Thanks

Avi