Triple-Speed Ethernet Intel® FPGA IP User Guide

ID 683402
Date 5/30/2022
Document Table of Contents

10.3. PHY Definition

By default, the software driver only supports the following PHYs:
  • National DP83848C (10/100 Mbps)
  • National DP83865 (10/100/1000 Mbps)
  • Marvell 88E1111 (10/100/1000 Mbps)
  • Marvell 88E1145 (Quad PHY, 10/100/1000 Mbps).

You can extend the software driver to support other PHYs by defining the PHY profile using the structure alt_tse_phy_profile and adding it to the system using the function alt_tse_phy_add_profile(). For each PHY instance, use the structure alt_tse_system_phy_struct to define it and the function alt_tse_system_add_sys() to add the instance to the system.

The software driver automatically detects the PHY’s operating mode and speed if the PHY conforms to the following specifications:

  • One bit to specify duplex and two consecutive bits (the higher bit being the most significant bit) to specify the speed in the same extended PHY specific register.
  • The speed bits are set according to the convention shown in PHY Speed Bit Values.
Table 124.  PHY Speed Bit Values
Speed (Mbps) PHY Speed Bits
1000 1 0
100 0 1
10 0 0

For PHYs that do not conform to the aforementioned specifications, you can write a function to retrieve the PHY’s operating mode and speed, and set the field *link_status_read in the PHY data structure to your function’s address.

Example of PHY Profile Structure

You can also execute a function to initialize a PHY profile or a PHY instance by setting the function pointer (*phy_cfg and *tse_phy_cfg) in the respective structures to the function’s address.

typedef struct alt_tse_phy_profile_struct{ /* PHY profile */

/*The name of the PHY*/
char name[80];

/*Organizationally Unique Identififier*/
alt_u32 oui;

/*PHY model number*/
alt_u8 model_number;

/*PHY revision number*/
alt_u8 revision_number;

/*The location of the PHY Specific Status Register*/
alt_u8 status_reg_location;

/*The location of the Speed Status bit in the PHY Specific Status
alt_u8 speed_lsb_location;

/*The location of the Duplex Status bit in the PHY Status Specific
alt_u8 duplex_bit_location;

/*The location of the Link Status bit in PHY Status Specific
alt_u8 link_bit_location;

/*PHY initialization function pointer—profile specific*/
alt_32 (*phy_cfg)(np_tse_mac *pmac);

/*Pointer to the function that reads and returns 32-bit link status.Possible status:
full duplex (bit 0 = 1), half duplex (bit 0 = 0),gigabit (bit 1 = 1),
100Mbps (bit 2 = 1), 10Mbps (bit 3 = 1),invalid speed (bit 16 = 1).*/
alt_u32 (*link_status_read)(np_tse_mac *pmac);

} alt_tse_phy_profile;

Example of PHY Instance Structure

typedef struct alt_tse_system_phy_struct { /* PHY instance */

/* PHY's MDIO address */
/* PHY initialization function pointer—instance specific */
alt_32 (*tse_phy_cfg)(np_tse_mac *pmac);

} alt_tse_system_phy;

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