void __4_1_12__REMOTE_PHY_LOOPBACK() {
    /**
     * @group:       	4.1.12 REMOTE PHY LOOPBACK
     *
     * @description: 	This loopback mode checks the line (differential pairs, transformer, RJ-45 connector, Ethernet cable) transmit and
     * 					receive data paths between the KSZ9477S and its Ethernet PHY link partner, and is supported for 10/100/1000 Mbps
     * 					at full-duplex.
     * 					The loopback data path is shown in Figure 4-2 and functions as follows:
     * 					• The Ethernet PHY link partner transmits data to the KSZ9477S PHY port.
     * 					• Data received at the external pins of the PHY port is looped back without passing through the MAC and internal
     * 					switch fabric.
     * 					• The same KSZ9477S PHY port transmits data back to the Ethernet PHY link partner.
     *
     *
     *
     * 					FIGURE 4-2: REMOTE PHY LOOPBACK
     * 					------------------------------------------------------------------
     *
     * 								  +-------------------------------------------------+
     * 					              | Device PHY Port N (1-5)                         |
     * 					        +---+ |  +------------+  +-----+  +-------------+       |
     * 					RJ-45   |RJ |-|--| 10/100/1000|--| MAC |--| Switch      |       |
     * 					+---+   |-45|-|  | PHY        |->|     |--| Fabric      |       |
     * 					|   |   +---|-|  +----^-------+  +-----+  +-------------+       |
     * 					| +-|-------|-|       |                                         |
     * 					| | |       | |       +------------------v                      |
     * 					| | +-------| |                                                 |
     * 					+-----------+ |                                                 |
     * 					              +-------------------------------------------------+
     *					                    |
     * 					                    | CAT-5 (UTP)
     * 					                    |
     * 					                    v
     * 					        +-----------+
     * 					        |           |
     * 					| +-|-------|-|     |
     * 					| | |       | | +---|--+-----+
     * 					| | +-------| |-| RJ-45|     |
     * 					| +-|-------|-| +---|--+-----+
     * 					+---+   +---|-|     | Ethernet PHY Link Partner
     * 					RJ-45   |-45|-|     |
     * 					+---+   +---|-|     |
     * 					              +-----+
     *
     *
     * 					The following programming steps and register settings are for remote PHY loopback mode for 1000BASE-T Master
     * 					Mode, 1000BASE-T Slave Mode, 100BASE-TX Mode, and 10BASE-T Mode.
     *
     * 					• 1000BASE-T Master Mode
     * 					- Set Port N (1-5), PHY 1000BASE-T Control Register = 0x1F00
     * 					- Set Port N (1-5), PHY Remote Loopback Register = 0x01F0
     * 					- Set Port N (1-5), PHY Basic Control Register = 0x1340
     *
     * 					• 1000BASE-T Slave Mode
     * 					- Set Port N (1-5), PHY 1000BASE-T Control Register = 0x1300
     * 					- Set Port N (1-5), PHY Remote Loopback Register = 0x01F0
     *
     * 					• 100BASE-TX Mode
     * 					- Set Port N (1-5), PHY Auto-Negotiation Advertisement Register = 0x0181
     * 					- Set Port N (1-5), PHY 1000BASE-T Control Register = 0x0C00
     * 					- Set Port N (1-5), PHY Remote Loopback Register = 0x01F0
     * 					- Set Port N (1-5), PHY Basic Control Register = 0x3300
     *
     * 					• 10BASE-T Mode
     * 					- Set Port N (1-5), PHY Auto-Negotiation Advertisement Register = 0x0061
     * 					- Set Port N (1-5), PHY 1000BASE-T Control Register = 0x0C00
     * 					- Set Port N (1-5), PHY Remote Loopback Register = 0x01F0
     * 					- Set Port N (1-5), PHY Basic Control Register = 0x3300
     */
}