void __3_2_1__CONFIGURATION_STRAPS() { /** * @group: 3.2.1 CONFIGURATION STRAPS * * @description: The KSZ9477S utilizes configuration strap pins to configure the device for different modes. While RESET_N is low, * these pins are hi-Z. Pull-up/down resistors are used to create high or low states on these pins, which are internally sam- * pled at the rising edge of RESET_N. All of these pins have a weak internal pull-up or pull-down resistor which provides * a default level for strapping. To strap an LED pin low, use a 750Ω to 1kΩ external pull-down resistor. To strap a non-LED * pin high, use an external 1kΩ to 10kΩ pull-up resistor to VDDIO. Once RESET_N is high, all of these pins become driven * outputs. * Because the internal pull-up/down resistors are not strong, consideration must be given to any other pull-up/down resis- * tors which may reside on the board or inside a device connected to these pins. * When an LED pin is directly driving an LED, the effect of the LED and LED load resistor on the strapping level must be * considered. This is the reason for using a small value resistor to pull an LED pin low. This is especially true when an * LED is powered from a voltage that is higher than VDDIO. * The configuration strap pins and their associated functions are detailed in Table 3-3. * * * TABLE 3-3: CONFIGURATION STRAP DESCRIPTIONS (CONTINUED) * +---------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+ * | Configuration Strap | Description | * | Pin | | * +---------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+ * | LED1_0 | Quiet-WIRE Filtering Enable | * | | 0: Quiet-WIRE filtering enabled | * | | 1: Quiet-WIRE filtering disabled (Default) | * +---------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+ * | LED1_1 | Flow Control (All Ports) | * | | 0: Flow control disabled | * | | 1: Flow control enabled (Default) | * +---------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+ * | LED2_1 | Link-up Mode (All PHYs) | * | | 0: Fast Link-up: Auto-negotiation and auto MDI/MDI-X are disabled | * | | 1: Normal Link-up: Auto-negotiation and auto MDI/MDI-X are enabled (Default) | * | | Note: Since Fast Link-up disables auto-negotiation and auto-crossover, it is suitable only for specialized applications. | * +---------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+ * | LED4_0, LED2_0 | When LED2_1 = 1 at strap-in (Normal Link-up): | * | | [LED4_0, LED2_0]: Auto-Negotiation Enable (All PHYs) / NAND Tree Test Mode | * | | 00: Reserved | * | | 01: Auto-negotiation disabled, forced as 100 Mbps and half duplex. Auto-MDI-X is on. | * | | 10: NAND Tree test mode | * | | 11: Auto-negotiation enabled (Default) | * | | | * | | When LED2_1 = 0 at strap-in (Fast Link-up; All PHYs Full-Duplex; Auto-negotiation and Auto-MDI-X are off): | * | | LED2_0: 1000BASE-T Master/Slave Mode, 100BASE-T MDI/MDI-X Mode (All PHYs) | * | | 0: 1000BASE-T: Slave Mode, 100BASE-T: MDI-X | * | | 1: 1000BASE-T: Master Mode (Default), 100BASE-T: MDI (Default) | * | | LED4_0: PHY Speed Select (All PHYs) | * | | 0: 1000BASE-T | * | | 1: 100BASE-TX (Default) | * +---------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+ * | LED4_1, LED3_1 | [LED4_1, LED3_1]: Management Interface Mode | * | | 00: MIIM (MDIO) | * | | 01: I2C | * | | 1x: SPI (Default) | * +---------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+ * | LED5_1 | Switch Enable at Startup | * | | 0: Start Switch is disabled. The switch will not forward packets until the Start Switch bit is set in the Switch Operation Register. | * | | 1: Start Switch is enabled. The switch will forward packets immediately after reset. (Default) | * +---------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+ * | RXD6_3, RXD6_2 | [RXD6_3, RXD6_2]: Port 6 Mode | * | | 00: RGMII (Default) | * | | 01: RMII | * | | 10: Reserved | * | | 11: MII | * +---------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+ * | RXD6_1 | Port 6 MII/RMII Mode | * | | 0: MII: PHY Mode (Default); RMII: Clock Mode. RMII 50MHz reference clock is output on REFCLKO6. (Default); RGMII: No effect | * | | 1: MII: MAC Mode; RMII: Normal Mode. RMII 50MHz reference clock is input on REFCLKI6.; RGMII: No effect | * +---------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+ * | RXD6_0 | Port 6 Speed Select | * | | 0: 1000Mbps Mode (Default) | * | | 1: 100Mbps Mode | * | | Note: If Port 6 is configured for MII or RMII, set the speed to 100Mbps. | * +---------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+ * | IBA | In-Band Management | * | | 0: Disable In-Band Management (Default) | * | | 1: Enable In-Band Management | * +---------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+ * | SYNCLKO | SGMII Mode C | * | | 0: Invalid | * | | 1: Normal SGMII operation. This pin must be strapped high for proper operation. (Default) | * +---------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+ * | INTRP_N | SGMII Mode J | * | | 0: Invalid | * | | 1: Normal SGMII operation. This pin must be strapped high for proper operation. (Default) | * +---------------------+--------------------------------------------------------------------------------------------------------------------------------------------------+ */ }