KSZ9567RTXI datasheet(16/232 Pages) MICROCHIP

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KSZ9567R

DS00002329D-page 16

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3.2.1

CONFIGURATION STRAPS

The KSZ9567R 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

CONFIGURATION

STRAP PIN

DESCRIPTION

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

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