Datasheet

ManualsBrandsMicrochip ManualsIntegrated Circuits (ICs)3-Port Managed Ethernet Switch Ethernet/Fiber/MAC/PHY/MII LQFP-64

KSZ8873MLL/FLL/RLL

DS00002348A-page 8  2017 Microchip Technology Inc.

36 SMRXC3/NC I/O

MLL/FLL: Switch MII receive clock.

Output in PHY MII mode

Input in MAC MII mode

RLL: No Connection.

37 GND GND Digital ground

38 VDDC P 1.8V digital core power input from VDDCO (pin 56).

39 SPIQ Ipu/O

SPI slave mode: serial data output

Note: an external pull-up is needed on this pin when it is in use.

Strap option: XCLK Frequency Selection

PU = 25 MHz

PD = 50 MHz

40 SPISN Ipu

SPI slave mode: chip select (active-low)

When SPISN is high, the KSZ8873MLL/FLL/RLL is deselected and SPIQ is

held in high impedance state.

A high-to-low transition is used to initiate SPI data transfer.

Note: an external pull-up is needed on this pin when it is in use.

41 INTRN Opu

Interrupt

Active-low signal to host CPU to indicate an interrupt status bit is set when

lost link. Refer to register 187 and 188.

42 SCL_MDC I/O

SPI slave mode/I

C slave mode: clock input

C master mode: clock output

MIIM clock input

43 SDA_MDIO Ipu/O

SPI slave mode: serial data input

C master/slave mode: serial data input/output

MIIM: data input/output

Note: an external pull-up is needed on this pin when it is in use.

44 NC NC

Unused pin, only this NC pin can be pulled down by a pull-down resistor for

better EMI.

45 P1ANEN Ipu/O

PU = enable auto-negotiation on port 1

PD = disable auto-negotiation on port 1

46 P1SPD Ipu/O

PU = force port 1 to 100BT if P1ANEN = 0

PD = force port 1 to 10BT if P1ANEN = 0

47 P1DPX Ipu/O

PU = port 1 default to full-duplex mode if P1ANEN = 1 and auto-negotiation

fails. Force port 1 in full-duplex mode if P1ANEN = 0.

PD = port 1 default to half-duplex mode if P1ANEN = 1 and auto-negotiation

fails. Force port 1 in half-duplex mode if P1ANEN = 0.

48 GND GND Digital ground

49 VDDC P 1.8V digital core power input from VDDCO (Pin 56).

50 P1FFC Ipu/O

PU = always enable (force) port 1 flow control feature

PD = port 1 flow control feature enable is determined by auto-negotiation

result.

TABLE 2-1: SIGNALS (CONTINUED)

Number

Name

Type

Note

2-1

Description