KSZ9021RL datasheet(10/67 Pages) MICROCHIP

Part #	KSZ9021RL

Description	Gigabit Ethernet Transceiver with RGMII Support

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Manufacturer	MICROCHIP [Microchip Technology]

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10 / 67 page

KSZ9021RL/RN

DS00003050A-page 10

 2009-2019 Microchip Technology Inc.

32

GTX_CLK

I

RGMII Mode:

RGMII TXC (Transmit Reference Clock) Input

33

TX_EN

I

RGMII Mode:

RGMII TX_CTL (Transmit Control) Input

34

VSS

Gnd

Digital ground

35

DVDDL

P

1.2V digital V

DD

36

RXD3 /

MODE3

I/O

RGMII Mode:

RGMII RD3 (Receive Data 3) Output /

Config Mode:

The pull-up/pull-down value is latched as MODE3 during power-up/

reset. See “Strapping Options” section for details.

37

DVDDH

P

3.3V/2.5V digital V

DD

38

RXD2 /

MODE2

I/O

RGMII Mode:

RGMII RD2 (Receive Data 2) Output /

Config Mode:

The pull-up/pull-down value is latched as MODE2 during power-

up/reset. See “Strapping Options” section for details.

39

VSS

Gnd

Digital ground

40

DVDDL

P

1.2V digital V

DD

41

RXD1 /

MODE1

I/O

RGMII Mode:

RGMII RD1 (Receive Data 1) Output /

Config Mode:

The pull-up/pull-down value is latched as MODE1 during power-up/

reset. See “Strapping Options” section for details.

42

RXD0 /

MODE0

I/O

RGMII Mode:

RGMII RD0 (Receive Data 0) Output /

Config Mode:

The pull-up/pull-down value is latched as MODE0 during power-up/

reset. See “Strapping Options” section for details.

43

RX_DV /

CLK125_EN

I/O

RGMII Mode:

RGMII RX_CTL (Receive Control) Output /

Config Mode:

Latched as CLK125_NDO Output Enable during power-up/reset.

See “Strapping Options” section for details.

44

DVDDH

P

3.3V/2.5V digital V

DD

45

RX_ER

O

RGMII Mode:

This pin is not used and should be left as a no connect.

46

RX_CLK /

PHYAD2

I/O

RGMII Mode:

RGMII RXC (Receive Reference Clock) Output /

Config Mode:

The pull-up/pull-down value is latched as PHYAD[2] during power-

up/reset. See “Strapping Options” section for details.

47

CRS

O

RGMII Mode:

This pin is not used and should be left as a no connect.

Number

Pin Name

Type

(Note 1)

Pin Function

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