Micrel, Inc.
KSZ9021RL/RN
Pin Number
Pin Name
LED1 /
Type(1)
Pin Function
LED Output:
Config Mode:
17
I/O
Programmable LED1 Output /
PHYAD0
The pull-up/pull-down value is latched as PHYAD[0] during
power-up / reset. See “Strapping Options” section for details.
The LED1 pin is programmed by the LED_MODE strapping option (pin 41), and is
defined as follows.
Single LED Mode
Activity
Pin State LED Definition
No Activity
H
OFF
Activity (RX, TX)
Toggle
Blinking
Tri-color Dual LED Mode
Link / Activity
Pin State
LED Definition
LED2
LED1
LED2
OFF
LED1
Link off
H
L
H
OFF
1000 Link / No Activity
H
ON
OFF
1000 Link / Activity (RX, TX) Toggle
H
Blinking
OFF
OFF
100 Link / No Activity
H
L
ON
100 Link / Activity (RX, TX)
10 Link / No Activity
H
Toggle
L
OFF
Blinking
ON
L
ON
10 Link / Activity (RX, TX)
Toggle
Toggle
Blinking
Blinking
For Tri-color Dual LED Mode, LED1 works in conjunction with LED2 (pin 15) to
indicate 10 Mbps Link and Activity.
18
19
20
21
22
23
24
25
26
27
DVDDL
TXD0
P
1.2V digital VDD
I
I
RGMII Mode:
RGMII Mode:
RGMII Mode:
RGMII Mode:
1.2V digital VDD
RGMII Mode:
RGMII Mode:
1.2V digital VDD
RGMII Mode:
Config Mode:
RGMII TD0 (Transmit Data 0) Input
RGMII TD1 (Transmit Data 1) Input
RGMII TD2 (Transmit Data 2) Input
RGMII TD3 (Transmit Data 3) Input
TXD1
TXD2
I
TXD3
I
DVDDL
GTX_CLK
TX_EN
DVDDL
RXD3 /
MODE3
P
I
RGMII TXC (Transmit Reference Clock) Input
RGMII TX_CTL (Transmit Control) Input
I
P
I/O
RGMII RD3 (Receive Data 3) Output /
The pull-up/pull-down value is latched as MODE3 during
power-up / reset. See “Strapping Options” section for details.
28
RXD2 /
I/O
RGMII Mode:
Config Mode:
RGMII RD2 (Receive Data 2) Output /
MODE2
The pull-up/pull-down value is latched as MODE2 during
power-up / reset. See “Strapping Options” section for details.
29
30
31
VSS
Gnd
P
Digital ground
1.2V digital VDD
RGMII Mode:
Config Mode:
DVDDL
RXD1 /
MODE1
I/O
RGMII RD1 (Receive Data 1) Output /
The pull-up/pull-down value is latched as MODE1 during
power-up / reset. See “Strapping Options” section for details.
M9999-101309-1.1
October 2009
18
MICREL [ MICREL SEMICONDUCTOR ]
