KSZ9021GN TR Micrel Inc, KSZ9021GN TR Datasheet - Page 26

• Manufacturer Part Number: KSZ9021GN TR
• Description: Specifications: Number of Drivers/Receivers: 8/8 ; Type: Transceiver ; Voltage - Supply: 3.135 V ~ 3.465 V ; Package / Case: 64-VFQFN Exposed Pad ; Packaging: Tape & Reel (TR) ; Protocol: Gigabit Ethernet ; Lead Free Status: Lead Free ; RoHS Stat
• Manufacturer: Micrel Inc

Micrel, Inc.
Single LED Mode
In Single LED Mode, the LED2 pin indicates the link status while the LED1 pin indicates the activity status, as shown in
the following table.
Tri-color Dual LED Mode
In Tri-color Dual LED Mode, the Link and Activity status are indicated by the LED2 pin for 1000Base-T, by the LED1 pin
for 100Base-TX, and by both LED2 and LED1 pin, working in conjunction, for 10Base-T. This is summarized in the
following table.
Each LED output pin can directly drive a LED with a series resistor (typically 220Ω to 470Ω).
For activity indication, the LED output toggles at approximately 12.5Hz (80ms) to ensure visibility to the human eye.
September 2010
LED Pin
(State)
LED2
H
L
Toggle
H
H
L
Toggle
LED pin
LED2
LED1
LED1
H
H
H
L
Toggle
L
Toggle
Table 7. Tri-color Dual LED Mode – Pin Definition
Table 6. Single LED Mode – Pin Definition
Pin State
H
L
H
Toggle
Blinking
LED Pin
(Definition)
LED2
OFF
ON
Blinking
OFF
OFF
ON
LED Definition
OFF
ON
OFF
Blinking
LED1
OFF
OFF
OFF
ON
Blinking
ON
Blinking
26
Link / Activity
Link off
1000 Link / No Activity
1000 Link / Activity (RX, TX)
100 Link / No Activity
100 Link / Activity (RX, TX)
10 Link / No Activity
10 Link / Activity (RX, TX)
Link off
Link on (any speed)
No Activity
Activity (RX, TX)
Link / Activity
M9999-091010-1.1
KSZ9021GN