KSZ9021GN Ver la hoja de datos (PDF) - Micrel
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KSZ9021GN Datasheet PDF : 53 Pages
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Micrel, Inc.
KSZ9021GN
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.
LED pin
LED2
LED1
Pin State
H
L
H
Toggle
LED Definition Link / Activity
OFF
ON
OFF
Blinking
Link off
Link on (any speed)
No Activity
Activity (RX, TX)
Table 6. Single LED Mode – Pin Definition
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.
LED Pin
(State)
LED2
H
L
Toggle
H
H
L
Toggle
LED1
H
H
H
L
Toggle
L
Toggle
LED Pin
(Definition)
LED2 LED1
OFF
OFF
ON
OFF
Blinking OFF
OFF
ON
OFF
Blinking
ON
ON
Blinking Blinking
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)
Table 7. Tri-color Dual LED Mode – Pin Definition
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
26
M9999-091010-1.1
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