LAN83C183 Datasheet, PDF (50/113 Pages) SMSC Corporation – FAST ETHERNET PHYSICAL LAYER DEVICE

2.5 LEDS
PLED5n
Receive LED Output Pullup O.D.
O
The function of this pin is to be a Receive Activity Detect output. The
pin can drive an LED from V_DD.
PLED5n
Pin
HIGH
LOW
Function
No receive activity
Receive packet occurred (held LOW for 100 ms)
PLED4n
Transmit LED Output Pullup O.D.
O
The function of this pin is to be a Transmit Activity Detect output. The
pin can drive an LED from V_DD.
PLED4n
Pin
HIGH
LOW
Function
No transmit activity
Transmit packet occurred (held LOW for 100 ms)
PLED3n/MDA3n
Programmable LED Output/MI Address Bit
Pullup O.D. I/O
The default function of this pin is to be a 100 Mbits/s Link Detect out-
put. This pin can also be programmed through the MI serial port to
indicate other events or be user controlled. This pin can drive an LED
from V_DD.
When programmed as a 100 Mbits/s Link Detect Output (default):
PLED3n/MDA3n
Pin
HIGH
LOW
Function
No Link Detect
100 Mbits/s Link Detected
During powerup or reset, this pin is high-impedance and the level on
this pin is latched in as the physical device address MDA3n for the
MI serial port.
PLED2n/MDA2n
Programmable LED Output/MI Address Bit
Pullup O.D. I/O
The default function of this pin is to be an Activity Detect output. This
pin can also be programmed through the MI serial port to indicate
other events or be user controlled. This pin can drive an LED from
V_DD.
When programmed as an Activity Detect Output (default):
PLED2n/MDA2n
Pin
HIGH
LOW
Function
No Activity
Transmit or receive packet
occurred (held LOW for 100 ms)
During powerup or reset, this pin is high-impedance and the level on
this pin is latched in as the physical device address MDA2n for the
MI serial port.
SMSC DS – LAN83C183
50
Rev. 12/14/2000