High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support
Datasheet
Table 2.5 System and Power Signals (continued)
PIN
NO.
BUFFER
TYPE
NUM
PINS
NAME
SYMBOL
DESCRIPTION
100,
99,98
General Purpose
I/O data,
nLED1 (Speed
Indicator),
GPIO[2:0]/
nLED[3:1]
IS/O12/
OD12
3
General Purpose I/O data: These
three general-purpose signals are
fully programmable as either push-
pull output, open-drain output or input
by writing the GPIO_CFG
configuration register in the CSR’s.
They are also multiplexed as GP LED
connections.
nLED2 (Link &
Activity Indicator),
nLED3 (Full-
Duplex
GPIO signals are Schmitt-triggered
inputs. When configured as LED
outputs these signals are open-drain.
Indicator).
nLED1 (Speed Indicator). This
signal is driven low when the
operating speed is 100Mbs, during
auto-negotiation and when the cable
is disconnected. This signal is driven
high only during 10Mbs operation.
nLED2 (Link & Activity Indicator).
This signal is driven low (LED on)
when the LAN9218i detects a valid
link. This signal is pulsed high (LED
off) for 80mS whenever transmit or
receive activity is detected. This
signal is then driven low again for a
minimum of 80mS, after which time it
will repeat the process if TX or RX
activity is detected. Effectively, LED2
is activated solid for a link. When
transmit or receive activity is sensed
LED2 will flash as an activity
indicator.
nLED3 (Full-Duplex Indicator). This
signal is driven low when the link is
operating in full-duplex mode.
PLL Bias: Connect to an external
12.0K ohm 1.0% resistor to ground.
Used for the PLL Bias circuit.
10
RBIAS
RBIAS
AI
1
This pin must be connected to VDD
for normal operation.
9
2
Test Pin
ATEST
VREG
I
1
1
Internal Regulator
Power
P
3.3V input for internal voltage
regulator
20,28,
35,
42,48,
55,61,
97
+3.3V I/O Power
I/O Ground
VDD_IO
P
P
8
+3.3V I/O logic power supply pins
19,27,
34,41,
47,54,
60,96
GND_IO
8
Ground for I/O pins
81,85,
89
+3.3V Analog
Power
VDD_A
VSS_A
P
P
3
4
+3.3V analog power supply pins. See
Note 2.1.
77,80,
86,88
Analog Ground
Ground for analog circuitry
SMSC LAN9218i
19
Revision 1.8 (06-06-07)
DATASHEET
SMSC [ SMSC CORPORATION ]
