Datasheet

High Performance Single-Chip 10/100 Non-PCI Ethernet Controller
Datasheet
SMSC LAN9118 19 Revision 1.5 (07-11-08)
DATASHEET
100,
99, 98
General Purpose
I/O data,
nLED1 (Speed
Indicator),
nLED2 (Link &
Activity Indicator),
nLED3 (Full-
Duplex
Indicator
).
GPIO[2:0]/
LED[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.
GPIO signals are Schmitt-triggered
inputs. When configured as LED
outputs these signals are open-drain.
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 LAN9118 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.
10 RBIAS RBIAS AI 1
PLL Bias: Connect to an external
12.0K ohm 1.0% resistor to ground.
Used for the PLL Bias circuit.
9Test Pin ATEST I1
This pin must be connected to VDD
for normal operation.
2 Internal Regulator
Power
VREG P 1 3.3V input for internal voltage
regulator
20,28,
35,
42,48,
55,61,
97
+3.3V I/O Power VDD_IO P 8 +3.3V I/O logic power supply pins
19,27,
34,41,
47,54,
60,96
I/O Ground GND_IO P 8 Ground for I/O pins
81,85,
89
+3.3V Analog
Power
VDD_A P 3 +3.3V Analog power supply pins. See
Note 2.1
77,80,
86,88
Analog Ground VSS_A P 4 Ground for analog circuitry
Table 2.5 System and Power Signals (continued)
PIN
NO.
NAME SYMBOL
BUFFER
TYPE
NUM
PINS
DESCRIPTION