LAN9221i SMSC [SMSC Corporation], LAN9221i Datasheet - Page 19

• Manufacturer Part Number: LAN9221i
• Description: High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
• Manufacturer: SMSC [SMSC Corporation]

High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
Datasheet
SMSC LAN9221/LAN9221i
Auto-MDIX Enable
Activity Indicator),
Common Ground
General Purpose
+3.3V Regulator
Variable Voltage
nLED1 (Speed
nLED2 (Link &
nLED3 (Full-
Power Supply
Indicator
I/O Power
Indicator),
I/O data,
Duplex
NAME
Test
).
VDD33REG
AMDIX_EN
VDDVARIO
GPIO[2:0]/
nLED[3:1]
SYMBOL
TEST
VSS
Table 2.4 System and Power Signals (continued)
BUFFER
VOD12
VO12/
TYPE
(PU)
(PD)
VIS
VIS/
VIS
P
P
P
DATASHEET
19
1 pad
PINS
NUM
1
1
3
4
1
Variable Voltage I/O logic power supply pins.
Common Ground
Enables Auto-MDIX. Pull high or leave
unconnected to enable Auto-MDIX, pull low to
disable Auto-MDIX.
Note:
Reserved for internal test purposes only.
Note:
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
LAN9221/LAN9221i 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.
Refer to
on page 139
+3.3V power supply for internal +1.8V regulator.
Section 7.2, "Operating Conditions**,"
When operating at reduced
VDDVARIO voltage levels (less than
3.0V), this pin must be pulled to a valid
level with an external resistor. Refer to
Section 2.2, "External Pull-Up/Pull-
Down Resistors"
When operating at a reduced
VDDVARIO voltage (less than 3.0V),
this pin must be connected to ground
or pulled-low with an external resistor.
When VDDVARIO = 3.3V, this pin may
be left unconnected. Refer to
2.2, "External Pull-Up/Pull-Down
Resistors"
for additional details.
DESCRIPTION
for more information.
for more information.
Revision 2.6 (12-04-08)
Section