lan9420 Standard Microsystems Corp., lan9420 Datasheet - Page 19

• Manufacturer Part Number: lan9420
• Description: Lan9420/lan9420i Single-chip Ethernet Controller With Hp Auto-mdix Support And Pci Interface
• Manufacturer: Standard Microsystems Corp.

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
SMSC LAN9420/LAN9420i
NUM
PINS
1
1
1
1
1
1
1
Crystal Input
Ethernet TX
Ethernet TX
Ethernet RX
Ethernet RX
PHY Bias
Data Out
Data Out
Negative
Negative
External
Resistor
Positive
Positive
Data In
Data In
Crystal
NAME
Output
SYMBOL
EXRES
TPO+
TPO-
TPI+
TPI-
XO
XI
Table 2.5 PLL and Ethernet PHY Pins
BUFFER
TYPE
OCLK
ICLK
AIO
AIO
AIO
AIO
DATASHEET
AI
19
Crystal Input: External 25MHz crystal input. This pin
can also be driven by a single-ended clock oscillator.
When this method is used, XO should be left
unconnected.
Crystal Output: External 25MHz crystal output.
Ethernet Transmit Data Out Negative: The transmit
data outputs may be swapped internally with receive
data inputs when Auto-MDIX is enabled.
Ethernet Transmit Data Out Positive: The transmit
data outputs may be swapped internally with receive
data inputs when Auto-MDIX is enabled.
Ethernet Receive Data In Negative: The receive data
inputs may be swapped internally with transmit data
outputs when Auto-MDIX is enabled.
Ethernet Receive Data In Positive: The receive data
inputs may be swapped internally with transmit data
outputs when Auto-MDIX is enabled.
External PHY Bias Resistor: Used for the internal
PHY bias circuits. Connect to an external 12.4K 1.0%
resistor to ground.
DESCRIPTION
Revision 1.1 (03-31-08)