EVB-LAN9353 Datasheet, PDF (25/43 Pages) Microchip Technology – EVB-LAN9353 Evaluation Board User’s Guide

3.1.8 I2C Aardvark^® Header
J16 connector is used for I2C Aardvark header. Respective pin details are given below
in Table 3-17.
TABLE 3-17: PIN NAMES FOR I2C AARDVARK HEADER
Signal Name
Pin Number
I2C2_SCL
J16.1
I2C2_SDA
J16.3
GND
J16.2 & J16.10
3.1.9 Copper and Fiber Mode Selections
The LAN9353 supports 100BASE-TX (Copper) and 100BASE-FX (Fiber) modes. In
100BASE-FX operation, the presence of the receive signal is indicated by the external
transceiver as either an open-drain, CMOS level, Loss of Signal (SFP) or a LVPECL
Signal Detect (SFF).
This EVB supports 100BASE-TX (Copper) and 100BASE-FX (Fiber) in SFP mode. By
default Copper Mode is active. Fiber Mode is supported as an assembly option. To
select the Copper or Fiber Mode, the respective strap and signal routing resister
assembly options must to be configured.
Note: Vendor part number for SFP Transceiver: Finisar/FTLF1217P2.
3.1.9.1 COPPER MODE
The EVB-LAN9353 is set to Copper Mode by default. Table 3-18 details the required
strap resistors settings for Copper Mode operation.
TABLE 3-18: COPPER MODE STRAP RESISTORS
Resistors Signal Names
Description
R79 (10K)
FXLOSEN
Copper twisted pair for ports A and B further determined
by FXSDENA and FXSDENB
R76, R80 (10K) FXSDA/FXSDB Configures Port 0 and Port 1 to Copper Mode
Note: R75, R77, and R78 must not be populated (DNP).
Additionally, the signal routing resistors detailed in Table 3-19 must be assembled for
Copper Mode operation.
TABLE 3-19: COPPER MODE SIGNAL ROUTING RESISTORS
Resistors
Description
R17, R19, R21, R23
R31, R33, R35, R37
Port 0 Copper mode is Enabled
Port 1 Copper mode is Enabled
Note: R16, R18, R20, R22, R30, R32, R34, and R36 (0402 package) must not be
populated (DNP).
3.1.9.2 FIBER MODE
The LAN9353 supports SFP type 100BASE-FX mode. To enable Fiber Mode, the
respective strap and signal routing resisters must be configured.
Note: Copper Mode related resistors must be DNP while Fiber Mode is active
(See Section 3.1.9.1 “Copper Mode”).
 2015 Microchip Technology Inc.
DS50002393A-page 25