EVB-LAN9353 Datasheet, PDF (26/43 Pages) Microchip Technology – EVB-LAN9353 Evaluation Board User’s Guide

EVB-LAN9353 Evaluation Board User’s Guide
3.2 LEDS
Table 3-20 details the required strap resistor settings for Fiber Mode operation.
TABLE 3-20: FIBER MODE STRAP RESISTORS
Resistors
Description
R77 (10K)
Configures Port 0 & 1 to FX_LOS Mode
R75, R78 (10K)
Configures Port 0 & 1 to Fiber mode, respectively
Note: R76, R79, and R80 must not be populated (DNP).
Additionally, the signal routing resistors detailed in Table 3-21 must be assembled for
Fiber Mode operation.
TABLE 3-21: FIBER MODE SIGNAL ROUTING RESISTORS
Resistors
Description
R16, R18, R20, R22
Port 0 Fiber mode Enabled
R30, R32, R34, R36
Port 1 Fiber mode Enabled
Note: R17, R19, R21, R23, R31, R33, R35, and R37 (0402 package) must not be
populated (DNP).
3.1.9.3 FX-LOS FIBER MODE STRAP
FX-LOS strap details are shown in Table 3-22. These strap settings determine if the
ports are to operate in FX-LOS Fiber Mode or FX-SD/Copper Mode.
TABLE 3-22: FX-LOS MODE STRAP SETTINGS
R77 (10K)
R79 (10K)
Reference
Voltage (v)
Function
Populate
Populate
DNP
DNP
Populate
Populate
3.3
1.5
0 (Default)
A level above 2V selects FX-LOS for Port 0 and Port 1
A level of 1.5V selects FX-LOS for Port 0 and FX-SD /
Copper twisted pair for Port 1, further determined by
FXSDB
A level of 0V selects FX-SD / Copper twisted pair for
Ports 0 and 1, further determined by FXSDA, FXSDB
Note: The above strap details describe the LAN9353 function. This EVB does not
support SFF Fiber Mode. Therefore, FX-SD related straps are not applica-
ble.
Table 3-23 describes the different LED references and their corresponding colors and
indications
TABLE 3-23: LEDS
Reference
Color
D1
Green
D2
Red
D4
Green
D7
Green
Indication
3.3V Power active
LAN9353 is in reset condition
Full-duplex / Collision Port 1
Full-duplex / Collision Port 2
Note: Assumes the LED_FUN field of the LED_CFG register is 00b.
DS50002393A-page 26
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