Board Details & Configuration
2014 Microchip Technology Inc.
Preliminary
DS50002332A-page 17
2.4.1.3.3
FX-LOS Fiber Mode Strap
FX-LOS strap details are shown in Table 2-8. These strap settings determine if the
ports are to operate in FX-LOS Fiber Mode or FX-SD/Copper Mode.
2.4.2
LED Indicators
The D3 and D4 LEDs are used to indicate the Link/Activity status on the corresponding
EVB ports, as detailed in Table 2-9. The Link/Act LED should be ON at each port when
the cable is present. If the Link/Act LED is not ON, it indicates there is an issue with the
connection or cable.
Additionally, the D5 LED is used as a RUN indicator (green) to shows the AL status of
the EtherCAT® State Machine (ESM), as detailed in Table 2-10.
TABLE 2-8:
FX-LOS MODE STRAP SETTINGS
R77 (10K)
R79 (10K)
Reference
Voltage (V)
Function
Populate
DNP
3.3
A level above 2V selects FX-LOS for Port 0 and
Port 1
Populate
Populate
1.5
A level of 1.5V selects FX-LOS for Port 0 and
FX-SD / copper twisted pair for Port 1, further
determined by FXSDB
DNP
Populate
0 (Default)
A level of 0V selects FX-SD / copper twisted pair
for Ports 0 and 1, further determined by FXSDA
and FXSDB
Note:
The above strap details describe the LAN9252 function. This EVB does not
support SFF Fiber Mode. Therefore, FX-SD related straps are not applica-
ble.
TABLE 2-9:
D3 AND D4 LINK/ACTIVITY LED STATUS INDICATORS
State
Description
Off
Link is down
Flashing Green
Link is up with activity
Steady Green
Link is up with no activity
TABLE 2-10:
D5 RUN LED STATUS INDICATOR
State
Description
Off
The device is in the INITIALIZATION state
Blinking (on 200ms, off 200ms)
The device is in the PRE-OPERATIONAL state
Single Flash (on 200ms, off 1000ms)
The device is in the SAFE-OPERATIONAL state
On
The device is in the OPERATIONAL state
Flickering (on 50ms, off 50ms)
The device is booting and has not yet entered
the INITIALIZATION state, or the device is in the
BOOTSTRAP state and firmware download is in
progress. (Optional. Off when not implemented.)
