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Configuration and functionality UM0819
17/37 Doc ID 16379 Rev 2
MII/RMII mode selection
A strapping option allows setting the operating mode of the MAC data interface. Default
operation (no pull-ups) enable normal MII mode of operation. Strapping CF0 high will cause
the device to be in RMII.
6.1.2 Solder bridges
The SB1 and SB2 solder bridges are used to connect 25MHz crystal X1 to the ST802RT1
TX mode PHY. They can be removed to disconnect the crystal when external clock signal on
test point MCO is used as the input clock.
6.1.3 RESET button
The RESET button resets the ST802RT1 TX mode PHY to its initial state.
6.1.4 LEDs
By default the LEDs have the following functionality:
Table 4. Loopback jumper setting
Jumper Description Default configuration
JP8
LPBK - loopback; “high” - internal loopback selected (mainly for
debug purposes); “low” - normal operation
Low
Table 5. MII/RMII jumper settings
Jumper Description Default configuration
JP9 CF0 - MAC data interface selection Low
JP10 CF1 - MAC data interface selection Low
Table 6. MII/RMII interface selection
CF0 (JP9) CF1 (JP10)
MII Low X
RMII High Low
Table 7. LEDs functionality - alternative 1
LED Description Details
LED1 BLINK for activity JP16 is low
LED2 BLINK for activity JP16 is high
LED3 ON for 100 Mb / OFF for 10 Mb JP17 is low
LED4 ON for 100 Mb / OFF for 10 Mb JP17 is high
LED5 ON for link up / OFF for link down JP18 is low
LED6 ON for link up / OFF for link down JP18 is high
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