EVB8187 Standard Microsystems (SMSC), EVB8187 Datasheet - Page 4

• Manufacturer Part Number: EVB8187
• Manufacturer: Standard Microsystems (SMSC)

Specifications of EVB8187

• Lead Free Status / Rohs Status: Supplier Unconfirmed

SPEED100PHYAD0LSB PHYAD0 = 1
LINKPHYAD1
ACTPHYAD2
FDUPLEXPHYAD3 PHYAD3=1
GPO1PHYAD4
Revision 0.7 (12-8-06)
2.2.1
NAME
PHY Address and LEDs
Resistors R24, R31, R37, R29, R38, R34, R35, R32, R36, R33, R27, R28, R25, and R26 are used to
set the PHY address according to the table below.
The address lines are strapped as defined in the diagram below. The LED outputs will automatically
change polarity based on the presence of an external pull-down resistor.
To set the PHY address on the LED pins without LEDs or on the CRS/PHYAD4 pin, float the pin to
set the address high or pull-down the pin with an external 10K resistor to GND to set the address low.
See the
LSB PHYAD0 = 0
PHYAD1=1
PHYAD1=0
PHYAD2=1
PHYAD2=0
PHYAD3=0
MSB PHYAD4=1
MSB PHYAD4=0
active low.
n
active high.
PHY ADDRESS
n
If the LED pin is pulled low, by an external 10K pull-down resistor, then the LED output will be
If the LED pin is pulled high, by the internal 100K pull-up resistor, then the LED output will be
Figure 2
Figure 2 PHY Address Strapping with the LED pins.
below:
Table 2 PHY address and LED configuration
DEFAULTACTIVE LOW
DEFAULTACTIVE LOW
DEFAULTACTIVE LOW
DEFAULTACTIVE LOW
DEFAULTACTIVE LOW
LED OUTPUT
ACTIVE HIGH
ACTIVE HIGH
ACTIVE HIGH
ACTIVE HIGH
ACTIVE HIGH
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4
Populate R24 Depopulate R31 LED2 orient up
Populate R31 Depopulate R24 LED2 orient down
Populate R37 Populate R29 Depopulate R38 Depopulate R34
Populate R38 Populate R34 Depopulate R37 Depopulate R29
Populate R35 Populate R32 Depopulate R36 Depopulate R33
Populate R36 Populate R33 Depopulate R35 Depopulate R32
Populate R27 Depopulate R28 LED3 orient up
Populate R28 Depopulate R27 LED3 orient down
Populate R25 Depopulate R26 LED1 orient up
Populate R26 Depopulate R25 LED1 orient down
DESCRIPTION
EVB8187 User Manual
SMSC EVB8187