KSZ8795 Evaluation Board User’s Guide
Micrel Inc.
Page 7
1/28/2015
4.2 Feature Setting Jumpers
The evaluation board provides jumpers to allow the user to easily set strap in configurations for the
KSZ8795. Tables below describe the jumpers and their functions in the open or closed state.
Table 1 General Setting Jumpers
Jumper
KSZ8795 Signal
Description
Closed or Open
Description
Closed or Open
JP1 5-pin
SPI signals
Open for SPI signals
N/A
JP2 3-pin
SCL_MDC
1-2 for KSZ8795 SPI or
2-3 for KSZ9031 GPHY MDC
JP3 3-pin
SDA_MDIO
1-2 for KSZ8795 SPI or
2-3 for KSZ9031 GPHY MDIO
JP4/JP5
Port 1 POE PSE
Open: Don’t provide POE
PSE power for port 1
Closed: Provide POE PSE
power for port 1
JP6/JP7
Port 2 POE PSE
Open: Don’t provide POE
PSE power for port 2
Closed: Provide POE PSE
power for port 2
JP8/JP9
Port 3 POE PSE
Open: Don’t provide POE
PSE power for port 3
Closed: Provide POE PSE
power for port 3
JP10/JP11
Port 4 POE PSE
Open: Don’t provide POE
PSE power for port 4
Closed: Provide POE PSE
power for port 4
JP38
PGOOD Status
Open: Default
N/A
JP40
Enable POE PSE
power regulator
Open: Enabled as default
Closed: Disabled
JP42
Select POE PSE
output voltage
1-2: About 3.3V (it is not
recommended)
2-3: About 7V (default)
JP25
Push button reset
with KSZ9031
GPHY
Open: Doesn’t reset
KSZ9031 GPHY
Closed: Push button reset
including KSZ9031 GPHY
Table 2 Power Setting Jumpers
Jumper
Description
Description
Closed or Open
Description
Closed or Open
JP37 3-pin
VDDIO voltage
selection
1-2 Closed: 3.3V VDDIO
(default)
2-3 Closed: 2.5V VDDIO
