KSZ9031RNX-EVAL Board User’s Guide
Micrel, Inc.
August 17, 2012
Rev.
1.1
7/22
4.1 Jumper Setting & Definition
At power-up, the KSZ9031RNX device is configured via strapping pins that are set by external
pull-up and pull-down resistors. The KSZ9031RNX-EVAL board provides jumpers for the
KSZ9031RNX device strap-in settings and for selective board options.
Jumpers allow for quick configuration and re-configuration. To override the current KSZ9031RNX
device and board settings, simply select and close the desired jumper setting(s) and toggle the
on-board manual reset button (S1) for the new setting(s) to take effect.
The KSZ9031RNX-EVAL board jumper settings are defined in the table below.
Jumper
KSZ9031RNX Pin Name
Setting
Function
KSZ9031RNX Device Strapping Pins
Close pins (1, 2)
Set MODE3 = 1
JP1 MODE3
Close pins (2, 3)
Set MODE3 = 0
Close pins (1, 2)
Set MODE2 = 1
JP2 MODE2
Close pins (2, 3)
Set MODE2 = 0
Close pins (1, 2)
Set MODE1 = 1
JP3 MODE1
Close pins (2, 3)
Set MODE1 = 0
Close pins (1, 2)
Set MODE0 = 1
JP4 MODE0
Close pins (2, 3)
Set MODE0 = 0
Close pins (1, 2)
Set PHYAD2 = 1
JP19 PHYAD2
Close pins (2, 3)
Set PHYAD2 = 0
Close pins (1, 2)
Set PHYAD1 = 1
JP9 PHYAD1
Close pins (2, 3)
Set PHYAD1 = 0
Close pins (1, 2)
Set PHYAD0 = 1
JP10 PHYAD0
Close pins (2, 3)
Set PHYAD0 = 0
Close pins (1, 2)
Enable 125 MHz Clock Output
JP16 CLK125_EN
Close pins (2, 3)
Disable 125 MHz Clock Output
Close pins (1, 2)
Select Single LED Mode
JP20 LED_MODE
Close pins (2, 3)
Select Tri-color Dual LED Mode
KSZ9031RNX-EVAL Board Settings
Close pins (1, 2)
Use for Single LED Mode
JP26 LED2
Close pins (2, 3)
Use for Tri-color Dual LED Mode
Close pins (1, 2)
Use for Single LED Mode
JP27 LED1
Close pins (2, 3)
Use for Tri-color Dual LED Mode
Close pins (1, 2)
Select 2.5V for KSZ903RNX digital I/Os
JP23 DVDDH
Close pins (2, 3)
Select 3.3V for KSZ9031RNX digital I/Os
Close Jumper
Close MDC signal to USB Controller (U8)
JP21
1
MDC
Open Jumper
Open MDC signal to USB Controller (U8)
Close Jumper
Close MDIO signal to USB Controller (U8)
JP22
1
MDIO
Open Jumper
Open MDIO signal to USB Controller (U8)
Note:
1
JP21 and JP22 connect the MDC/MDIO signals to U8 when U13 is not populated.
Table 1. KSZ9031RNX-EVAL Board – Jumper Definition
