TOWER SYSTEM
Jumper
Option
Setting
Description
SW1
RCON Settings
DIP 1
FB_AD0
*On*
Boot from NAND Flash
Off
Boot from External Memory Bus (Flexbus)
DIP 2
FB_AD1
*On*
PLL Disabled
Off
PLL Enabled
DIP 3
FB_AD2
*On*
Crystal Oscillator Mode
Off
Oscillator Bypass Mode
DIP 4
FB_AD3
*On*
External Memory Bus implements select as FB_ALE
Off
External Memory Bus implements select as FB_TS_b
DIP 5/6
FB_AD[5:4]
On/On
Boot Port Size: 32-bit data (32-bit muxed address)
On/Off
Boot Port Size: 8-bit (24-bit non-muxed address)
*Off/xx*
Boot Port Size: 16-bit (16-bit non-muxed address)
DIP 7/8
FB_AD[3:2]
*On/On*
PLL Multiplier: Fvco = 10 x Fref
On/Off
PLL Multiplier: Fvco = 15 x Fref
Off/On
PLL Multiplier: Fvco = 16 x Fref
Off/Off
PLL Multiplier: Fvco = 20 x Fref
J2
Clock Select
*1-2*
Select external clock source (Required for RMII)
2-3
Select on-board 25 MHz clock source
TWR-MCF5441X Jumper Options
The following is a list of all the jumper options. The
*default*
installed jumper settings are shown in bold
with asterisks.