UMAC-CPCI Turbo CPU Board Hardware Reference Manual
Jumper Descriptions
13
E18A, B, C, D: Ethernet Communication Control
E Point & Physical
Layout
Location Description Default
Jump 1 to 2 to Ethernet Connection to J7 front connector
Jump 2-3 for Ethernet connection through back J2 connector
Pins 1-2
jumpered
E19: Watchdog Disable Jumper
E Point & Physical
Layout
Location Description Default
Jump pin 1 to 2 to disable Watchdog timer (for test purposes
only.).
Remove jumper to enable Watchdog timer.
No jumper
installed
E20 – E22: Power-Up/Reset Load Source
E Point &
Physical Layout
Location Description Default
E20:
To load active memory from flash IC on power-up/reset,
Remove jumper E20;
Jump E21 pin 1 to 2;
Jump E22 pin 1 to 2.
Other combinations are for factory use only; the board will not
operate in any other configuration.
No E20 jumper
installed
E21 and E22
jump pin 1 to 2
E23: Firmware Reload Enable
E Point &
Physical Layout
Location Description Default
Jump pin 1 to 2 to reload firmware through serial or host bus port.
Remove jumper for normal operations.
No jumper
installed
E25A, B, C: Flash Memory Firmware Bank Select
E Point &
Physical Layout
Location Description Default
Remove all jumpers to select standard factory-installed bank of
operational firmware.
Install one or more jumper(s) to select alternate bank of operation
firmware to install (E23 ON) or use (E23 OFF).
No jumpers
installed
E18D
1
E18C
1
E18B
1
