Motorola MVME187 User Manual

Functional Description

2-11

There are two switches and eight LEDs on the boardÕs front panel 
(refer to 

, 

, and 

RESET

The 

RESET

 switch resets all onboard devices and drives SYSRESET* if the 

board is system controller. The 

RESET

 switch may be disabled by software. 

ABORT

When enabled by software, the 

ABORT

 switch generates an interrupt at a user-

programmable level. It is normally used to abort program execution and 
return to the debugger. 

FAIL

Red

The 

FAIL

 LED lights when the BRDFAIL signal line is active. 

STAT

Yellow The 

STAT

 LED is controlled by software on the MVME187. 

RUN

Green

The 

RUN

 LED lights when the local bus TIP* signal line is low. This 

indicates one of the local bus masters is executing a local bus cycle. 

SCON

Green

The 

SCON

 LED lights when the MVME187 is the VMEbus system 

controller. 

LAN

Green The 

LAN

 LED lights when the LAN chip is local bus master. 

+12V

Green

The 

+12V

 LED lights when +12V power is available to the Ethernet 

transceiver interface. 

SCSI

Green The 

SCSI

 LED lights when the SCSI chip is local bus master. 

VME

Green

The 

VME

 LED lights when the board is using the VMEbus (VMEbus 

AS* is asserted by the VMEchip2) or when the board is accessed by 
the VMEbus (VMEchip2 is the local bus master).