user manual

Functional Description
2-11
2
Front Panel Switches and LEDs
There are two switches and eight LEDs on the boardÕs front panel
(refer to Table 2-3, Table 2-4, and Figure 3-1 on page 3-6).
Table 2-3. Front Panel Switches
Switch
Name
Description
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.
Table 2-4. Front Panel LEDs
LED
Name
Color Description
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).