Specifications

EPC-2 HARDWARE REFERENCE
switch or keyboard does not cause the EPC-2 to assert SYSRESET. The EPC-2 con-
tains, however, a software-controllable register bit to allow software to assert SYS-
RESET.
Responding to VXIbus SYSRESET
A software-controllable register bit in the EPC-2 controls whether or not a hardware
reset of the EPC-2 occurs when the VXIbus SYSRESET signal is asserted.
Front Panel Indicators
The EPC-2 contains the following three LEDs:
Run This green LED should flicker during BIOS initialization and be lit thereafter.
It denotes that the 386 is performing a DRAM access. If the LED is off, the
most probable causes are (1) a "hung" condition has occurred in the operating-
system or application software and (2) a VXIbus access is being attempted but
the EPC-2 has not received a bus-grant signal. In the latter case, the usual rea-
sons are an error in setting the jumpers on the VXIbus backplane, not being
fully seated in the backplane, or a failure in the slot-0 system controller mod-
ule.
Fail This red LED can light only if the EPC-2 is configured as the VXIbus system
controller. If lit, it indicates that some module is driving the VXIbus SYSFAIL
line.
Test This software-controllable yellow LED is used by the BIOS. It is lit whenever
the BIOS is performing a hardware selftest, and is extinguished if and when the
selftest is successful. It is possible for application software to use this LED for
other purposes.
BIOS Screen Display
Whenever the EPC-2 is reset, information is displayed on the attached monitor showing
the status of the BIOS selftest and the amount of memory found. If everything proceeds
normally, the screen image should appear approximately as shown in the following
figure.
Page 14
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com