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EPC-6A Hardware Reference
System Reset
The reset switch performs a hardware reset of the EPC-6A and any EXM module, and
then invokes the BIOS initialization process discussed in the previous sections. Removing
and reapplying power to the EPC-6A also causes a hardware reset. Note that if the dot, or
decimal point, in the lower right corner of the 7-segment LED display is illuminated, an
EPC-6A program disabled the reset toggle switch. To reset the EPC-6A in this case, you
must externally signal the VMEbus SYSRESET (unless the EPC-6A program has disabled
this also) or by a power-off/on cycle.
Generating VMEbus SYSRESET
Upon power on, the EPC-6A drives the VMEbus SYSRESET signal in accordance with
the VMEbus specification. Resetting the EPC-6A via the reset switch does not cause the
EPC-6A to assert SYSRESET. The EPC-6A does contain a software-controllable register
bit to allow software to assert SYSRESET.
Responding to VMEbus SYSRESET
A software-controllable register bit in the EPC-6A controls whether or not a hardware
reset of the EPC-6A occurs when the VMEbus SYSRESET signal is asserted.
Front Panel Indicators
The front panel contains a seven-segment LED display. The front-panel display has these
purposes:
1. During BIOS initialization it describes the current stage of the initialization. If a test
fails in the selftest phase, it displays a code indicating the test that caused the BIOS to
abort the normal initialization flow. These codes are described in Chapter 6, Error
Messages.
2. After initialization, the display is available for use by the application program.
3. The display shows whether software disabled the reset function of the front-panel
switch. If the decimal point in the lower right corner of the display is lit, the reset
function of the switch is disabled.
The EPC-6A also contains the following LEDs:
•
RUN
•
SYSFAIL
•
MASTER
•
SLAVE
For detailed information about the LEDs, see Front Panel LEDs on page 45.
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