Specifications

Theory of Operation

4 4

4-11

TEST This LED is lit whenever the system is running its power-on

self-test, as reflected in the PASS bit in the VXI registers. If PASS

is 0, then this LED is lit. This only occurs during a hardware reset.

Resetting the EPC-8

There are a number of ways to reset (reboot) the EPC-8.

Power-off, Power-on

Known as a cold hardware reset. This causes all boards in the VMEbus to

reset. The system runs the power-on self-tests and reboots the OS.

Power low

‘‘Warm’’ hardware reset. When power is detected between ~3.0 and ~4.5V,

the system runs the Power On Self Test (POST) and reboots the operating

system. When power is less than ~3.0V, the system performs a cold hardware

reset.

Front-panel Reset button

‘‘Warm’’ hardware reset. The Reset button causes the EPC-8 to perform a

hardware reset. The system runs the power-on self-tests and reboots the

operating system.

Ctrl+Alt+Del

‘‘Warm’’ software reset. This keyboard sequence is also called a "warm

boot". The EPC-8 does not reinitialize all of the processor's hardware. The

power-on self-test does not run. However, the operating system is reloaded.

VMEbus SysReset

‘‘Warm’’ hardware reset. The EPC-8 can be software-configured to respond

or not respond to the VMEbus SYSRESET* line. Asserting bit 7(SRIE) of

reset semantics are the same as the front panel reset.

Watchdog Timer

‘‘Warm’’ hardware reset. Same as a front panel reset button except that

SYSFAIL is asserted until the watchdog timer is cleared.

Resets are summarized in the table below.

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