Reset Switch (S2) - Motorola MVME2603-1121A Installation And Use Manual

Operating Instructions
line IRQ8 ∗ . The signal is also available at pin PB7 of the Z8536 CIO
2
device, which handles various status signals, serial I/O lines, and
counters.
The interrupter connected to the switch is an edge-sensitive
ABORT
circuit, filtered to remove switch bounce.

RESET Switch (S2)

The switch resets all onboard devices; it also drives a
RESET
∗ signal if the MVME2603/2604 is the system controller.
SYSRESET
The Universe ASIC includes both a global and a local reset driver.
When the Universe operates as the VMEbus system controller, the
reset driver provides a global system reset by asserting the VMEbus
signal ∗ . A ∗ signal may be generated by the
SYSRESET SYSRESET
switch, a power-up reset, a watchdog timeout, or by a
RESET
control bit in the Miscellaneous Control Register (MISC_CTL) in the
Universe ASIC. ∗ remains asserted for at least 200 ms, as
SYSRESET
required by the VMEbus specification.
Similarly, the Universe ASIC supplies an input signal and a control
bit to initiate a local reset operation. By setting a control bit,
software can maintain a board in a reset state, disabling a faulty
board from participating in normal system operation. The local
reset driver is enabled even when the Universe ASIC is not system
controller. Local resets may be generated by the switch, a
RESET
power-up reset, a watchdog timeout, a VMEbus ∗ , or a
SYSRESET
control bit in the MISC_CTL register.
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