Motorola MVME2700 Series Servisní příručka stáhnout pdf (Strana 117)

Block Diagram

http://www.motorola.com/computer/literature 3-19

The interrupter connected to the ABORT switch is an edge-sensitive circuit,

filtered to remove switch bounce.

RESET Switch (S2)

The RESET switch is located on the LED mezzanine. The RESET switch

resets all onboard devices; it also drives a

SYSRESET∗ signal if the

MVME2700 is the system controller.

The Universe II ASIC includes both a global and a local reset driver. When

the Universe II operates as the VMEbus system controller, the reset driver

provides a global system reset by asserting the VMEbus signal

SYSRESET∗.

SYSRESET∗ signal may be generated by the RESET switch, a power-up

reset, a watchdog timeout, or by a control bit in the Miscellaneous Control

SYSRESET∗ remains

asserted for at least 200 ms, as required by the VMEbus specification.

Similarly, the Universe II 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 II ASIC is not system controller. Local resets may be

generated by the

RESET switch, a power-up reset, a watchdog timeout, a

VMEbus

SYSRESET∗, or a control bit in the MISC_CTL register.

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Motorola MVME2700 Series Servisní příručka Strana 117