Motorola MVME2700 Series Service Manual download pdf (Page 86)

2-2 Computer Group Literature Center Web Site

Operating Instructions

Figure 2-1. PPCBug Firmware System Startup

ABORT Switch (S1)

The

ABORT switch sends an interrupt signal to the processor. The interrupt

is normally used to abort program execution and return control to the

debugger firmware located in the MVME2700 EPROM and Flash

memory.

The interrupter connected to the

ABORT switch is an edge-sensitive circuit,

filtered to remove switch bounce.

RESET Switch (S2)

The

RESET switch resets all onboard devices; it also drives a SYSRESET∗

signal if the MVME2700 is the system controller.

SYSRESET∗ signals may

be generated by the

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

or by a control bit in the Miscellaneous Control Register (MISC_CTL) in

the Universe II ASIC. For further details, refer to RESET Switch (S2) on

page 3-19.

11734.00 9702

STARTUP

SYSTEM

INITIALIZATION

CONSOLE

DETECTION

OPERATING

SYSTEM

STARTUP SCRIPT

EXECUTION

(IF ENABLED)

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Motorola MVME2700 Series Service Manual Page 86