Motorola MVME2600 Series User Manual download pdf (Page 40)

100

101

Restarting the System

1-22

SYSFAIL* Assertion and Negation (MVME230

, MVME260

, MVME360

, and

MVME460

)

On VMEbus boards, the board fail is the same as the SYSFAIL

indicator. At reset or power-up, the debugger asserts the VMEbus

SYSFAIL* line (refer to the VMEbus specification).

The SYSFAIL* line is negated if debugger initialization is done and

if none of the board failure conditions have occurred. However,

SYSFAIL* stays asserted if any of the board failure conditions have

occurred. In this way, the state of the debugger is indicated to the

user or VMEbus masters. In a multi-computer configuration, other

VMEbus masters could view the pertinent control and status

registers to determine which CPU is asserting SYSFAIL* in the

event of a board failure.

SYSFAIL* assertion and negation is also affected by the

ENV

command (refer to the ENV command in Chapter 3).

Notes Assert indicates a signal is active or true. Negate

indicates a signal is inactive or false. These terms are

used independently of the voltage levels (high or low)

that they represent.

The asterisk (*) in the signal name SYSFAIL* denotes

that the signal is true or valid when the it is low

(SYSFAIL* is level sensitive).

MPU Clock Speed Calculation

The MPU clock speed is calculated and checked against the MPU

clock speed parameter located in NVRAM, which you may set in

the

CNFG command. If the check fails, a warning message is

displayed. The calculated clock speed is also checked against

known clock speeds and tolerances.

Refer to Chapter 3 for information on setting the CNFG command

parameters.

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Motorola MVME2600 Series User Manual Page 40

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