User guide

Figure 3–1 Controls and Indicators

2 3 4

MLO-013262

Table 3–1 Controls and Indicators

Control or Indicator Description

Reset/Halt switch A switch that resets the Digital Alpha VME 4

system when pressed in the Reset (up) direction.

When pressed in the Halt (down) direction this

switch halts the operating system and the module

enters console mode.

Status display A display that shows which test is running during

the POST. After that, the display is under the

software control of the operating system or an

application program.

VME Slave Activity

/Watchdog Timeout LED

An amber LED with two functions. The LED

ﬂashes when the Digital Alpha VME 4 module

is accessed as a slave by another device on the

VMEbus. The LED lights continuously when the

watchdog timer has timed out.

Note: The LED can appear to light continuously

when the module is receiving slave accesses. Since

the LED glows for 1/3 of a second each time it

ﬂashes, three slave accesses per second could make

the LED light continuously.

Power LED A green LED that is lit when the power is on.

3–2 Operating the Digital Alpha VME 4 Computer