XVME-2 12 Manual
August, 1989
3.5.1
Extended Status and Status/Control Register Bit Definitions
0 1.
Red LED.. Green LED
These bits control the red and green LEDs. The red and green LEDs provide
visual indication of a module status.
-
-
A logic “0” turns on the red LED (D0)
A logic “1” turns on the green LED (Dl)
The LEDs should be used to indicate the following status (Table 3-2) as set
forth by the Xycom architecture (described in Appendix A).
Table 3-2. LED Status
, Status Bits
1 0
0 0
0 1
1 0
1 1
LEDs
Green Red
O F F O N
O F F
OFF
ON ON
O N
OFF
SYSFAIL*
O N
O F F
O N
O F F
Status
Module failed, or not yet
tested
Inactive module
Module undergoing test
Module passed test
2
Note
The XVME-212 is a non-intelligent module, so all
diagnostics must be performed by the system host.
VMEbus Interrupt Pendinq
This read-only bit reads 1 whenever BOTH of the following conditions are
met:
One or more of the Change Register n Interrupt Enable bits (bits 4-7
of the Status/Control Register) has been set to 1.
AND
A bit in one of the interrupt-enabled Change Registers associated with
a port has the value 1. A bit value of 1 in a Change Register indicates
that a change of state has occurred on a specified input channel.
VMEbus Interrupt Enable
This bit enables VMEbus interrupts from the XVME-212 module:
1-
a VMEbus interrupt will be generated automatically whenever the
XVME-212 sets bit 2 to 1.
2- no VMEbus interrupt will be generated.
3-6
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