Avics Application Notes; Local Interrupts; Example; Table 25: Recommended Interrupt Assignments - Performance Computer PT-VME161 User Manual

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Section APPENDICES
APPENDIX J: SCV64 Application Notes

Local Interrupts

Registers 0h, 8h-Fh (except Ch) of the SCV64 control the masking, level mapping, vector options and
show the status of the six general purpose local interrupts (LIRQ0-LIRQ5) and the five local interrupts
dedicated to level 7 (L7I0-L7I3, BI-mode). All of the general interrupts and four of the level 7 (all except
L7I0) interrupts can be masked. All interrupts are autovectored, except for LIRQ4 and LIRQ5 which can
be programmed to be vectored or autovectored.

Example:

The following interrupt assignments are recommended for a PT-VME161 board:
* Note: Items marked by an asterisk cannot be changed by software.
The following steps enable the interrupts according to the above table (all registers are located on the
SCV64):
Step 1
Step 2
Step 3
Step 4
Step 5
104 Extensible Single Board Computer/Controller User's Manual

Table 25: Recommended Interrupt Assignments

Signal Source*
SCV64 Location Monitor
SCV64 VMEbus Events
SCV64 Tick Timer
E-PAK EPIRQ & 33C93A
E-PAK EPVIR
68681 DUART
Abort Switch
SCSIbus Reset
VMEbus ACFAIL
VMEbus SYSFAIL
Write 1Fh to the SCV64 Level 7 Interrupt Enable Register to enable the level 7 interrupts.
Write 3Fh to SCV64 Local Interrupt Enable Register to enable the general interrupts.
Write 13h to SCV64 Local Interrupts 1 and 0 Control Register to map LIRQ0 to level 3 and
LIRQ1 to level 1.
Write 45h to SCV64 Local Interrupts 3 and 2 Control Register to map LIRQ2 to level 5 and
LIRQ3 to level 4.
Write 62h to SCV64 Local Interrupts 5 and 4 Control Register to map LIRQ4 to level 2,
vectored and LIRQ5 to level 6, vectored.
SCV64 Pin* AVEC/VEC
LIRQ0
LIRQ1
LIRQ2
LIRQ3
LIRQ4
LIRQ5
L7I0 (NMI) AVEC*
L7I1 (MEM) AVEC*
L7I2 (ACF) AVEC*
L7I3 (SYF) AVEC*
Level
AVEC 3
AVEC 1
AVEC 5
AVEC 4
VEC 2
VEC 6
7*
7*
7*
7*