Xycom XVME-678 Manual page 93

4.6.9 Control Register 5 (CONREG5, Port Address 30H)
XVME-678/688 Manual
July 1994
This control register is used to enable Auxiliary Non maskable interrupts. If the auxiliary NMIs are
mapped onto IRQ1O, then enable bits 0-2 become the clearing mechanism for the interrupt.
DO
determines whether local bus error causes NMI
o
=
does not cause NMI
1
=
causes NMI
01 determines whether VMESYSFAIL causes NMI
o
=
does not cause NMI
1
=
causes NMI
02 determines whether ABORT switch causes NMI
o
=
does not cause NMI
1
=
causes NMI
03-07 are reserved, read-only, and set to 0
4.6.10 Control Register 6 (CONREG6, Port Address 3FH)
Control Register 6 is used to set the bus request and acknowledge level and to offer a Release on Request
(ROR) option. When the system resource switch is in the on position, bus request level 3 is chosen
regardless of the bit pattern in DO and 01.
00,01 choose the bus request level
DO Dl
o
0 Level 3
1 0 Level 2
o
1 Level 1
1 1 Level 0
02 selects type of release
o
=
Normal release
1
=
Release on request
03 is a read-only bit that reflects the position of the system resource switch
o
=
not system resources
1
=
system resources
D4-D7 are reserved, read-only, and set to 0
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