Vmebus Hi Address - Xycom XVME-678 Manual

XVME-678/688 Manual
July 1994
4.6.4 Status Register 2 (STATUS2, Port Address 33H)
The bits of this read-only port are described below.
00-03 are reserved, read-only, and set to 0
04 indicates whether the VMEbus requester has ownership of the VMEbus
o
=
yes
1
=
no
05 defines the status of the VMEbus signal SYSF AIL
o
=
asserted
1
=
not asserted
06,07 are reserved, read-only, and set to 1
4.6.5 VMEbus
m
Address (VME_HI_AOO, Port Address 34H)
This read/write port is used to provide the upper 8 address bits (A16-A23) when the VMEbus Standard
address space is accessed through the Real Mode Window (refer to section 4.3.4).
4.6.6 Control Register 2 (CONREG2, Port Address 36H)
This register is used to control the AM2 bit for VME accesses and the ROM DOS boot option.
DO is reserved, read-only, and set to 0
01 gives the AM2 setting on VMEbus access
o
=
set to 0 (non-privileged)
1
=
set to 1 (supervisory)
03-07 are reserved, read-only, and set to 0
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