INDUSTRIAL I/O PACK SERIES
AVME9675A
VMEx64 bus 6U CARRIER BOARD
Acromag, Inc. Tel: 248-295-0310
- 27 -
http://www.acromag.com
- 27 -
https://ww.acromag.com
MSB
D7
D6
D5
D4
D3
D2
D1
LSB
D0
ACE
1
AAD
2
TOA
3
Soft
Reset
GIE
4
GlP
5
Not
Used
Not
Used
Notes:
1.
ACE
–
this bit is Auto Clear Interrupt Enable.
2.
AAD - this bit is Auto Acknowledge Disable.
3.
TOA - this bit is Time Out Access Enable.
4.
GIE - this bit is Global Interrupt Enable.
5.
GIP - this bit is Global Interrupt Pending.
Bits 1, 0
Not used - equal "0" if read
Bit 7
Writing a “1” to this bi
t will enable automatic clear of pending interrupts on
the carrier. When this bit is set, pending interrupts will not be latched or
registered on the carrier. An interrupt will only remain set as pending on
the carrier if its corresponding IP module has an active interrupt request.
Bit 6
Auto Acknowledge Disable
When this bit is set to “1” automatic acknowledge of the IP module access is
disabled. Thus, an access to an empty IP module slot can result in a bus
error due to time out. When this bit is set
to “0” automatic
acknowledgement is enabled. The carrier will acknowledge the access even
if the IP module does not or if there is no IP module present. Bit 5 of this
register will be set to indicate that the last IP module access has timed out.
Bit 5
Timed Out Access
Thi
s bit when set to “1” indicates that the last IP module has timed out (The
IP did not acknowledge the access.) This bit will be “0” on power
-up.
Reading the carrier board status register will clear this bit to “0”.
Bit 4
Software Reset (Write)
Writing a "1" to this bit causes a software reset. Writing "0" or reading the
bit has no effect. When set the software reset bit will have a duration of
1us. The effect of software reset on the various registers is noted in the
description of each register.
Reset Condition: Set to "0".
Bit 3
Global Interrupt
Enable (GIE)
(Read/Write)
Bit 2
Global Interrupt Pending (GIP)
Writing a "1" to this bit enables interrupts to be serviced, provided that
interrupts are supported and configured. A "0" disables servicing interrupts.
Reset Condition: Set to "0", interrupts disabled.
This bit will be "1" when there is an interrupt pending. This bit will be "0"
when there is no interrupt pending. Polling this bit will reflect the board's