INDUSTRIAL I/O PACK SERIES AVME9675 VME64x 6U CARRIER BOARD
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interrupt is recognized by the carrier board and is recorded in the
carrier board’s Interrupt Pending Register.
A carrier board pending interrupt will cause the board to release
the interrupt to the VME64x bus provided the Global Interrupt Enable
bit of the carrier’s Status Register has been enabled (see section 3
for programming details).
The carrier board releases the interrupt to the VME64x bus by
asserting the interrupt request level as pre-programmed in the
carrier’s Interrupt Level Register. The carrier board’s interrupt logic
then monitors the VME64x bus Interrupt Acknowledge Input
(IACKIN*) signal.
An active IACKIN* signal, detected by the carrier board, is either
passed to Interrupt Acknowledge Output (IACKOUT*) or consumed
by the carrier board. IACKIN* is passed to IACKOUT* if the
VME64x bus interrupt level does not match that programmed into
the carrier’s Interrupt Level Register. If a match is detected, the
carrier board responds to the interrupt by consuming IACKIN*.
The carrier board also responds to an interrupt by driving IP
Interrupt Select (INTSEL*) active to the IP that generated the
interrupt, provided only one interrupt has been issued. If two or
more interrupts occur at the same time, then INTSEL* is driven
active to the IP with the highest priority. The carrier board will
prioritize the requests based on the last interrupt serviced. The last
interrupt serviced will be given the lowest priority. See section 3 for
more detail. The IP module responds by placing the interrupt vector
on the data bus and asserts ACK*. The carrier then asserts
DTACK* active, and the VME64x bus master responds by executing
the code at the address of the interrupt vector.
The user written interrupt routine should include code to clear
the carrier board’s pending interrupt via the carrier’s Interrupt Clear
Register (see section 3) since the interrupt release mechanism is
Release on Register Access (RORA) type. In addition, the IP
module may need similar attention (see your IP module
documentation).
Power Failure Monitor
The carrier board contains a 5 volts undervoltage monitoring
circuit which provides a reset to the IP modules when the 5 volt
power drops below 4.27 volts, typical / 4.15 volts minimum. This
circuitry is implemented per the Industrial I/O Pack specification.
Access LEDs and Pulse Stretcher Circuitry
An LED display and pulse stretcher circuit is dedicated to each
IP module for indication of a data transfer to/from the corresponding
IP module. An IP acknowledged data transfer activates the pulse
stretcher circuit. The pulse stretcher’s circuit is programmed to
illuminate the LED for a duration of 0.125 seconds, typical.
Power Supply Filters
Power line filters are dedicated to each IP module for filtering of
the +5, +12, and -12 volt supplies. The power line filters are a T
type filter circuit comprising ferrite bead inductors and a feed-thru
capacitor. The filters provide improved noise performance as is
required on precision analog IP modules. Specifically, the filters are
typically capable of over 40dB of insertion loss for undesirable noise
and oscillations in the 100MHz frequency range and over 20dB of
insertion loss for noise and oscillations in the 10MHz frequency
range.
Power Supply Fuses
Power line fuses are dedicated to each IP module for fusing of
the +5, +12, and -12 volt supplies. The +5 volt supply uses a 2 Amp
fuse and the +/- 12 volt supplies use a 1 Amp fuse. These fuses are
needed to protect the power suppy in the VME64x bus cage system.
5.0 SERVICE AND REPAIR
SERVICE AND REPAIR ASSISTANCE
Surface-Mounted Technology (SMT) boards are generally
difficult to repair. It is highly recommended that a non-functioning
board be returned to Acromag for repair. The board can be
damaged unless special SMT repair and service tools are used.
Further, Acromag has automated test equipment that thoroughly
checks the performance of each board. When a board is first
produced and when any repair is made, it is tested, placed in a burn-
in room at elevated temperature, and retested before shipment.
Please refer to Acromag's Service Policy Bulletin or contact
Acromag for complete details on how to obtain parts and repair.
PRELIMINARY SERVICE PROCEDURE
Before beginning repair, be sure that all of the procedures in
Section 2, Preparation For Use, have been followed. Also, refer to
the documentation of your IP module to verify that it is correctly
configured. Replacement of the carrier and/or IP with one that is
known to work correctly is a good technique to isolate a faulty board.
In order to perform accesses to the carrier and IP module in the
A16 short space, the A16 base address must be configured first
within the CR/CSR space, and the module enabled. The CR/CSR
space’s base address is derived from geographical addressing
signals supplied by the VME64x backplane. If there is a problem
with the geographical addressing signals, the carrier should detect
“bad parity”. In this case, the CR/CSR base address will be set to
decimal 30 (0x1E) as recommended by the VME64x standard.
CAUTION: POWER MUST BE TURNED OFF BEFORE
REMOVING OR INSERTING BOARDS
Acromag’s Applications Engineers can provide further technical
assistance if required. When needed, complete repair services are
also available from Acromag.
6.0 SPECIFICATIONS
PHYSICAL
Physical Configuration....................... AVME9675 (6U)
Length......................................... 9.187 inches (233.3 mm)
Width.......................................... 6.299 inches (160.0 mm)
Board Thickness......................... 0.062 inches (1.59 mm)
Max Component Height............... 0.550 inches (13.97 mm)
Recommended Card Spacing..... 0.800 inches, (20.32mm)
Connectors:
P1 & P2 (VME64x bus).............. DIN 41612 160-pin Type C,
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