Category: SBS

Interrupts are fully supported with a simple but powerful architecture.  Each of the four IPs is able to

generate up to two interrupt requests.  These eight request lines are paired with the seven available

VMEbus

interrupt request levels by a simple jumper block.  Alternatively, a user provided PLD may be installed to

perform arbitrarily complex interrupt mappings.

Front panel IP access acknowledge (ACK) and power check LEDs are provided for visual verification. Two

power check circuits detect blown fuses and line faults on any IP slot. The VIPC616 provides fuse

protection,

RF filtering and de-coupling capacitance on all IP power lines.

Features

• Four IndustryPacks slots on a 6U VME board

• Supports I/O, ID, memory, and interrupt cycles

• Front panel I/O through unshielded right-angle ribbon connectors

• 64 lines of backpanel I/O via P2

• A24 and A32 memory maps available

• Up to 8 Mbytes of memory per slot

• Front panel activity LEDs for each IndustryPack slot

• Front panel power monitor LEDs

• Filtered and fused power rails

• Custom IRQ mapping available via PLD programming

• 100% software compatible with the VIPC618

Application Information

The VIPC616 VMEbus IndustryPack carrier is part of the IndustryPack family of modular I/O components.

As a 6U carier board, the VIPC616  provides mechanical mounting and the electrical interface from the VME

backplane to four single-wide IndustryPacks or up to two double-wide IndustryPacks. The carrier supports

I/O, ID, memory, and interrupt functions.

The popular VIPC616 is a basic version of the enhanced VIPC618. The VIPC618 uses shielded 50-pin

subminiature D connectors as the front panel I/O interface for significant reduction of EMI emissions and

include latches. The VIPC616 features right-angled ribbon cable connectors on its front panel.

In addition to the front panel cabling, most of the I/O signals of the C and D IndustryPacks are also routed

to the VMEbus P2 backplane connector.  This permits more flexible cabling options in many chassis.

IndustryPack I/O is mapped into the VMEbus A16/D16 space.  Both user and supervisor accesses are

supported, as are read-modify-write (“test and set”) operations.  The size of I/O and ID spaces on each IP is

fixed by the IndustryPack Specification. Memory is mapped into either A24 or A32 space. The A32 selection

supports the full 8 Mbytes of memory per IndustryPAck slot.

Product Description 

IP-Quadrature provides high density, cost-effective flexible implementation of four quadrature decoder channels. Channels may also be used as general purpose counters. Four independent channels provide 24-bit resolution, programmable modes, programmable polarity, interrupt capability, differential or single-ended (RS-422 or TTL/CMOS) input, read-on-the-fly capability, and a count frequency of 0 to 10 MHz. 

Quadrature encoders are popular sensors that provide accurate, low cost incremental motion sensing. Most commonly, they are shaft encoders that provide 512 to 2048 counts per revolution. 

They are also commonly used as linear encoders with resolutions down to 0.005 inch. They are available in nearly any length desired. Most encoders are now optical, using molded assemblies consisting of a pair of LEDs, lenses, photo-sensors, and simple electronics. For rotary motion the assembly senses alternating opaque and clear lines on a rotating wheel. For linear motion the alternating lines may be on a fixed bar and the sensor assembly moves, or vice-versa. The pair of LED and photo-sensors are offset about one-half line width so that direction of motion may be sensed by observing the relative phase of the two outputs. Typical quadrature encoder outputs are a pair of digital logic signals that are nominally 90° out of phase. Some encoders also provide an 

“index” pulse output once per revolution to provide absolute position information. Most modern encoders run from +5 volts and provide CMOS/TTL logic outputs and/or RS-422 differential logic outputs. RS-422 is recommended where possible because of its inherent noise immunity and the ability to run long distances. TTL logic levels should normally be restricted to cables less than ten feet in length. Quadrature encoders are available from Hewlett-Packard, US digital, and other sources. 

The general purpose input structure permits differential input from line drivers (RS-422 levels) or single-ended logic level input (“TTL”) directly from most sensors. Programmable TTL resistive terminators provide for flexible high-quality signal termination.